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Habitat shift of adult Caligus undulatus (Copepoda: Siphonostomatoida: Caligidae) from host fish to plankton in response to host behavior Dis. Aquat. Org. (IF 1.4) Pub Date : 2024-03-14 Yusuke Kondo, Susumu Ohtsuka, Masaki Nawata, Yusuke Nishida, Sota Komeda, Sadaharu Iwasaki, Panakkool Thamban Aneesh, Balu Alagar Venmathi Maran
ABSTRACT: Before 2019, adults of the sea louse Caligus undulatus were reported exclusively in plankton from ocean samples worldwide and were not known to parasitize fish hosts. In 2019, the first instance of this caligid parasitizing a fish host, Japanese sardinella Sardinella zunasi, was reported in the Seto Inland Sea, Japan. The presently reported study aimed to investigate the biology and ecology
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Novel lambdapapillomavirus in northern sea otters Enhydra lutris kenyoni, associated with oral hyperplastic nodules Dis. Aquat. Org. (IF 1.4) Pub Date : 2024-02-29 Carlos H. Romero, Pam Tuomi, Kathleen A. Burek-Huntington, Verena A. Gill
ABSTRACT: A novel papillomavirus (PV) associated with hyperplastic nodules scattered over the muco-cutaneous border of the oral cavity of a dead, wild, subadult northern sea otter Enhydra lutris kenyoni (NSO) in 2004 in Homer, Alaska, USA, was genetically characterized. Primers for the amplification of 2 large overlapping DNA fragments that contained the complete genome of the NSO PV were designed
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Acipenserid herpesvirus 2 genome and partial validation of a qPCR for its detection in white sturgeon Acipenser transmontanus Dis. Aquat. Org. (IF 1.4) Pub Date : 2024-02-01 Eva Marie Quijano Cardé, Kelsey Anenson, Geoffrey Waldbieser, C. Titus Brown, Matt Griffin, Eileen Henderson, Susan Yun, Esteban Soto
ABSTRACT: White sturgeon Acipenser transmontanus is the primary species used for caviar and sturgeon meat production in the USA. An important pathogen of white sturgeon is acipenserid herpesvirus 2 (AciHV-2). In this study, 4 archived isolates from temporally discrete natural outbreaks spanning the past 30 yr were sequenced via Illumina and Oxford Nanopore Technologies platforms. Assemblies of approximately
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Erysipelas with preferential brain and skin involvement in a Mediterranean bottlenose dolphin Tursiops truncatus Dis. Aquat. Org. (IF 1.4) Pub Date : 2024-02-01 Laura Martino, Bárbara Serrano, Jaume Alomar, Lola Pérez, Virginia Aragon, Àlex Cobos, Maria Lourdes Abarca, Zeinab Yazdi, Esteban Soto, Mariano Domingo
ABSTRACT: Infections by Erysipelothrix rhusiopathiae occur in domestic animals and cause the disease known as ‘erysipelas’. The ubiquity of Erysipelothrix spp. makes infection possible in a wide range of vertebrates and invertebrates. Cetaceans are highly susceptible to erysipelas, especially those under human care. The number of cases documented in wild cetaceans is low, the pathogenesis is incompletely
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Diet-induced nephrocalcinosis in aquarium-raised juvenile spotted wolffish Anarhichas minor Dis. Aquat. Org. (IF 1.4) Pub Date : 2024-01-18 Karine Béland, Catherine Rousseau, Stéphane Lair
ABSTRACT: Wolffish are regularly housed in aquaria, but little data on their husbandry and health is available for caretakers. High occurrence rates of nephrocalcinosis and urolithiasis have been observed in Atlantic Anarhichas lupus and spotted A. minor wolffish housed at 2 Canadian zoological institutions. To explore the effect of diet on nephrocalcinosis and urolithiasis development, a 16 mo prospective
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Current status of coral disease prevalence at Karimunjawa Island: correlation between land zonation and lesion occurrence Dis. Aquat. Org. (IF 1.4) Pub Date : 2024-01-18 Dio Dirgantara, Mariyam Shidha Afzal, Takashi Nakamura
ABSTRACT: Coral diseases have contributed significantly to the decline of coral populations at both local and global scales. The Karimunjawa Archipelago, located off the coast of Java in Indonesia, is a marine national park with a zonation-based approach, designated by the local government due to its rich coral reef biodiversity. Unfortunately, there is a limited amount of research regarding the prevalence
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Epidemiological cut-off values for non-O1/ non-O139 Vibrio cholerae disc diffusion data generated by standardised methods Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-12-14 Peter Smith, Laëtitia Le Devendec, Eric Jouy, Emeline Larvor, Jean Lesne, Alexander K. T. Kirschner, Carmen Rehm, Melanie Leopold, Sonja Pleininger, Florian Heger, Claudia Jäckel, Cornelia Göllner, Jonas Nekat, Jens Andre Hammerl, Sandrine Baron
ABSTRACT: This work generates the data needed to set epidemiological cut-off values for disc-diffusion zone measurements of Vibrio cholerae. The susceptibility of 147 European isolates of non-O1/non-O139 V. cholerae to 19 antibiotics was established using a standardised disc diffusion method which specified incubation of Mueller Hinton agar plates at 35°C. Epidemiological cut-off values were calculated
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Characterising injuries and pathologies of common dolphin Delphinus delphis mortalities in the South Australian Sardine Fishery Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-12-14 C. Kemper, I. Tomo, G. Bovari, D. Hamer, S. Gibbs, T. Segawa Fellowes
