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Evaluation of the full set of habitat suitability models for vulnerable marine ecosystem indicator taxa in the South Pacific high seas Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-03-16 Matthew Bennion, Owen F. Anderson, Ashley A. Rowden, David A. Bowden, Shane W. Geange, Fabrice Stephenson
In the high seas, regional fishery management organisations are required to implement measures to prevent significant adverse impacts on vulnerable marine ecosystems (VMEs). Our objectives were to develop habitat suitability models for use in the spatial management of bottom fisheries in the South Pacific and to evaluate these and existing models using independent data from high‐quality seafloor imagery
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Poleward catch displacement of blackfin tuna Thunnus atlanticus in the southwestern Atlantic Ocean: Possible effect of increasing water temperatures Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-03-14 Luís Gustavo Cardoso, Rodrigo Sant'Ana, Marcio de Araújo Freire, Stefan Cruz Weigert, Marina Poubel, Natalia Alves Bezerra, Lucas dos Santos Rodrigues
Blackfin tuna Thunnus atlanticus often inhabits warm waters of the western Atlantic Ocean from 40°N (Cape Cod, USA) to 22°S (Rio de Janeiro, Brazil). We recorded the first catches of the species in southern Brazil (34°S) and described its new distribution and fishing grounds. Since 2007, annual catches per trip and frequency of blackfin tuna landings increased for three oceanic fishing fleets in Southern
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Evidence of marine predation on silver New Zealand longfin eels, Anguilla dieffenbachii Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-03-13 Donald Jellyman, Paul Franklin, Kim Aarestrup, Kim Birnie‐Gauvin, Cindy Baker, Phillip Jellyman
The use of Pop‐up Satellite Archival Tags (PSATs) has provided considerable new information about the behaviour of migrating (silver) eels (Anguilla spp.) at sea, with 9 of 19 recognised species or subspecies tagged to date. However, such studies often reported premature tag detachment and relatively high rates of predation. Since 2000, several PSAT‐tagged New Zealand longfin eels, Anguilla dieffenbachii
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Counteracting effects of “hook avoidance” and “hook habituation” on angler catch rates in a catch‐and‐release fishery Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-03-07 Camille L. Mosley, Colin J. Dassow, Christopher T. Solomon, Stuart E. Jones
Catch‐and‐release (C&R) angling is often used to maintain high catch rates but fish vulnerability to capture may decrease following hooking, thereby decreasing angler catch per unit effort (CPUE) (hyperdepletion). To determine if fish post‐capture response affected recapture probability and population‐level CPUE, individual capture histories of Largemouth Bass in two lakes were compared before and
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Effect of temperature on metabolic stress and recovery of two Argyrosomus species from simulated catch‐and‐release angling Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-03-07 Brett A. Pringle, Murray I. Duncan, Alexander C. Winkler, Samuel Mafwila, Charmaine Jagger, Niall J. McKeown, Paul W. Shaw, Romina Henriques, Warren M. Potts
Catch‐and‐release (C&R) angling has grown in popularity due to increasing numbers of conservation‐minded anglers and regulations of recreational fisheries. C&R is often assumed to cause low mortality but can cause physiological and physical impairment. Fish metabolism and temperature interact to play a critical role in the biological functioning of fish. Understanding the relationship between temperature
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White sardine (Escualosa thoracata) stock status in coastal waters of Bangladesh Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-02-28 Mitu Ranjan Sarker, Md. Lal Chan, Mohammed Shahidul Alam
The marine fisheries of Bangladesh have experienced an uncontrolled expansion of fishing over the last few decades. Consequently, most fish stocks became vulnerable to overfishing. Similar to many other fisheries, catch of white sardine (Escualosa thoracata) is rapidly declining. Therefore, three data‐limited approaches (length‐based Bayesian biomass analysis, LBB; length‐based spawning potential ratio
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Fish aggregations at oil and gas platform foundations in the North Sea Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-02-14 Bruno Ibanez-Erquiaga, Henrik Baktoft, Tim Wilms, Tobias Karl Mildenberger, Jon Christian Svendsen
