Derivation of a standardized index to explore spatial, seasonal and between-year variation of squid (Loligo spp.) abundance in the English Channel

IF 2.2 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2025-03-22 DOI:10.1016/j.fishres.2025.107333

Anna Marcout , Eric Foucher , Graham Pierce , Jean-Paul Robin

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引用次数: 0

Abstract

Long-finned squids are among the valuable resources exploited by English Channel demersal fisheries. This resource consists of two short-lived species (not distinguished in landings): Loligo forbesii and Loligo vulgaris, which differ in the timing of their life cycle. In the present study, we investigated spatial, seasonal and long-term biomass variation of Loligo spp. in the English Channel using 22 years (2000–2021) of commercial fishing data to compute biomass indices. Results indicated that landing per unit of effort (LPUE) indices (computed per month for each statistical rectangle of the English Channel), standardized by vector autoregressive spatio-temporal (VAST) method, provided an appropriate squid biomass estimator. Two distinct geographical patterns were observed in the English Channel, with low and stable biomass indices in the West and most of the fluctuations and seasonal variations in East. Within each year, the observed increase in abundance in June is likely to correspond to the recruitment of the loliginid squid into the fishery. Abundance typically rises from June to December and then gradually decreases from January to May. Over the 22-year series there has been an eastward shift in squid biomass since 2014. This information is valuable for fishers but also to manage fisheries, as it offers potential indices of squid availability to the fisheries and a direct quantification of loliginid biomass variability in the ecosystem.

查看原文本刊更多论文

推导标准化指数以探索英吉利海峡鱿鱼（Loligo spp.）丰度的空间、季节和年际变化

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来源期刊

Fisheries Research 农林科学-渔业

CiteScore

4.50

自引率

16.70%

发文量

294

审稿时长

15 weeks

期刊介绍： This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.