Feeding habits of two shark species: velvet belly, Etmopterus spinax (Linnaeus, 1758) and blackmouth catshark, Galeus melastomus (Rafinesque, 1810), present in fishing discards in the Gulf of Cádiz

IF 1.4 4区环境科学与生态学 Q3 ECOLOGY Environmental Biology of Fishes Pub Date : 2024-02-10 DOI:10.1007/s10641-024-01519-0

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Abstract

In many fisheries, such as trawl fisheries, sharks appear among the catches as bycatch or discards, and these species include velvet belly (Etmopterus spinax) and blackmouth catshark (Galeus melastomus). The objective of this study was to research the feeding habits of both species in the Gulf of Cádiz and to identify possible differences in diet depending on size and time of day. The most frequent sizes were 12–16 cm for E. spinax and 14–20 cm for G. melastomus. Both species preyed mainly on euphausiaceans and teleosts; their Index of Relative Importance (IRI) per species were as follows: E. spinax 42.30% IRI, 21.66% IRI; G. melastomus 52.33% IRI, 27.26% IRI, respectively. Only Etmopterus spinax showed significant variation in diet as a function of the time of day (p < 0.05), although both species showed similar patterns of feeding throughout the day. With respect to size, E. spinax consumes more cephalopods and teleosts as its size increases, while G. melastomus increases its consumption of decapods.

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加的斯湾捕捞弃鱼中的两种鲨鱼：绒腹鲨（Etmopterus spinax，林尼厄斯，1758 年）和黑嘴猫鲨（Galeus melastomus，拉菲尼斯克，1810 年）的摄食习性

摘要在许多渔业中，如拖网渔业，鲨鱼作为副渔获物或丢弃物出现在渔获物中，这些物种包括绒腹鲨（Etmopterus spinax）和黑嘴猫鲨（Galeus melastomus）。本研究的目的是研究这两种鱼类在加的斯湾的摄食习惯，并确定不同大小和不同时间的食性可能存在的差异。E.spinax最常见的体型为12-16厘米，G. melastomus最常见的体型为14-20厘米。这两种鱼主要捕食低等动物和远洋鱼类；每种鱼类的相对重要性指数（IRI）如下：E. spinax 42.30% IRI，21.66% IRI；G. melastomus 52.33% IRI，27.26% IRI。尽管两种鱼全天的摄食模式相似，但只有桫椤的食量随时间的变化而有显著性差异（p < 0.05）。在体型方面，E. spinax随着体型的增大摄食更多的头足类和远足类，而G. melastomus则更多地摄食十足目动物。

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来源期刊

Environmental Biology of Fishes 环境科学-海洋与淡水生物学

CiteScore

2.60

自引率

14.30%

发文量

169

审稿时长

3 months

期刊介绍： Environmental Biology of Fishes is an international journal that publishes original studies on the ecology, life history, epigenetics, behavior, physiology, morphology, systematics and evolution of marine and freshwater fishes. Empirical and theoretical papers are published that deal with the relationship between fishes and their external and internal environment, whether natural or unnatural. The journal concentrates on papers that advance the scholarly understanding of life and draw on a variety of disciplines in reaching this understanding. Environmental Biology of Fishes publishes original papers, review papers, brief communications, editorials, book reviews and special issues. Descriptions and submission requirements of these article types can be found in the Instructions for Authors.