Globally, aging offshore oil and gas (O&G) platforms face resource depletion, and regulations often demand platform removal through decommissioning. In the North Sea, >€90 billion will be needed for decommissioning by 2060. However, the influence of O&G platforms on fish communities is poorly understood. This challenges predictions of possible fisheries scenarios associated with different decommissioning
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Factors affecting walleye and sauger recruitment in Lewis and Clark Lake, South Dakota, 2001–2022 Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-02-14 William J. Radigan, Phil Chvala, Christopher Longhenry, Mark Pegg
Abundance of adult walleye (Sander vitreus) and sauger (Sander canadensis), two important sport fishes, decreased significantly during 2001–2022 in Lewis and Clark Lake, a border water between Nebraska and South Dakota, despite walleye fingerling stocking and stable age-0 abundance of both species. We sought to identify factors that drove variation in age-0 abundance from 2001 to 2022 using an information
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Stock discrimination of two European squids (Illex coindetii, Loligo forbesii) by statolith shape analysis Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-02-06 Bianca T. C. Bobowski, Anne Marie Power, Finlay Burns, Pierluigi Carbonara, Danila Cuccu, Marilena Donnaloia, Maria Cristina Follesa, Ana Moreno, Inna M. Sokolova, Maria Valls, Daniel Oesterwind
We evaluated the feasibility of classifying ommastrephid and loliginid squid species by statolith shape analysis into fisheries management units or stocks. Statoliths of Illex coindetii (Verany, 1839) and Loligo forbesii (Steenstrup, 1856) were studied from multiple areas of the North East Atlantic and Northern Mediterranean Sea during 2021–2022. I. coindetii and L. forbesii individuals were categorized
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Historical cisco Coregonus artedi population collapses in Green Bay, Lake Michigan, and Saginaw Bay, Lake Huron, during the 1950s Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-02-02 Benjamin J. Rook, Yu-Chun Kao, Randy L. Eshenroder, Charles R. Bronte, Andrew M. Muir
Coregonus populations across their Holarctic range have often undergone unexplained collapses. Here, we document causes of collapse for two of the largest Coregonus populations in the world, cisco (C. artedi) in Green Bay, Lake Michigan, and Saginaw Bay, Lake Huron, during the 1950s. We used simulation models, rank-order correlations, and historical literature to evaluate effects of overfishing, interactions
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Restricted genetic connectivity and conservation prospects of Bagrid catfish, Bagrus orientalis, populations in the Rufiji River basin, Tanzania Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-01-19 Jackson L. Saiperaki, Silvia F. Materu, Prisila A. Mkenda, Elly J. Ligate, Cyrus Rumisha
The Bagrid catfish, Bagrus orientalis, historically sustained communities in the Rufiji River basin (RRB), Tanzania, but has rapidly declined due to high consumer demand and unsustainable fishing. Consequently, a Ramsar site was designated within the RRB, although its potential to revitalize overexploited populations beyond its boundaries is uncertain because of limited information on genetic connectivity
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Assessment of the floodplain fishery of Tonle Sap Lake in Cambodia Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-01-17 Jyoti Thapa, Megan English, Chouly Ou, Julia Lanoue, Richard H. Walker
Across the globe, fish stocks have been in decline due to industrialization of fisheries resources, overfishing, pollution, and climate change, thereby warranting more fisheries assessments. The floodplain fishery of Tonle Sap Lake near the Kampong Khleang stilted community in the Chamkar Youn village in Cambodia was evaluated by: (1) characterizing fish assemblage structure and function, (2) highlighting
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Puerulus settlement forecasting in a harvest strategy evaluation of the rock lobster fishery in South Australia Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-01-16 Richard McGarvey, Adrian Linnane, John E. Feenstra, Janet M. Matthews, Lachlan J. McLeay, Annabel Jones, Kyriakos Toumazos, Simon de Lestang
Harvest strategies are utilised in the management of fishery resources globally. Critical to their success is harvest strategy evaluation, whereby future performance is assessed through projection modelling. Using the observed relationship between a puerulus settlement index and model-estimated recruitment, we evaluated a southern rock lobster (Jasus edwardsii) harvest strategy in South Australia.