ABSTRACT: Mortality of dolphins in fishing operations is often under-estimated, as shown by studies of beach-washed carcasses. Linking evidence obtained during necropsies with fishing method is fundamental to understanding the extent of mortality and the manner in which animals die. The South Australian Sardine Fishery (SASF) has operated a purse-seine industry since 1991. This study characterised
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Prevalence of the scuticociliate Orchitophrya stellarum in seastars from the Pacific and Atlantic oceans Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-12-14 C. Louise Goggin, Tommy L. F. Leung, Maria Byrne, Nicole E. Murphy, Terry Koen
ABSTRACT: As part of a study to investigate the use of the scuticociliate Orchitophrya stellarum as a biological control for the invasive seastar Asterias amurensis in Australia, we collected prevalence data for O. stellarum from 3 seastar species (A. amurensis, A. rubens, Pisaster ochraceus) between 1996 and 1999 from the Pacific (Australia, Japan, Korea, Canada) and Atlantic (France, Netherlands
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Hamartoma affecting ampullary electroreceptors and epitheliotropic lymphoma in a captive electric eel Electrophorus varii Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-12-14 W. Baskerville, K. Holder, P. Chen, E. E. B. LaDouceur
ABSTRACT: Few reports are available describing lesions in captive electric eels Electrophorus spp. This report describes 2 types of cutaneous proliferative lesions (i.e. hamartoma and neoplasm) in a captive electric eel. Ampullary electroreceptor hamartomas appeared grossly as 2 discrete, smooth, pink, spherical, cutaneous masses measuring 6 and 18 mm in diameter. Histologically, hamartomas were composed
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Novel tissue thickening around the notochord sheath found in deformed Japanese eel Anguilla japonica leptocephali Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-11-30 Akihiro Okamura, Yoshiaki Yamada, Naomi Mikawa, Noriyuki Horie, Katsumi Tsukamoto
ABSTRACT: Even though reared leptocephalus larvae of the Japanese eel Anguilla japonica have a high incidence of notochord deformities (>60%), the cause is unknown. We performed histological examinations of the notochord and associated organs in reared larvae to better understand the process causing notochord deformation in eel larvae. In deformed larvae, unknown tissue thickening was discovered near
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Comparison of five commercial kits for isolation of total RNA in samples of WSSV-infected shrimp Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-11-30 Trinidad Encinas-García, Fernando Mendoza-Cano, Adriana Muhlia-Almazán, Juan Vega-Peralta, Arturo Sánchez-Paz
ABSTRACT: Viral diseases are the most serious threat to the expansion and development of shrimp aquaculture. Rapid diagnosis of the white spot syndrome virus (WSSV), a lethal shrimp pathogen, is essential to restrict its spread and reduce the mortality of infected shrimp. This virus has globally affected the shrimp farming industry, with a devastating economic impact. Several studies have focused on
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A new genotype of decapod hepanhamaparvovirus 1 (DHPV) from cultured Penaeus vannamei in South Korea Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-11-16 Myoung Gwang Choi, Soon Joo Hong, Seong Mok Kim, Ki Hong Kim
ABSTRACT: Decapod hepanhamaparvovirus 1 (DHPV), also known as hepatopancreatic parvovirus (HPV), has caused death in larvae or stunted growth in juveniles of cultured shrimp. To date, 4 genotypes (genotype I, II, III, and IV) have been reported from various shrimp species and various geographical regions. In the present study, we isolated 2 types of DHPV (GHPV-Goseong and DHPV-Geoje) from cultured
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Use of brome mosaic virus-like particles in feed, to deliver dsRNA targeting the white spot syndrome virus vp28 gene, reduces Penaeus vannamei mortality Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-10-26 Elena Andrea Ruiz-Guerrero, Ivone Giffard-Mena, María Teresa Viana, Santiago Ramos-Carreño, Samuel Sánchez-Serrano
ABSTRACT: Numerous strategies have been investigated to combat viral infections in shrimp, specifically targeting the white spot syndrome virus (WSSV) that has caused outbreaks worldwide since the 1990s. One effective treatment involves intramuscular application of dsRNA-mediated interference against the viral capsid protein VP28. However, this approach presents challenges in terms of individual shrimp
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Caudal peduncle mineralized lesion resembling calcinosis circumscripta in a wels catfish Silurus glanis Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-10-26 Samuele Zamparo, Massimo Orioles, Ginevra Brocca, Justin Stilwell, Marco Galeotti, Ranieri Verin
ABSTRACT: This report presents an intriguing case of a mineralized lesion resembling calcinosis circumscripta observed in the caudal peduncle of a wels catfish, housed in a public aquarium in northern Italy. The investigation encompasses a comprehensive analysis of various aspects, including clinical presentation, diagnostic imaging, as well as gross and microscopic pathology, and immunohistochemistry
