Stock assessment of Aras Crayfish (Astacus leptodactylus Eschscholtz, 1823) for sustainable fishing management

Document Type : Research Paper

Authors

1 Department of Ecology & Aquatic stocks management, Artemia & Aquaculture Research Institute, Urmia University, P.O. Box: 57179-44514, Urmia, Iran

2 Professor, Department of Aquaculture, Artemia and Aquaculture Research Institute, Urmia University

10.22059/jfisheries.2022.338291.1313

Abstract

Aras dam has ecological and socio-economic importance in the West Azerbaijan province, which freshwater crayfish (Astacus leptodactylus) is one of the pristine and important sources of export. To investigate the stock status of this species, two models CMSY and BSM were used from 2013 to 2018 and catch data were analyzed in this respect. Sampling was performed in July 2021 in Aras Dam reservoir. The average catch weight was 88.91 g, total and carapace length was 13.88 cm and 7.5 cm, respectively. The amount of CPUE (Number per trap per day) calculated per day in Station I and SII were 0.06 and 0.013, respectively. Fisheries reference points obtained from CMSY and BSM models showed that the maximum sustainable yield of Aras Dam crayfish was between 18 and 24 t. These results indicated a sharp decline in stock and fishing over the sustainable yield, during the past years. Therefore, it can be generally concluded that the freshwater crayfish stocks of Aras Dam severely damaged. Considering the population parameters, and stock status, as well as the reasons of stock depletion, it can be hoped that if the stock rebuilding program and also the exploitation is defined based on sustainable harvest and maximum allowable catch planned gathered from the results of this study. Therefore, rebuilding of the stocks of this species and prevent its extinction are possible.
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Keywords

References

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Journal of Fisheries
Volume 75, Issue 4 - Serial Number 4
December 2022
Pages 507-520

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