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Interannual variation in survival of wild Atlantic salmon smolts through a dynamic estuarine habitat Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-01-16 J. Barry, C. Fitzgerald, J. O. Callaghan, R. Kennedy, R. Rosell, W. Roche
Migration timing is critical for diadromous fish, especially for survival. Migration through fresh water and estuarine transitional waterbodies may be an important early life survival bottleneck through potential exposure to anthropogenic pressures and predators. Monitoring smolt movement and survival through riverine and estuarine habitats is important for identifying causes of smolt mortality and
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Lack of population structure in an important fishery species of mud shrimp, Trypaea australiensis Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-01-10 Renae L. Kirby, Catheline Y. M. Froehlich, Samuel Greaves, O. Selma Klanten, Marian Y. L. Wong
From a conservation standpoint, species that are managed without consideration of their population sizes and connectivity have the potential to be over-exploited and/or incur population decline. The burrowing shrimp, Trypaea australiensis, is an important ecosystem engineer and fishery resource caught in large numbers for which population information is unknown for properly managing the species. Here
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Relationships among the fish passage efficiency, fish swimming behavior, and hydraulic properties in a vertical-slot fishway Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-01-05 Di Zhang, Yuanhui Xu, Jun Deng, Xiaotao Shi, Yakun Liu
Three-dimensional hydrodynamic numerical simulation and laboratory fish-passage experiment with juvenile grass carp (Ctenopharyngodon idella) were used to systematically estimate hydrodynamic parameters, fish passage efficiency, fish swimming behavior, and fish swimming trajectories in a vertical-slot fishway (VSF) under five different flow discharges. The spatial-mean time-averaged velocity magnitude
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Acoustic seal deterrents in mitigation of human–wildlife conflicts in the whitefish fishery of the River Iijoki in the northern Baltic Sea area Fish. Manag. Ecol. (IF 2.0) Pub Date : 2024-01-03 Lari Veneranta, Topi K. Lehtonen, Esa Lehtonen, Petri Suuronen
Recovery of many seal populations has intensified seal-fishery conflicts. Acoustic deterrent devices (ADDs), designed to deter seals while minimising collateral harm, provide a potential solution. We investigated feasibility of ADDs to protect a European whitefish (Coregonus lavaretus) fishery in the River Iijoki, Finland, which enters the Baltic Sea. A sound barrier produced by a line of ADDs across
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Dual-method survey of recreational fishing for guitarfishes in Southern and Southeastern Brazil Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-12-28 Thomaz Stefani Fuzetti, Patricia Charvet, Natascha Wosnick
We comprehensively assessed marine recreational fishing of threatened guitarfishes (Pseudobatos percellens, Pseudobatos horkelii, and Zapteryx brevirostris) in Southern and Southeastern regions of Brazil. A dual-method approach integrated social media reports and in-person interviews to explore practices, challenges, and conservation implications of recreational fishing for these species. Seasonal
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Factors associated with Paddlefish (Polyodon spathula) restoration success in Oklahoma Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-12-21 Ryan A. Gary, James M. Long, Brian T. Eachus, Andrew R. Dzialowski, Jason D. Schooley
The Paddlefish (Polyodon spathula) has been extirpated from portions of its native range due to anthropogenic habitat degradation and fragmentation, most notably the impoundment of rivers. To mitigate some of these losses in Oklahoma, Paddlefish have been stocked into reservoirs throughout the state, with variable success in establishing self-sustaining populations. Two factors thought to contribute
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A longline survey for spurdog distribution and life history along the Norwegian coast Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-12-21 Hector Andrade, Tine Nilsen, Tone Vollen, Alf Harbitz, Claudia Junge, Ole Thomas Albert
To improve spatiotemporal data collection and inform future spurdog Squalus acanthias stock assessment, a new dedicated longline survey was initiated in 2021 in coastal waters of southern Norway. The survey comprised a mixture of randomly predefined stations to facilitate unbiased abundance estimates and supplementary stations including informant putative hotspots. During 25 survey days in autumn 2021
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Successes and challenges of fisheries governance in an African wetland fishery: A Case study of fishing camps on the Kafue flats of Zambia Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-12-16 Sililo Agness Musutu, Daniel Nyamphande Phiri
During the last three decades, the Kafue flats floodplain fishery on the Kafue River in Zambia has been increasingly exploited due to more individuals settling in the area and seasonal travellers gaining access to the fishery during flood season. Despite successful governance arrangements that effectively regulated access to fish stocks for many generations, evidence shows that these arrangements are