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First report of Perkinsus olseni infections in blood cockles Tegillarca granosa on the south coast of Korea Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-10-26 Young-Ghan Cho, Jeong-Hwa Kim, Hee Jung Choi, Gwang-Il Jang, Yun-Kyeong Oh, Soon-Jeong Lee, Sung-Youl Hong, Mun-Gyeong Kwon, Kwang-Sik Choi
ABSTRACT: The protozoan parasite Perkinsus olseni has become a focus of attention since it has been responsible for mass mortalities and economic losses in a wide range of bivalve hosts globally. The P. olseni host range along the south coast of Korea may extend beyond what was previously understood, and blood cockles in the Family Arcidae are also suggested to be potential hosts of P. olseni. In the
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Decline of Marteilia cochillia in Ría de Arousa may be due to increased resistance in host Cerastoderma edule Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-10-12 David Iglesias, Asunción Cao, María J. Carballal, Antonio Villalba
ABSTRACT: A huge, unprecedented mortality of cockle Cerastoderma edule caused by the protist Marteilia cochillia, which had never before been detected in Galicia (NW Spain), brought on a cockle fishery collapse in the Ría de Arousa (Galicia) in 2012. Since then, the disease dynamic pattern in the shellfish bed of Lombos do Ulla (at the inner area of that ria) involved an overwhelming annual wave of
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B-cell small lymphocytic lymphoma in a free-ranging South American fur seal (Arctocephalus australis) Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-10-12 Derek B. de Amorim, Paula R. Ribeiro, Marcele B. Bandinelli, Joanna V. Z. Echenique, Matheus V. Bianchi, Paula R. Almeida, Fernando R. Spilki, Leticia F. Baumbach, Luciana Sonne
ABSTRACT: Lymphomas are malignant neoplasms of the hematopoietic system arising from lymphocytes with highly variable biologic behavior. B-cell small lymphocytic lymphoma (B-SLL) is a non-Hodgkin lymphoma infrequently described in domestic and wild animals. The present study describes a case of B-SLL in a free-ranging adult male Arctocephalus australis in Brazil. The main necropsy findings included
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Helicobacter delphinicola infection and the risk of gastric disease in common bottlenose dolphin Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-28 Takao Segawa, Yoshito Ohno, Masanori Kurita, Toshiaki Ishibashi, Motoi Yoshioka
ABSTRACT: Gastritis and gastric ulcers are well-recognized conditions in cetaceans; bacteria of the genus Helicobacter are considered the primary cause of these diseases. Dolphins have been shown to be susceptible to infection by at least 2 gastric species of Helicobacter, H. cetorum and H. delphinicola, both of which are closely related to the human pathogen H. pylori. In the present study, we evaluated
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Pseudacris regilla metamorphs acquire resistance to Batrachochytrium dendrobatidis after exposure to the killed fungus. Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-28 Taegan A McMahon,Caitlin L Nordheim,Sarah E Detmering,Pieter T J Johnson,Jason R Rohr,David J Civitello
The pathogenic fungus Batrachochytrium dendrobatidis (Bd) is associated with drastic global amphibian declines. Prophylactic exposure to killed zoospores and the soluble chemicals they produce (Bd metabolites) can induce acquired resistance to Bd in adult Cuban treefrogs Osteopilus septentrionalis. Here, we exposed metamorphic frogs of a second species, the Pacific chorus frog Pseudacris regilla, to
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Perkinsus olseni in green-lipped mussels Perna canaliculus: diagnostic evaluation, prevalence, and distribution. Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-28 Henry S Lane,Diana Jaramillo,Mukul Sharma
Perkinsus olseni (Perkinsidae) is a molluscan parasite notifiable to the World Organisation for Animal Health that is reported in several shellfish hosts in New Zealand, including the native green-lipped mussel Perna canaliculus. Green-lipped mussels comprise over half of New Zealand's aquaculture export value and have historically been considered free of serious diseases based on extensive histology-based
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Infestation rates of lice Lepeophtheirus salmonis and Caligus elongatus on Atlantic salmon in fixed and towed sentinel cages Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-14 C. C. Pert, I. S. Wallace, P. MacDonald, S. C. Ives, A. G. Murray, B. Rabe
ABSTRACT: Sea lice are a key limitation to sustainable salmon aquaculture, and effective monitoring strategies are critical for the management of these parasites. Sentinel cages are an established means of assessing infestation pressure at fixed locations, but as smolts move through systems they will be exposed to varying lice densities. As a means of assessing infestation pressure along trajectories
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Historical isolates of dolphin morbillivirus: origin and new data Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-14 Marie-Françoise Van Bressem, Juan Antonio Raga, Mariano Domingo, Pádraig Duignan
ABSTRACT: Dolphin morbillivirus (DMV) was isolated in striped dolphins Stenella coeruleoalba from the Mediterranean Sea stranded along the coast of Spain during a lethal epidemic that killed thousands of individuals in 1990-1992. Though some of these isolates (MUC, 16A and the reference strain) have been extensively characterised, details on their origin were not reported in the literature, and records
