Elasmobranch Bycatch in a Bottom Trawl Fishery at Al Hoceima Port in Morocco (Mediterranean Sea)

Thalassas: An International Journal of Marine Sciences Pub Date : 2024-02-10 DOI:10.1007/s41208-024-00682-6

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Abstract

This study focused on identifying and estimating the number of rays and sharks caught incidentally in the Moroccan Mediterranean Sea and their seasonal variation. In 2020, from 62 bottom trawl surveys, it was estimated that elasmobranchs represent 6.67% (25 kg) of the total catch (372 kg/trip) per trip in Al Hoceima Bay. Raja clavata and Scyliorhinus canicula were the most abundant species, representing between 27% and 21% of the total elasmobranchs captured, respectively, followed by Prionace glauca (19%) and Oxynotus centrina (13%). Single or sporadic captures of the threatened and protected Isurus oxyrinchus and Mobula mobular were further recorded, as well as of the endemic and threatened Raja radula. Elasmobranch bycatch rates vary with depth, season and fishing area. The current data indicate that the Moroccan Mediterranean may be an important breeding area for many elasmobranchs. They also emphasize the urgent necessity of better understanding the interactions between fisheries and elasmobranchs to develop management measures.

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摩洛哥胡塞马港（地中海）底拖网渔业中的副渔获物

摘要这项研究的重点是确定和估计在摩洛哥地中海偶然捕获的鳐鱼和鲨鱼的数量及其季节性变化。2020 年，通过 62 次底拖网调查，估计在胡塞马湾每次出海的总渔获量（372 千克/次）中，鳍鳃类占 6.67%（25 千克）。Raja clavata 和 Scyliorhinus canicula 是捕获量最大的种类，分别占总捕获量的 27% 和 21%，其次是 Prionace glauca（19%）和 Oxynotus centrina（13%）。此外，还记录到单次或零星捕获受威胁和受保护的 Isurus oxyrinchus 和 Mobula mobular，以及特有和受威胁的 Raja radula。副渔获物的捕获率随深度、季节和捕鱼区域而变化。目前的数据表明，摩洛哥地中海可能是许多鞘鳃类动物的重要繁殖区。这些数据还强调，迫切需要更好地了解渔业与鞘鳃类之间的相互作用，以制定管理措施。

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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Thalassas: An International Journal of Marine Sciences

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