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Community size-spectra applied to recreational freshwater fisheries in Puerto Rican reservoirs Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-12-01 Brent A. Murry, María de Lourdes Olmeda, Craig Lilyestrom, Daniel S. Adams, Katherine Adase, Miguel García-Bermudez
We developed a management framework based on community size-spectra (CSS) to establish targets to maximize desirable gamefish. We evaluated the influence of relative abundance of fish functional groups and watershed characteristics on the slope of the CSS or ecological efficiency. Both ecological efficiency and capacity were strongly influenced by relative abundance of fish functional groups and the
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Estimating recreational trap-fishing effort for crayfish from zig-zag line transects, drone surveys and enforcement surveys Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-12-04 Göran Sundblad, Annica de Groote, Peter Lundquist, Mattias Larsson, Rasmus Linderfalk, Fredrik Larson
Estimates of recreational fishing effort and catch are needed to inform fisheries management, but such estimates can be challenging to obtain. We combined a zig-zag line transect survey of buoys, a fisheries enforcement survey and a drone survey to estimate recreational effort in the open-access trap fishery for signal crayfish (Pacifastacus leniusculus) in the sixth largest lake in Europe, Lake Vättern
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To pool or not to pool data? Applying a generalized depletion model to assess American eel elver Anguilla rostrata fisheries from multiple rivers in Nova Scotia, Canada Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-12-04 Yu-Jia Lin, Brian M. Jessop
Spatial scales are important for examining health of exploited fishery stocks and guiding management actions. However, information about the optimal spatial scale is still unclear for assessment of transit fisheries, such as elver fisheries of the American eel Anguilla rostrata. We applied a generalized depletion model to assess catch and effort data from three nearby rivers (within 50 km) to test
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Influence of four hook types across four hook removal tools, including bare hands, on the effectiveness of hook removal and reflex impairment of Bluegill (Lepomis macrochirus) captured from a lake in Eastern Ontario Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-11-29 Jeremy Hussey, Luc LaRochelle, Andy J. Danylchuk, Sascha Clark Danylchuk, Benjamin W. C. Cooke, Joshua T. H. Cooke, Cameron J. A. Cooke, Steven J. Cooke
Hook removal devices have been developed to enable rapid release of angled fish, yet little research has evaluated their effectiveness and potential for injury among hook types. We compared the performance of hook removal tools and bare hands with four hook types on freshwater Lepomid sunfish. Dehooking performance was assessed using hook removal time, unhooking difficulty, degree of tissue damage
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Spatial and temporal trends in the relative abundance of Caspian sturgeon during 2006–2022 Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-11-21 Hasan Fazli, Shahram Abdolmaleki, Farhad Kaymaram, Mohammad Reza Behrouz Khoshghalb
We used the bycatch of Caspian sturgeon to quantify the species composition, length structure, spatial and temporal distribution, temporal dynamics of relative abundance (indexed as catch-per-unit-effort, CPUE), effects of fingerlings released, and to forecast future sturgeon stock status. Dynamic factor analysis of temporal changes in species CPUE was used to quantify relationships to environmental
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Stable mean trophic level and decreasing fish size in Central Amazonian fishery landings Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-11-20 Octavio Ferreira de Matos, Diego Valente Pereira, Giulia Cristina dos Santos Lopes, Marcos de Almeida Mereles, Vandick da Silva Batista, Carlos Edwar de Carvalho Freitas, Flávia Kelly Siqueira-Souza
Evaluating trends in fisheries, especially data-limited small-scale fisheries, is challenging. We used fish landings to evaluate changes in composition of fish landings in rivers of the Central Amazon, from a discontinuous historical 28-year series of landings from different data collection systems in main ports of the city of Manaus, the largest consumer market in the region. Annual mean trophic level
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Movements of pikeperch (Sander lucioperca), roach (Rutilus rutilus) and bream (Abramis brama) in a boreal lake, Lake Vesijärvi, Finland Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-11-15 Matti Kotakorpi, Mikko Olin, Jukka Ruuhijärvi, Katja Kulo, Jyrki Lappalainen
Movements of common fish species in large lakes that are inadequately known is challenging for fisheries management. Pikeperch (Sander lucioperca) (n = 478; mean length = 42.1 cm; SD = 7.0), bream (Abramis brama) (n = 775; mean length = 31.1 cm; SD = 5.3) and roach (Rutilus rutilus) (n = 939; mean length = 21.4 cm; SD = 2.0) were marked with individual T-anchor tags to investigate movements in Lake