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Temperature-associated virulence, species susceptibility and interspecies transmission of a Lactococcus petauri strain from rainbow trout Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-14 Eric Maxwell Littman, Taylor I. Heckman, Zeinab Yazdi, Tresa Veek, Kaveramma Mukkatira, Mark Adkison, Ashley Powell, Alvin Camus, Esteban Soto
ABSTRACT: Lactococcus petauri is an important emergent aquaculture pathogen in the USA. To better understand environmental conditions conducive to piscine lactococcosis and the susceptibility of fish species, laboratory-controlled challenges were used as models of infection. Rainbow trout Oncorhynchus mykiss maintained at 13 or 18°C were challenged by intracoelomic (ICe) injection with 101, 103 or
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Comparison of methods for determining Batrachochytrium dendrobatidis zoospore viability Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-14 Adeline Chew, Matt West, Laura A. Brannelly
ABSTRACT: The emerging fungal pathogen Batrachochytrium dendrobatidis (Bd) threatens hundreds of amphibian species globally. During laboratory-based experiments it is often essential to quantify live Bd cells, but a comparison of the effectiveness of methods for counting and assessing the viability of the infectious zoospore life stage has not been done. A direct comparison of staining methods that
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Evaluating short- to medium-term effects of implantable satellite tags on southern right whales Eubalaena australis Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-09-14 Claire Charlton, Fredrik Christiansen, Rhianne Ward, Alice I. Mackay, Virginia Andrews-Goff, Alexandre N. Zerbini, Simon Childerhouse, Sacha Guggenheimer, Bridgette OShannessy, Robert L. Brownell Jr.
ABSTRACT: Improving our understanding of the effects of satellite tags on large whales is a critical step in ongoing tag development to minimise potential health effects whilst addressing important research questions that enhance conservation management policy. In 2014, satellite tags were deployed on 9 female southern right whales Eubalaena australis accompanied by a calf off Australia. Photo-identification
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Epidemiological cut-off values for Vibrio anguillarum MIC and disc diffusion data generated by standardised methods Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-31 Peter Smith, Laëtitia Le Devendec, Eric Jouy, Emeline Larvor, Alain Le Breton, Sara Picon-Camacho, Snjeana Zrnčić, Ivana Giovanna Zupičić, Draen Oraić, Süheyla Karataş, David Verner-Jeffreys, Andrew Wokorac Joseph, Edel Light, Alieda van Essen-Zandbergen, Betty van Gelderen, Michal Voorbergen-Laarman, Olga L. M. Haenen, Kees T. Veldman, Lone Madsen, Kári K. Mouritsen, Cecilie Smith Svanevik, Fredrik
ABSTRACT: This work aims to generate the data needed to set epidemiological cut-off values for minimum inhibitory concentration (MIC) and disc-diffusion zone measurements of Vibrio anguillarum. A total of 261 unique isolates were tested, applying standard methods specifying incubation at 28°C for 24-28 h. Aggregated MIC distributions for a total of 247 isolates were determined in 9 laboratories for
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Application of UV-C irradiation prevented a severe outbreak of proliferative kidney disease in rainbow trout aquaculture Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-31 Christopher Naas, Alexander Kappe, Heike Schmidt-Posthaus, Markus Lichtenecker
ABSTRACT: There is an urgent need to establish protocols on how to protect salmonids in aquaculture from outbreaks of proliferative kidney disease (PKD). For this purpose, systems for a continuous application of peracetic acid (PAA, 0.1 mg l-1) and of ultraviolet C light (UV-C, 323.5-158.6 mW s cm-2) were installed in the inlet of raceway-channels within a sub-unit of a commercial rainbow trout Oncorhynchus
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Causes of death and pathogen prevalence in bottlenose dolphins Tursiops truncatus stranded in Alabama, USA, between 2015 and 2020, following the Deepwater Horizon oil spill Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-31 J. C. G. Bloodgood, A. C. Deming, K. M. Colegrove, M. L. Russell, C. Díaz Clark, R. H. Carmichael
ABSTRACT: Between 2010 and 2014, an unusual mortality event (UME) involving bottlenose dolphins Tursiops truncatus occurred in the northern Gulf of Mexico, associated with the Deepwater Horizon oil spill (DWHOS). Cause of death (COD) patterns in bottlenose dolphins since then have not been analyzed, and baseline prevalence data for Brucella ceti and cetacean morbillivirus, 2 pathogens previously reported
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Metagenomic profile of caudal fin morphology of farmed red sea bream Pagrus major Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-17 Eitaro Sawayama, Masaya Takahashi, Shin-Ichi Kitamura
ABSTRACT: The morphology of farm-reared fish often differs from that of their wild counterparts, impacting their market value. Two caudal fin tip shapes, acutely angled and blunted, are recognized in farmed populations of red sea bream Pagrus major. The angled form is preferred by consumers over the blunt since it resembles that of wild fish. Discovering the cause of the blunted tip is crucial to maximizing
