英国北部河口欧洲鲈鱼(Dicentrarchus labrax)的繁殖情况表明,产卵期与渔业禁渔期不匹配。

IF 1.7 3区 农林科学 Q2 FISHERIES
Joe Dawson, Harriet Lincoln, Anna M. Sturrock, Filipe Martinho, Ian D. McCarthy
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引用次数: 0

摘要

欧洲鲈鱼(Dicentrarchus labrax)是一种具有很高商业和休闲价值的鱼种,但其繁殖率变化很大,而且最近一直在下降。为保护产卵种群而采取的应急管理措施包括每年在 2 月至 3 月的两个月时间内关闭商业和休闲渔业。这一保护措施是否对这一缺乏数据的物种产生了预期效果,目前仍不清楚。我们利用耳石微观结构分析(每日生长环的计数和宽度以及表明沉降的检查标记)来估算:(1) 产卵时间;(2) 中上层幼体持续时间和沉降时间;(3) 生长速度和状态;(4) 从威尔士两个河口(Dwyryd 和 Y Foryd)捕获的欧洲海鲈幼鱼的耳石-鱼体大小关系,这两个河口位于该物种分布区的北部边缘。我们观察到禁渔期与产卵期之间存在明显的不匹配,99.2%的新鱼在渔场重新开放后产卵(回溯计算的产卵期中位数=5月5日±17天SD),这表明禁渔期可能过早,无法充分保护该种群。此外,我们首次根据经验估算了在英国栖息地定居的海鲈新鱼的中上层幼鱼持续时间,结果显示其与产卵日期呈强烈的负相关。最后,我们发现两个河口的鱼类状况存在显著差异,这表明当地的栖息地质量存在差异。这些结果表明,目前的禁渔时间可能无法充分保护供应这些最北端河口的产卵者,而随着海鲈分布在未来气候条件下向北转移,这些河口可能会变得越来越重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Recruitment of European sea bass (Dicentrarchus labrax) in northerly UK estuaries indicates a mismatch between spawning and fisheries closure periods

Recruitment of European sea bass (Dicentrarchus labrax) in northerly UK estuaries indicates a mismatch between spawning and fisheries closure periods

European sea bass (Dicentrarchus labrax) is a species of high commercial and recreational value, but it exhibits highly variable recruitment rates and has been subject to recent declines. Emergency management measures put in place to protect spawning stocks include the annual closure of commercial and recreational fisheries over a 2-month, February–March, window. Whether this protection measure is having the desired outcome for this data-poor species remains unclear. Otolith microstructural analyses (counts and widths of daily growth rings and check marks indicative of settlement) were used to estimate (1) spawn timing, (2) pelagic larval duration and settlement timing, (3) growth rate and condition, and (4) the otolith-fish size relationship for juvenile European sea bass caught from two estuaries in Wales (Dwyryd, Y Foryd), located at the northern edge of the species range. We observed a significant mismatch between the timing of fisheries closures and the spawning, with 99.2% of recruits having been spawned after the fishery had reopened (back-calculated median spawn date = May 5 ± 17 days SD), suggesting that the closure may be too early to adequately protect this population. Further, we present the first empirically derived estimates of pelagic larval duration for sea bass recruits settling in UK habitats, which showed a strong negative relationship with spawn date. Finally, we found significant differences in fish condition between the two estuaries, suggesting local variation in habitat quality. The results suggest that the timing of current fisheries closures may not be adequately protecting the spawners supplying these northernmost estuaries, which are likely to become increasingly important as sea bass distributions shift northward in our climate future.

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来源期刊
Journal of fish biology
Journal of fish biology 生物-海洋与淡水生物学
CiteScore
4.00
自引率
10.00%
发文量
292
审稿时长
3 months
期刊介绍: The Journal of Fish Biology is a leading international journal for scientists engaged in all aspects of fishes and fisheries research, both fresh water and marine. The journal publishes high-quality papers relevant to the central theme of fish biology and aims to bring together under one cover an overall picture of the research in progress and to provide international communication among researchers in many disciplines with a common interest in the biology of fish.
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