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Baited remote underwater video stations as a potential tool for assessing coastal rocky fishes in Chile Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-11-13 Alejo J. Irigoyen, Andrés Flores, Santiago Gacitúa, Pablo Merlo, Rodrigo Wiff, T. Mariella Canales
Coastal rocky fish species support important fishing activities, but basic information is lacking for many before catches decline. Monitoring and management of coastal rocky fish species is urgently needed in Chile, but knowledge of these species is fragmentary at best. Performance of Baited Remote Underwater Video Stations (BRUVS) for assessing rocky fish assemblages was evaluated in south-central
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Economic impact of resident and nonresident marine anglers to the local economy in Mecklenburg-Western Pomerania, Germany Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-31 Harry V. Strehlow, Artem Korzhenevych, Jorrit Lucas, Wolf-Christian Lewin, Marc Simon Weltersbach, Carsten Riepe, Robert Arlinghaus
Recreational fisheries catches are increasingly considered in the assessment and management of mixed recreational-commercial marine fisheries, while the contribution of recreational fisheries to the economy is often overlooked. Using a telephone diary survey targeting marine recreational anglers in Germany, we estimated the number of anglers and their expenditures over the course of 1 year (2014–2015)
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Fish know no borders—Implications of the genetic structure and mixed-stock composition to cross-border management of adfluvial brown trout Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-28 Ari Huusko, Raisa Nikula, Pirjo Tanhuanpää, Marja-Liisa Koljonen, Tuomas Leinonen
Effective management of migrating fish stocks requires an understanding of population structure and each stock's contribution to the fishery. Water bodies spanning across national borders pose a particular challenge. We investigated the genetic structure of 13 adfluvial brown trout populations from natal rivers and conducted a genetic mixed-stock analysis of brown trout from the cross-border Lake Pyaozero
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Factors influencing risk perception of inshore and offshore artisanal fishers in a marine protected area in Brazil Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-30 Aline Olimpo dos Santos, Cicero Diogo L. Oliveira, José Gilmar C. de Oliveira Junior, Vandick da Silva Batista
Artisanal small-scale fisheries are crucial for subsistence and food security, especially in developing countries. However, artisanal fishers face stressors, such as economic and social marginalization, conflicts, and overfishing. Socio-economic attributes potentially influence their risk perception. We investigated risk perception among artisanal fishers in a Marine Protected Area through interviews
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The management of common carp fisheries using spawning potential ratio in the southeast of the Caspian Sea Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-27 Mohammad Larijani, Ziya Kordjazi, Rahman Patimar, Gholamali Bandani, Zeinab Ansari, Hojjat Jafarian
Spawning potential ratio (SPR) is an important index used by fisheries biologists and managers to determine how a fishery should be harvested to prevent recruitment overfishing. In the southeastern Caspian Sea, Iran, 3430 common carp Cyprinus carpio were caught by beach seine in 2-week intervals of two fishing seasons in 2019 and 2020. Fork length (FL) was measured to the nearest 1 cm. The age and
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Age, growth, and biomass projections of red porgy Pagrus pagrus (Teleostei, Sparidae) after the fishery collapse in southern Brazil Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-26 Eidi Kikuchi, Luis Gustavo Cardoso, Bruno L. Mourato, Rodrigo Sant'Ana, Manuel Haimovici
A formerly unexploited stock of red porgy that was intensely fished along southern Brazil in the 1970s collapsed in less than a decade. Subsequently, population dynamics or stock status has not been reported, so we updated growth parameters by analysis of otolith annual-increments and micro-increments. Growth did not change after the stock collapsed, which suggested no density-dependent effect. Given
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Morphometric analysis to aid fisheries management of two threatened guitarfish species (Pseudobatos horkelii and Pseudobatos percellens) Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-20 Renata Daldin Leite, Carolina Arruda Freire, Natascha Wosnick
This study aimed to provide data for fisheries management of two threatened guitarfish species, by using linear and geometric morphometric analyses. Linear morphometrics (LM) has limitations in determining minimum catch sizes, whereas geometric morphometrics offers a robust approach to quantifying body form variations with the potential to influence metrics set by legislation. Based on LM analysis
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Mean temperature of the catch index can be masked by changes in catch composition unrelated to ocean warming Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-18 Ali Alajmi, Abdulrahman Ben-Hasan, Tariq Alrushaid, Arezoo Vahabnezhad, Daniel Pauly