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Glomerulocystic kidney in two red piranhas Pygocentrus nattereri Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-17 C. de Sales-Ribeiro, S. R. R. Pisano, N. Diserens, S. Hoby, H. Schmidt-Posthaus
ABSTRACT: Glomerulocystic kidney (GCK) is defined by a dilatation of the Bowman’s space (greater than 2 times the normal size) of more than 5% of all glomeruli. Although GCK has been occasionally documented in dogs, cats, and humans with renal failure, in fish, reports of spontaneous GCK are rare. For the present study, 2 captive adult red piranhas Pygocentrus nattereri from a closed population were
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Limited impact of a bioeroding sponge, Cliona sp., on Ostrea chilensis from Foveaux Strait, New Zealand Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-17 Imke M. Böök, Keith P. Michael, Henry S. Lane, Christopher E. Cornwall, James J. Bell, Nicole E. Phillips
ABSTRACT: Bioeroding sponges can cause extensive damage to aquaculture and wild shellfish fisheries. It has been suggested that heavy sponge infestations that reach the inner cavity of oysters may trigger shell repair and lead to adductor detachment. Consequently, energy provision into shell repair could reduce the energy available for other physiological processes and reduce the meat quality of commercially
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Tension pneumothorax in small odontocetes Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-03 Laura Martino, José Luís Crespo-Picazo, Daniel García-Parraga, Jaume Alomar, Bárbara Serrano, Alex Cobos, Maria Dolores Pérez-Rodriguez, María Frau, Yvonne Espada, Maria Lourdes Abarca, Paula Escaño, Mariano Domingo
ABSTRACT: Pneumothorax, the accumulation of air in the pleural cavity, occurs when air enters the pleural space by the pleuro-cutaneous, pleuro-pulmonary, or pleuro-oesophageal-mediastinal route. Tension pneumothorax is an infrequent and severe form of pneumothorax where a positive pressure in the pleural space is built up during at least part of the respiratory cycle, with compression of both lungs
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Setting epidemiological cut-off values for Vibrio harveyi relevant to MIC data generated by a standardised microdilution method Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-03 Peter Smith, Luana Cortinovis, Tobia Pretto, Amedeo Manfrin, Daniela Florio, Marialetizia Fioravanti, Sandrine Baron, Laëtita Le Devendec, Eric Jouy, Alain Le Breton, Sara Picon-Camacho, Ivana Giovanna Zupičić, Draen Oraić, Snjeana Zrnčić
ABSTRACT: The lack of internationally harmonised criteria for interpreting the data generated by standardised susceptibility testing methods presents a serious obstacle for the development of prudent use of antimicrobials in aquaculture. The data required to set epidemiological cut-off values for minimum inhibitory concentrations for antibiotic agents against Vibrio harveyi was determined using a standard
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Infection with swim bladder nematode Anguillicola crassus in relation to European eel growth, age, and habitat along the German Baltic coast Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-03 Janek Simon, Claus Ubl, Wolf-Christian Lewin, Malte Dorow
ABSTRACT: One possible reason for the European eel (Anguilla anguilla) population decline is the neozoan eel swim bladder nematode Anguillicola crassus. To investigate whether the prevalence of A. crassus and the associated swim bladder pathology is related to eel habitat, growth rate, and age, 728 yellow eels from 6 habitats differing in salinity and located along the German Baltic coast were examined
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Exploring Yersinia ruckeri (O1 Biotype 2) infection in three early life-stages of rainbow trout Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-08-03 Ava Waine, Ioanna Katsiadaki, Marion Sebire, Hannah Tidbury
ABSTRACT: Enteric redmouth disease (ERM) caused by the enterobacterium Yersinia ruckeri poses a significant threat to salmonid aquaculture globally. Despite decades of experimental infection studies, key knowledge gaps remain regarding the onset of disease susceptibility and mechanisms of immunity during early developmental stages, undermining disease management efforts in all susceptible life-stages
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Cook Inlet beluga whale Delphinapterus leucas with valvular endocarditis, encephalitis, rhabdomyolysis, heavy parasitism and fungal dermatitis Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-07-20 Natalie M. Rouse, Kathy Burek-Huntington
ABSTRACT: This is a case report of a Cook Inlet beluga whale Delphinapterus leucas found dead stranded on September 28, 2020 in Turnagain Arm, Alaska. This subadult male had valvular endocarditis, encephalitis, rhabdomyolysis, myoglobinuric nephropathy, severe parasitism and fungal dermatitis. Erysipelothrix rhusiopathiae was detected in the heart lesion, eye and external swabs. The level of infection
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Alphaherpesvirus infection in a free-ranging narwhal Monodon monoceros from Arctic Canada Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-07-06 Ole Nielsen, Thaís C. S. Rodrigues, Marianne Marcoux, Karine Béland, Kuttichantran Subramaniam, Stéphane Lair, Nigel E. Hussey, Thomas B. Waltzek
