Determining the hook selectivity of bottom longline used for European hake (Merluccius merluccius, L. 1758) in Saros Bay (northern Aegean Sea, Turkey)

IF 0.8 4区农林科学 Q3 FISHERIES

Iranian Journal of Fisheries Sciences Pub Date : 2020-09-10 DOI:10.22092/IJFS.2020.122555

Alkan Öztekin, Uğur Özekinci, A. Ayaz

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引用次数: 2

Abstract

This study was carried out at Saros Bay, between June 2011 and July 2013 to determine hook selectivity of bottom longlines used on European hake (Merluccius merluccius, L. 1758) fishing. Throughout the study thick type in 6, 7, 8 and 9 sized flat hooks were used between 150 to 400 m depth. 36 fishing operations were carried out and 222 fish were caught by using 7200 hooks in total. Depending on the size of hooks number 8 was the most efficient hook that has caught 114 fish and number 6 was the least efficient one that has caught only 14 fish. The SELECT method is used in the determination of the selectivity parameters. Bi model has given the best fit according to selectivity analysis of five different models. Optimum catching lengths were found 60.09 cm for 6 number hook 51.45 cm for 7 number hook 46.43 cm for 8 number hook 40.11 cm for 9 number hook, respectively in Bi Model model. Minimum size limit for European hake is 25 cm in Turkey. Considering the minimum size limit, use of hooks with gapes larger than number 9 hook (11.75 mm) used in this study is suggested.

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测定沙罗斯湾(土耳其爱琴海北部)欧洲鳕(Merluccius Merluccius, L. 1758)底延绳钓的钩选择性

本研究于2011年6月至2013年7月在Saros湾进行，以确定欧洲鳕鱼（Merluccius Merluccius，L.1758）捕捞中使用的底部延绳钓钩的选择性。在整个研究过程中，在150至400米深度之间使用了6、7、8和9尺寸的厚型平钩。共进行了36次捕捞作业，共使用7200个鱼钩捕获222条鱼。根据钩子的大小，8号钩子是捕获114条鱼的效率最高的钩子，6号钩子是仅捕获14条鱼的效率最低的钩子。SELECT方法用于确定选择性参数。通过对五种不同模型的选择性分析，给出了Bi模型的最佳拟合。在双模型中，6号钩的最佳捕获长度为60.09cm，7号钩为51.45cm，8号钩为46.43cm，9号钩为40.11cm。在土耳其，欧洲鳕鱼的最小尺寸限制为25厘米。考虑到最小尺寸限制，建议使用间隙大于本研究中使用的9号钩（11.75 mm）的钩。

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

Iranian Journal of Fisheries Sciences FISHERIES-

CiteScore

2.30

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： 1- Living various species (contains animals and vegetal species) in various aquatic ecosystems. 2- Health and diseases of aquatic species. 3- Determining the stocks and specific time and location for catching and reliable exploitation for sustainable development. 4- Methods of propagation and culture of high value aquatic resources. 5- Aquatic stock assessment and the methods of restocking the high value species and suggestion for rate, areas and the time for releasing fish and other aquatic organisms fries. 6- Pollutant agents and their effects to the environments of aquatic species. 7- Feed and feeding in aquatic organisms. 8- Fish processing and producing new products. 9- The economic and social aspects of fisheries.