Oceans are increasingly warming through climate change. Fish and invertebrate ectotherms respond to ocean warming through poleward and depth-related migrations, a consequence of which is disruption of fisheries catch compositions. Mean temperature of the catch (MTC) is an index of change in catch composition, from colder to warmer water species. MTC is widely applied as an easily parameterised variable
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Livelihoods and poverty in small-scale fisheries in western Amazonia Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-10-03 David Poissant, Oliver T. Coomes, Brian E. Robinson, Yoshito Takasaki, Christian Abizaid
Small-scale fisheries are vital to millions of rural people, but surprisingly little is known about the environmental and socio-economic factors that guide rural peoples' decisions to adopt a fishery-oriented livelihood. We analyzed data from a large-scale household survey of 3929 households in 235 rural communities in the Peruvian Amazon to develop multi-scalar quantitative models to explain engagement
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Food availability influences angling vulnerability in muskellunge Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-09-23 John F. Bieber, Scott A. MacDougall-Shackleton, Cory D. Suski
Reduced food availability increases the capture of several fish species, although the mechanisms responsible for how food resources result in increased capture are undefined. Our objective was to quantify the mechanism by which food availability might influence the angling vulnerability of muskellunge (Esox masquinongy). We assessed capture rates in the field under different food levels, quantified
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Effects of egg stocking on density, distribution, and size of young-of-year brown trout (Salmo trutta) in a large boreal river in northern Sweden Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-09-21 Daniel Palm, James Losee, Annika Holmgren, Jan-Eric Englund, Gustav Hellström
An understanding of egg densities and juvenile production is critical in salmonid egg stocking projects, but the question is not deeply studied. Given that managers rely on the number of young of the year (YOY) fish to evaluate stocking success, this knowledge gap poses a major challenge. We studied effects of two stocking levels on YOY brown trout at different downstream distances (0–600 m) from the
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Illegal incidents and violations related to Atlantic salmon fishing in Newfoundland and Labrador, Canada, during 2001–2020 Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-09-20 Travis E. Van Leeuwen, David Cote, Sarah J. Lehnert, Sky Ann Lewis, Daryl Walsh, Kerry Bungay, Nicholas I. Kelly, Jason McGinn, Blair Adams, J. Brian Dempson
Resource user compliance is a key element in effective fisheries management. Herein, we examine two decades of enforcement records pertaining to Atlantic salmon from Newfoundland and Labrador, Canada. Illegal incidents were negatively correlated with the number of licensed anglers but not salmon abundance. Over two decades, illegal incidents declined by 66%, even after correcting for the positive relationship
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Genetic sex determination improves Canadian Atlantic salmon (Salmo salar) population assessments Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-09-19 Martha J. Robertson, Sarah J. Lehnert, Nicholas I. Kelly, Lorraine C. Hamilton, Ross A. Jones, Alex L. Levy, Rebecca Poole, Chantelle M. Burke, Steven J. Duffy, Amber Messmer, Ian R. Bradbury
Estimating egg deposition for Atlantic salmon population assessments is made difficult by their lack of sexual dimorphism prior to the autumn spawning season. We quantified the effect of sex misclassification from subjective examination of external morphology on egg deposition estimates in four Atlantic salmon populations across multiple years. Sex classification of Canadian salmon using the genetic
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Morphological differences between wild and hatchery-reared Bloater (Coregonus hoyi) from Lake Michigan, USA Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-09-15 Andrew E. Honsey, Yu-Chun Kao, Chris Olds, David B. Bunnell
Coregonines (ciscoes and whitefishes) are economically, ecologically, and culturally important fishes that are distributed throughout the Northern Hemisphere. In the Laurentian Great Lakes, coregonines declined throughout the 19th and 20th centuries, and managers have prioritized their restoration. A key restoration tool is reintroduction via stocking. However, hatchery-reared coregonines can display
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How does climate change affect small scale fisheries? A case study of the Lower Amazon in Brazil Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-09-15 Maura da Silva Costa Furtado, Joaquim Carlos Barbosa Queiroz, Bianca Bentes, Nelson de Almeida Gouveia, Marcus José Alves de Lima, Mauro Luis Ruffino, Victoria Isaac
Effects of global climate change on inland artisanal fisheries have received little attention from scientists. We investigated fisheries of the Lower Amazon in Brazil using a wavelet analysis of a 13-year data series of fishery catches, environmental variables, and climatic indices, to determine how these variables affected catches of different species. The catch per unit of effort (CPUE) of gillnet