ABSTRACT: We report the detection of an alphaherpesvirus infecting an adult female narwhal Monodon monoceros captured live during a tagging project in Tremblay Sound, Nunavut, Canada, in August 2018. The individual had 2 open wounds on the dorsum but appeared in good overall health. A blowhole swab was collected, and subsequent virus isolation was performed using a beluga whale primary cell line. Non-syncytial
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White perch health relative to urbanization and habitat degradation in Chesapeake Bay tributaries. II. Hepatic and splenic macrophage aggregates Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-07-06 Mark A. Matsche, Vicki S. Blazer, Erin L. Pulster
ABSTRACT: Macrophage aggregate (MA) abundance in fish is a useful general biomarker of contaminant exposures and environmental stress. Hepatic and splenic MAs were evaluated in semi-anadromous white perch Morone americana (Gmelin, 1789) from the urbanized Severn River (S) and the more rural Choptank River (C), Chesapeake Bay. Fish were collected from different sites in the annual migratory circuit
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White perch health relative to urbanization and habitat degradation in Chesapeake Bay tributaries. I. Biliary neoplasms and hepatic lesions Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-07-06 Mark A. Matsche, Vicki S. Blazer, Erin L. Pulster
ABSTRACT: White perch Morone americana (Gmelin, 1789) from the Chesapeake Bay (USA) watershed have a high incidence of liver disease, including neoplasms of bile duct origin. Fish collected seasonally from spring 2019 to winter 2020 from the urban Severn River and the more rural Choptank River were evaluated for hepatic lesions. Biliary hyperplasia (64.1%), neoplasms (cholangioma and cholangiocarcinoma
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Twenty-year record of white pox disease in the Florida Keys: importance of environmental risk factors as drivers of coral health Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-06-01 Kathryn P. Sutherland, Ashton Griffin, Andrew Park, James W. Porter, Scott F. Heron, C. Mark Eakin, Brett Berry, Dustin W. Kemp, Keri M. Kemp, Erin K. Lipp, John P. Wares
ABSTRACT: Declining coral populations worldwide place a special premium on identifying risks and drivers that precipitate these declines. Understanding the relationship between disease outbreaks and their drivers can help to anticipate when the risk of a disease pandemic is high. Populations of the iconic branching Caribbean elkhorn coral Acropora palmata have collapsed in recent decades, in part due
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Myxobolus lentisuturalis infection in a farmed population of goldfish Carassius auratus from the USA Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-06-01 Caitlin M. Hepps Keeney, Thomas B. Waltzek, Pedro H. de Oliveira Viadanna, Salvatore Frasca Jr., Emily Reinhardt, Jan Lovy, Gregory A. Lewbart
ABSTRACT: Myxobolus lentisuturalis is a myxozoan parasite of piscine muscle that has been described in goldfish Carassius auratus and Prussian carp Carassius gibelio. This report documents a naturally occurring infection of M. lentisuturalis in a population of farmed goldfish in the USA. Postmortem examination was performed on 4 affected goldfish. Gross findings included large cystic cavities along
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Isolation and identification of Streptococcus agalactiae in cage-cultured green chromide Etroplus suratensis in Kerala, India Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-05-25 Sneha Kalasseril Girijan, Rahul Krishnan, Keerthana Maniyappan, Devika Pillai
ABSTRACT: Streptococcus agalactiae is one of the main aetiological agents in large-scale mortalities of tilapia, having caused major economic losses to the aquaculture industry in recent years. This study describes the isolation and identification of the bacteria from cage-cultured Etroplus suratensis that experienced moderate to severe mortalities in Kerala, India. Gram-positive, catalase-negative
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Shrimp MultiPath™ multiplexed PCR white spot syndrome virus detection in penaeid shrimp Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-04-19 R. J. Moser, S. M. Firestone, L. M. Franz, B. Genz, M. J. Sellars
ABSTRACT: White spot syndrome virus (WSSV), which causes white spot disease, is one of the notoriously feared infectious agents in the shrimp industry, inflicting estimated production losses world-wide of up to US$1 billion annually. Cost-effective accessible surveillance testing and targeted diagnosis are key to alerting shrimp industries and authorities worldwide early about WSSV carrier status in
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A new species of Myxobolus (Cnidaria: Myxosporea: Myxobolidae) from the gibel carp Carassius gibelio (Cypriniformes: Cyprinidae) Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-03-23 Marina Dashi-Dorjievna Batueva, Xin-Hua Liu, Jin-Yong Zhang, Vladimir Nikolaevich Voronin, Timur Iminovich Naydanov, Roman Yuryevich Abasheev
ABSTRACT: Myxobolus zhaltsanovae n. sp., is described from the gills of gibel carp Carassius gibelio found during a survey of myxozoans from the watershed of Lake Baikal, Russia, based on morphological and molecular characterizations. Plasmodia of M. zhaltsanovae n. sp. develop extravascularly and measure 500-1000 μm long, 25-100 μm wide. The myxospore is circular to oval, measuring 13.23 ± 0.09 (11
