使用分选网格减少在刺网渔业中捕获尺寸过小的窄爪小龙虾（Pontastacus leptodactylus Eschscholtz, 1823）的数量

IF 2 3区农林科学 Q2 FISHERIES

Fisheries Management and Ecology Pub Date : 2024-08-01 DOI:10.1111/fme.12731

Mehmet Cilbiz, Celalettin Aydın

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引用次数: 0

摘要

由于小龙虾在经济和生态方面的重要性，其自然种群的可持续性至关重要。小龙虾（Pontastacus leptodactylus）是土耳其内陆渔业中最重要的物种之一，最近却面临着严重威胁。该物种面临的一个威胁是，由于使用选择性渔具（如耙网），上岸的小龙虾尺寸过小，因此误捕率很高。我们估算了不同条间距的小龙虾分拣网格的尺寸选择性，以减少误捕。六种条间距（15.0、17.5、20.0、22.5、25.0 和 30.0 毫米）与商业小龙虾耙网一起进行了测试。15.0 毫米条距的平均选择性（L50）（±95% CI）为 6.90（6.63-6.99）厘米，17.5 毫米为 7.52（7.16-8.02）厘米，20.0 毫米为 8.52（8.32-8.71）厘米，30.0 毫米为 9.70（9.28-9.90）厘米。在这些参数中，小尺寸标本所占比例最大。通过使用分拣格栅，捕捞到的尺寸不足的标本比例从商业耙网的 32.27% 降至 2.46%。条间距为 22.5 毫米的鳕鱼网具选择性更强，丢弃率明显降低，对超过最小保护参考尺寸的个体比商业刺网更有效。

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Sorting grid usage to reduce the catch of undersized narrow‐clawed crayfish (Pontastacus leptodactylus Eschscholtz, 1823) in fyke net fisheries

Sustainability of natural stocks of crayfish is critical because of their economic and ecological importance. Crayfish (Pontastacus leptodactylus), one of the most important species in Turkish inland fisheries, has been facing serious threats recently. One threat the species faces is high landed bycatch of undersized crayfish because of selective fishing gear, such as fyke nets. We estimated size‐selectivity of sorting grids with various bar spacings for crayfish to reduce bycatch. Six bar spacings (15.0, 17.5, 20.0, 22.5, 25.0, and 30.0 mm) were tested alongside commercial crayfish fyke nets. Mean selectivity (L50) (±95% CI) was 6.90 (6.63–6.99) cm for 15.0 mm bar spacing, 7.52 (7.16–8.02) cm for 17.5 mm, 8.52 (8.32–8.71) cm for 20.0 mm, 9.70 (9.28–9.90) cm for 22.5, 10.75 (10.34–11.17) cm for 25.0 mm, 11.80 (11.31–12.24) cm for 30.0 mm, and 8.79 (8.05–9.29) cm for commercial fyke nets. The proportion of undersized specimens caught be reduced from 32.27% for commercial fyke nets to as low as 2.46% by using sorting grids. The codend of 22.5 mm bar spacing was more selective, with significantly lower discard rates, and more effective for individuals above the minimum conservation reference size than commercial fyke nets.

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来源期刊

Fisheries Management and Ecology 农林科学-渔业

CiteScore

3.80

自引率

5.00%

发文量

审稿时长

12-24 weeks

期刊介绍： Fisheries Management and Ecology is a journal with an international perspective. It presents papers that cover all aspects of the management, ecology and conservation of inland, estuarine and coastal fisheries. The Journal aims to: foster an understanding of the maintenance, development and management of the conditions under which fish populations and communities thrive, and how they and their habitat can be conserved and enhanced; promote a thorough understanding of the dual nature of fisheries as valuable resources exploited for food, recreational and commercial purposes and as pivotal indicators of aquatic habitat quality and conservation status; help fisheries managers focus upon policy, management, operational, conservation and ecological issues; assist fisheries ecologists become more aware of the needs of managers for information, techniques, tools and concepts; integrate ecological studies with all aspects of management; ensure that the conservation of fisheries and their environments is a recurring theme in fisheries and aquatic management.