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Stocking fish in inland waters: Opportunities and risks for sustainable food systems Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-09-15 Ian G. Cowx, Simon J. Funge-Smith, Abigail J. Lynch
Stocking is one of the foremost tools in the inland fisheries management toolbox, but it comes with both opportunities and risks. Stocking is often used as compensation for depleted wild populations, particularly where recruitment processes have been disrupted, but it can introduce disease, disrupt community structures, reduce genetic integrity, and cause conflicts between fishery stakeholders. Despite
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Prioritizing bull trout recovery actions using a novel cumulative effects modelling framework Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-08-11 Laura M. MacPherson, Jessica R. Reilly, Kenton R. Neufeld, Michael G. Sullivan, Andrew J. Paul, Fiona D. Johnston
Complexity of addressing cumulative effects that vary in space and time, especially for species occupying large ranges, makes conservation and recovery of populations difficult. In Alberta, declines of all three native stream trout species led to them being listed as species at risk. We developed a novel, semi-quantitative cumulative effects modelling process to quantify threats using stressor-response
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Estimating lentic recreational fisheries catch and effort across the United States Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-08-11 Matthew D. Robertson, Stephen R. Midway, Holly S. Embke, Anna L. Kaz, Mitchel Lang, Craig Paukert, Nicholas A. Sievert, Lyndsie Wszola, Abigail J. Lynch
Recreational fisheries represent a socially, ecologically, and economically significant component of global fisheries. The U.S. Inland Creel and Angler Survey Catalog (CreelCat) database includes inland recreational fisheries survey data across the United States to facilitate large-scale analyses. However, because survey methods differ, a statistical method capable of integrating these surveys is necessary
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Corroborating otolith age using oxygen isotopes and comparing outcomes to scale age: Consequences for estimation of growth and reference points in northern pike (Esox lucius) Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-08-03 Timo D. Rittweg, Clive Trueman, Elias Ehrlich, Michael Wiedenbeck, Robert Arlinghaus
Accurate age estimates are crucial for assessing the life-histories of fish and providing management advice, but validation studies are rare for many species. We corroborated age estimates with annual cycles of oxygen isotopes (δ18O) in otoliths of 86 northern pike (Esox lucius) from the southern Baltic Sea, compared results with visual age estimates from scales and otoliths, and assessed bias introduced
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Stock assessment of Larimus breviceps, a bycatch species exploited by artisanal beach seining in Northeast Brazil Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-24 Lucas Santos, Jonas Vasconcelos-Filho, Leandro N. Eduardo, Alex Lira, Cecília Craveiro, Emanuell F. Silva, Flávia Lucena-Frédou
Motorized trawling was banned off part of the Brazilian coast in 1990 due to environmental impacts, thus artisanal fishermen adopted large beach seines as an alternative. No impact assessments have been conducted on any species; therefore, we examined the life history and stock status of shorthead drum, Larimus breviceps, a primary bycatch in tropical shrimp fisheries. Between 2016 and 2017, 969 shorthead
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Using swim-up traps to assess Arctic charr (Salvelinus alpinus) spawning habitat and the phenology and density of emergent fry Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-21 Antony Smith, Nigel Milner, Alexander Papadopoulos, Mathew Seymour, Gary Carvahlo
The Arctic charr (Salvelinus alpinus) is a species of cultural, economic and conservation importance, but hitherto, investigations of critical early life stages have been few. Here, at a lake in the United Kingdom, we used swim-up traps to investigate the phenology of fry emergence and associations between fry density and habitat. The first emergence occurred on 4 or 5 March 2020 and 2021, with numbers
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Patterns in longitudinal distribution of American Eel (Anguilla rostrata) population characteristics in rivers of Puerto Rico Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-18 A. Torres-Molinari, A. C. Engman, K. Pacifici, C. A. Dolloff, B. J. E. Myers, T. J. Kwak
American Eel (Anguilla rostrata) population characteristics and distribution remain drastically understudied in the Caribbean region. We conducted the first island-wide study to evaluate the distribution of density, length, and sex in relation to distance from the mouth of 23 stream reaches in five rivers in Puerto Rico. We found 287 American Eel at a mean density of 156.7 fish/ha. Sex ratios favored
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A global synthesis of peer-reviewed research on the effects of hatchery salmonids on wild salmonids Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-12 John R. McMillan, Brian Morrison, Nick Chambers, Greg Ruggerone, Louis Bernatchez, Jack Stanford, Helen Neville
