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Population dynamics of a hololimnetic population of the freshwater prawn Macrobrachium amazonicum (Heller, 1862) (Decapoda, Palaemonidae) in southeastern Brazil

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Abstract

We investigated the population structure, sex ratio, growth parameters, longevity and natural mortality (M) of a hololimnetic population of the Amazon River prawn Macrobrachium amazonicum that presents different morphotypes. Sampling was performed monthly from May 2017 to April 2018 in a water reservoir in the municipality of Severínia, São Paulo, southeast Brazil. Juveniles, ovigerous females (OF) and males (except the morphotypes GC2) were more abundant in the dry season. The overall and seasonal sex ratio leaned toward males. Males were also more abundant in the larger size classes. Growth parameters for males and females were CL∞ = 19.98 mm and 16.94 mm, k = 4.42 year−1 and 3.94 year−1, t0 = -0.3762 and 0.0628, respectively. Longevity was 1.04 years for males and 1.17 years for females, and M was 4.43 year−1 for males and 3.94 year−1 for females. The OF sampled presented smaller sizes in comparison to those registered in the literature, which may be because they reach sexual maturity sooner than in other localities. Males attained larger asymptotic sizes than females; however, their increased growth rate resulted in lower longevity and higher M. High M values among larger males can occur due to disputes over territory, food, and females, while smaller males are often cannibalized. Both sexes presented low longevity, intense growth rates and small asymptotic sizes in comparison to those registered in the literature, which is likely due to high instability in the system caused by environmental variations and anthropic influences.

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Fig. 1

adapted from Nogueira et al. (2020). The black dot represents the sampling site

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adapted from Pantaleão et al. (2014)

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Availability of data and material

Data, associated metadata and calculation tools will be made available on request to the corresponding author (juliaperroca@gmail.com).

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Acknowledgements

JFP would like to thank the doctoral scholarship provided by Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP)—2019/01308-5 and CSN would like to thank the doctoral scholarship provided by Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP)—2019/00661-3. RCC thanks the Brazilian National Council for Scientific and Technological Development, CNPq (Research Scholarship PQ 306672/2018-9) and FAPESP—Thematic Biota (INTERCRUSTA 2018/13685-5).

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Contributions

JFP: Methodology, Data curation, Formal analysis, Writing-original draft, Writing-review and editing. CSN: Conceptualization, Methodology, Data curation, Formal analysis, Writing-original draft, Writing-review and editing. ACB: Methodology, Data curation, Writing-review and editing. RCC: Supervision, Writing-review and editing.

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Correspondence to Júlia Fernandes Perroca.

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The authors declare that they have no conflict of interest.

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All sampling in this study has been conducted in compliance with current applicable state and federal laws.

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Handling Editor: Télesphore Sime-Ngando

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Perroca, J.F., Nogueira, C.S., Carvalho-Batista, A. et al. Population dynamics of a hololimnetic population of the freshwater prawn Macrobrachium amazonicum (Heller, 1862) (Decapoda, Palaemonidae) in southeastern Brazil. Aquat Ecol 56, 21–34 (2022). https://doi.org/10.1007/s10452-021-09889-8

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  • DOI: https://doi.org/10.1007/s10452-021-09889-8

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