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Microplastic exposure and consumption increases susceptibility to gyrodactylosis and host mortality for a freshwater fish Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-03-23 Numair Masud, Jo Cable
ABSTRACT: Microplastics have been found in all surveyed ecosystems and in the diet of multiple species. Detrimental health impacts of microplastic consumption include reduced growth and fecundity, metabolic stress and immune alterations for both invertebrates and vertebrates. Limited information exists, however, on how disease resistance may be affected by microplastic exposure and consumption. Here
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Histopathological survey of putative parasites and pathogens in non-native slipper limpets Crepidula fornicata Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-03-02 Emma A. Quinn, Sophie H. Malkin, Jessica E. Thomas, Andrew F. Rowley, Christopher J. Coates
ABSTRACT: Two populations of the invasive slipper limpet Crepidula fornicata were sampled in Swansea Bay and Milford Haven, Wales, UK, to determine the presence of putative pathogens and parasites known to affect co-located commercially important shellfish (e.g. oysters). A multi-resource screen, including molecular and histological diagnoses, was used to assess 1800 individuals over 12 mo for microparasites
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First report of Achlya bisexualis infection in captive-reared Endangered golden mahseer Tor putitora Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-03-02 Victoria Chanu Khangembam, Dimpal Thakuria, Vinita Pant, Ritesh Shantilal Tandel, Bipin K. Vishwakarma, Nityanand Pandey, Amit Pande, Pramod Kumar Pandey
ABSTRACT: Achlya bisexualis is a notorious oomycete pathogen with the potential to cause emerging disease in fish farms. In this study, we report the first isolation of A. bisexualis from captive-reared golden mahseer Tor putitora, an Endangered fish species. The infected fish showed a cotton-like growth of mycelia at the site of infection. The mycelium when cultured on potato dextrose agar produced
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First evidence of ranavirus in native and invasive amphibians in Colombia Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-02-16 Sandra V. Flechas, Jenny Urbina, Andrew J. Crawford, Karen Gutiérrez, Katherin Corrales, Luisa A. Castellanos, Mailyn A. González, Andrés M. Cuervo, Alessandro Catenazzi
ABSTRACT: Ranaviruses can cause mass mortality events in amphibians, thereby becoming a threat to populations that are already facing dramatic declines. Ranaviruses affect all life stages and persist in multiple amphibian hosts. The detrimental effects of ranavirus infections to amphibian populations have already been observed in the UK and in North America. In Central and South America, the virus
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Nephrolithiasis in a giant Pacific octopus Enteroctopus dofleini Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-02-16 Samantha M. Hughes, Freeland Dunker, Elise LaDouceur
ABSTRACT: Managed care of cephalopods can be complicated by numerous factors including infectious and non-infectious disease, environmental stressors, and anatomic and physiological changes associated with senescence. The current report describes a unique case of nephrolithiasis in a senescent, >2 yr old female Pacific octopus Enteroctopus dofleini housed in a public aquarium. Clinical signs included
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Parasites and their impact on thick-shelled river mussels Unio crassus from two populations in Luxembourg Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-02-16 E. Lewisch, F. Arnold, H. P. Fuehrer, J. Harl, F. Thielen, M. El-Matbouli
ABSTRACT: The thick-shelled river mussel Unio crassus Philipsson, 1788 is a species native to many European habitats, with declining populations. The impact of parasite communities on health status of this species is poorly understood. In this study, parasites of 30 U. crassus specimens from the Our and Sauer Rivers in Luxembourg were identified morphologically and, in some cases, using molecular genetic
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Mass mortality of collector urchins Tripneustes gratilla in Hawai`i Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-02-02 Thierry M. Work, Julie Dagenais, Bob Rameyer, Renee Breeden, Tina M. Weatherby
ABSTRACT: As grazers, sea urchins are keystone species in tropical marine ecosystems, and their loss can have important ecological ramifications. Die-offs of urchins are frequently described, but their causes are often unclear, in part because systematic examinations of animal tissues at gross and microscopic level are not done. In some areas, urchins are being employed to control invasive marine algae
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Metabolite compositions on skins of eastern hellbenders Cryptobranchus alleganiensis alleganiensis differ with location and captivity Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-02-02 Andrew H. Loudon, Kimberly A. Terrell, Robert W. Davis, Thomas P. Umile, Gregory J. Lipps Jr., Joe Greathouse, Eric Chapman, Kenneth Roblee, John D. Kleopfer, Emma K. Bales, Oliver J. Hyman, Reid N. Harris, Kevin P. C. Minbiole