Hatcheries have long produced salmonids for fisheries and mitigation, though their widespread use is increasingly controversial because of potential impacts to wild salmonids. We conducted a global literature search of peer-reviewed publications (1970–2021) evaluating how hatchery salmonids affected wild salmonids, developed a publicly available database, and synthesized results. Two hundred six publications
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Migratory behavior of Prochilodus argenteus in the São Francisco River Basin, Brazil Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-11 Alexandre Peressin, João de Magalhães Lopes, Lídia Wouters, Francisco Ricardo Andrade Neto, Carlos Bernardo Mascarenhas Alves, Paulo Santos Pompeu
The migratory behavior and spawning of Curimatá-pacu (Prochilodus argenteus) were assessed in a free-flowing remnant spanning approximately 450 km. This evaluation was conducted using radio-tagging and egg sampling, with identification performed through metabarcoding techniques. Among the studied individuals, half migrated 100–365 km upstream, primarily in response to the initial rise in river discharge
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Density-dependent growth, survival, and biomass production of stocked glass eels (Anguilla anguilla) in seminatural ponds Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-10 M. I. Pedersen, G. Rasmussen, N. Jepsen
We sought to demonstrate how eel mortality, growth, and biomass production were related to initial stocking density of glass eels, 18 months after stocking. Glass eels with a mean body mass of 0.29 g were caught in three coastal streams of Denmark, and subsequently stocked at four densities (0.5, 1, 1.5, and 2 individuals m−2) in eight shallow, 200 m2, open ponds. Recapture after 18 months ranged from
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Performance indicators for the large-scale Acoupa weakfish fishery of the Amazon continental shelf Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-07 Hanna Tereza Garcia de Sousa Moura, Niedja Luana da Costa Mescouto, Maria Clara Pinheiro de Souza, Zélia Maria Pimentel Nunes, Bianca Bentes da Silva
The Acoupa weakfish, Cynoscion acoupa, is an important fishery resource of the Brazilian North coast that is commercially valuable, particularly for its gas bladder (fish maw), which is exported to Asian markets. However, because of intensive fishing and lack of reliable data, the Acoupa weakfish is classified as Vulnerable by the IUCN. We used Fisheries Performance Indicators (FPIs) to evaluate C
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Implications of habitat use and movement of stocked juvenile dusky flathead (Platycephalus fuscus) on stock enhancement release strategies Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-07-03 Alistair Becker, Hugh Pederson, Michael B. Lowry, D. Stewart Fielder, Matthew D. Taylor
Stocking of marine fish into coastal systems to augment natural recruitment is a growing practice adopted by fisheries managers around the world. Releasing fish directly into well-resourced nursery grounds greatly increases survival and retention of stocked individuals but requires an understanding of juvenile habitat requirements. In eastern Australia, the dusky flathead (Platycephalus fuscus) is
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Using multivariate autoregressive state-space models to examine stock structure of Greenland halibut in the North Atlantic Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-06-26 J. Úbeda, A. Nogueira, N. Tolimieri, M. Vihtakari, B. Elvarsson, M. Treble, J. Boje
Accurate information on population structure is essential for effective fisheries management. Greenland halibut (Reinhardtius hippoglossoides) in the North Atlantic is managed as four separate offshore stocks. We use Multivariate Autoregressive State-Space (MARSS) models to assess population structure by means of abundance and biomass trends in four regions (Norwegian Sea, Iceland, Southeast Greenland
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Evaluating population trends of juvenile Atlantic Sturgeon at low abundance in a dynamic estuarine environment (Hudson River, New York) Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-06-15 Mark R. DuFour, Song S. Qian
Evaluating population trends in dynamic estuarine environments can be challenging, especially when survey data include a high percentage of zero observations. In fishery-independent surveys, zeros that come from reduced susceptibility to sample gears and reduced availability of the population to the survey impact survey catchability and negatively bias relative abundance indices. A zero-inflated negative
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Intense pressure on small and juvenile coral reef fishes threatens fishery production in Madagascar Fish. Manag. Ecol. (IF 2.0) Pub Date : 2023-06-07 Harinirina Sandra Ranaivomanana, Sébastien Jaquemet, Dominique Ponton, Faustinato Behivoke, Roddy Michel Randriatsara, Jamal Mahafina, Marc Léopold
Size-based indicators are appropriate for monitoring status and guiding management of multi-species, multi-gear fisheries, such as coral reef fisheries. From May 2018 to April 2019, size distribution and composition of coral reef fish catches were monitored through a participatory landing survey in southwestern Madagascar. Fishers targeted a large diversity of fish taxa (75 families) and range of sizes