Data-poor stock assessment of Narrow-Clawed Crayfish (Pontastacus leptodactylus) in Keban Dam Lake (Türkiye) Using CMSY Method

IF 1.5 4区农林科学 Q3 FISHERIES

Turkish Journal of Fisheries and Aquatic Sciences Pub Date : 2023-06-23 DOI:10.4194/trjfas22665

Ferhat Demirol

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引用次数: 0

Abstract

In this study, as a data-poor fish stock assessment method CMSY was used to assess the current stock status of the Keban reservoir crayfish stock due to not having further data set for using the data-rich models. A total of 27 years catch data (from 1995 to 2021) was used in the analysing process of study. Estimated CMSY model parameters with confidence intervals are as follows: r=0.426 (0.357 - 0.509) year-1, k=146 (118 - 180) ton, MSY=15.7 (13.0 - 18.0) ton, B2021=77.9 (59.5 - 86.7) ton, BMSY=72.8 (58.9 - 89.9) ton, F2021 = 0.295 (0.265 - 0.386) year-1, FMSY = 0.213 (0.179 - 0.254) year-1, B2021/ BMSY = 1.07 (0.818 - 1.190) and F2021/FMSY = 1.38 (1.240 - 1.81). Our study has found that the crayfish population in the Keban reservoir has been in decline due to overfishing since the late 1990s. However, the population has shown signs of recovery since 2013 due to reduced fishing activity. After all overexploitation occurred again in 2021. Our analysis also showed that the current quota of 30.5 tons is significantly higher than the MSY of 15.7 tons. Therefore, it is recommended to reduce the crayfish quota to 15.7 tons in order to sustain the population and prevent further decline.

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用CMSY方法对土耳其Keban Dam湖窄爪小龙虾的种群评估

在本研究中，由于没有进一步的数据集来使用数据丰富的模型，因此采用CMSY作为数据贫乏的鱼类资源评估方法来评估克坂水库小龙虾种群的现状。在分析研究过程中使用了总共27年的捕捞数据(1995年至2021年)。估计的CMSY模型参数置信区间如下:r=0.426(0.357 - 0.509)年-1,k=146(118 - 180)吨，MSY=15.7(13.0 - 18.0)吨，B2021=77.9(59.5 - 86.7)吨，BMSY=72.8(58.9 - 89.9)吨，F2021 = 0.295(0.265 - 0.386)年-1,FMSY = 0.213(0.179 - 0.254)年-1,B2021/ BMSY= 1.07(0.818 - 1.190)和F2021/FMSY = 1.38(1.240 - 1.81)。我们的研究发现，自20世纪90年代末以来，由于过度捕捞，克班水库的小龙虾数量一直在下降。然而，自2013年以来，由于捕捞活动减少，种群数量出现了恢复的迹象。毕竟，2021年又发生了过度开采。我们的分析还显示，目前30.5吨的配额明显高于最高年产量15.7吨。因此，建议将小龙虾配额减少到15.7吨，以维持种群数量，防止进一步下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Turkish Journal of Fisheries and Aquatic Sciences FISHERIES-MARINE & FRESHWATER BIOLOGY

CiteScore

3.10

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： Turkish Journal of Fisheries and Aquatic Sciences" (TrJFAS) is a refereed academic journal has been published by Central Fisheries Research Institute of Turkey and Japan International Cooperation Agency (JICA), and published in English. It aims to address research and needs of all working and studying within the many varied areas of fisheries and aquatic sciences. The Journal publishes English language original research papers, critical review articles, short communications and technical notes on applied or scientific research relevant to freshwater, brackish and marine environments. TrJFAS was published biannually (April & November) between 2001 and 2009. A great number of manuscripts have been submitted to the journal for review from acceptance of the SCI index. Thereby, the journal has been published quarterly (March, June, September and December) from 2010 to 2017. The journal will be published monthly in 2018.