ABSTRACT: Eastern hellbenders Cryptobranchus alleganiensis alleganiensis, large aquatic salamanders, are declining over most of their range. The amphibian-killing fungus Batrachochytrium dendrobatidis (Bd) has contributed to global amphibian declines and has been detected on eastern hellbenders, but infection intensities were lower than those of species that are more susceptible to Bd. The factors
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First report of yellow-banded tissue loss disease on coral reefs outside the Arabian/Persian Gulf. Dis. Aquat. Org. (IF 1.4) Pub Date : 2023-01-19 Murugan Selva Bharath,Rethnaraj Chandran,Greta Smith Aeby,Ramasamy Senthilkumaran,Kamaraj Ramkumaran,Velukaval Perumal Thanappan,Nandini Ray Chaudhury,Chowdula Satyanarayana
Coral disease is a major cause of coral reef degradation, yet many diseases remain understudied. Yellow-banded tissue loss disease (YBTLD) has a distinct gross lesion morphology and to date has only been reported from the Arabian/Persian Gulf; little else is known about the ecology of the disease. We report on the first occurrence of YBTLD outside of the Arabian/Persian Gulf at 2 sites (Laku Point
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Intraerythrocytic Mycoplasma-like organism diagnosed ultrastructurally as an agent of anaemia in laboratory-reared cyprinid hybrids Dis. Aquat. Org. (IF 1.4) Pub Date : 2022-12-22 I. Dyková, M. Palíková, L. Veteník
ABSTRACT: A study targeting the etiology of severe anaemia that sporadically occurred in laboratory-bred cyprinid hybrids resulted in a diagnosis of a Mycoplasma-like organism selectively invading the cytoplasm of erythrocytes. Despite the fact that there was a concurrent yeast infection in moribund anaemic hybrids, the primary role in the development of anaemia was assigned to the Mycoplasma-like
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Development of a TaqMan quantitative reverse transcription PCR assay to detect tilapia lake virus Dis. Aquat. Org. (IF 1.4) Pub Date : 2022-12-22 Dorothea V. Megarani, Lowia Al-Hussinee, Kuttichantran Subramaniam, Preeyanan Sriwanayos, Kamonchai Imnoi, Bill Keleher, Pamela Nicholson, Win Surachetpong, Puntanat Tattiyapong, Paul Hick, Lori L. Gustafson, Thomas B. Waltzek
ABSTRACT: Tilapia lake virus disease (TiLVD) is an emerging viral disease associated with high morbidity and mortality in cultured tilapia worldwide. In this study, we have developed and validated a TaqMan quantitative reverse transcription PCR (RT-qPCR) assay for TiLV, targeting a conserved region within segment 10 of the genome. The RT-qPCR assay was efficient (mean ± SD: 96.71 ± 3.20%), sensitive
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Two branchial pathological conditions, nuclear hypertrophy and abnormal epithelial proliferation, in Mya arenaria from northwest Russian coasts Dis. Aquat. Org. (IF 1.4) Pub Date : 2022-12-15 Antonio Villalba, Maria Skazina, Seila Díaz, Angel P. Diz, Petr Strelkov
ABSTRACT: Histopathological analysis of soft-shell clams Mya arenaria collected from 2 northwest Russian locations disclosed high prevalence of 2 pathological gill conditions. One involved the occurrence of more or less extended gill areas in which the branchial filaments showed hyperchromatic (basophilic) epithelium with some hypertrophied nuclei, which were considered presumptive signs of viral infection
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Infectious disease threats to amphibians in Greece: new localities positive for Batrachochytrium dendrobatidis Dis. Aquat. Org. (IF 1.4) Pub Date : 2022-12-15 Ilias Strachinis, Rachel E. Marschang, Petros Lymberakis, Korina M. Karagianni, Panagiotis Azmanis
ABSTRACT: In the early 2000s, numerous cases of European amphibian population declines and mass die-offs started to emerge. Investigating those events led to the discovery that wild European amphibians were confronted with grave disease threats caused by introduced pathogens, namely the amphibian and the salamander chytrid fungi Batrachochytrium dendrobatidis (Bd) and B. salamandrivorans (Bsal) and
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Chytrid fungus in amphibians from the lowland Brazilian Amazon Dis. Aquat. Org. (IF 1.4) Pub Date : 2022-12-15 Carolina Lambertini, Julia R. Ernetti, Alexandre F. R. Missassi, Rafael F. Jorge, Domingos da Silva Leite, Albertina P. Lima, Luís Felipe Toledo
ABSTRACT: Infectious diseases are one of the main threats to biodiversity. The fungus Batrachochytrium dendrobatidis (Bd) is associated with several amphibian losses around the globe, and environmental conditions may dictate the success of pathogen spread. The Brazilian Amazon has been considered climatically unsuitable for chytrid fungus, but additional information on Bd dynamics in this ecoregion
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Molecular and microscopic identification of Eomarteilia granula infection in Manila clam Ruditapes philippinarum off the south coast of Korea Dis. Aquat. Org. (IF 1.4) Pub Date : 2022-12-15 Hyun-Sil Kang, Hye-Mi Lee, Naoki Itoh, Young-Ghan Cho, Kwang-Sik Choi
ABSTRACT: A report on the new species Eomarteilia (=Marteilia) granula infecting Manila clam Ruditapes philippinarum from Japan in 2014 suggests the possibility of E. granula infecting other Manila clam populations in the Northwest Pacific region, including Korea. In this study, we report the first infections by E. granula in Manila clams off the south coast of Korea. Histology revealed Marteilia-like