Spatial and Sex-Specific Growth Variations of Migratory Coilia nasus in the Middle and Lower Yangtze, China.

IF 3.5 3区 生物学 Q1 BIOLOGY
Hongyi Guo, Xuguang Zhang, Wenqiao Tang, Kai Liu
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引用次数: 0

Abstract

The Japanese grenadier anchovy (Coilia nasus), an economically vital anadromous species in the Yangtze River, has experienced severe population decline, prompting a 10-year fishing moratorium. Comprehensive data on its population structure and spatial growth variations during this critical recovery period, however, remain scarce. This study addresses this gap by analyzing 1119 individuals sampled from four sites along the species' migratory corridor during the 2024 spawning season. We assessed key life-history traits to quantify spatial and sex-specific dynamics. We found significant sexual dimorphism, with females attaining greater size and age than males. The population was highly structured spatially: larger individuals were captured farther upstream, and initially female-biased sex ratios became more balanced inland. Growth modeling revealed that females had higher asymptotic lengths (L) but lower growth coefficients (k). Furthermore, macroscopic assessment of gonadal maturity identified contrasting reproductive schedules between sexes along the migratory route. These results demonstrate clear sex-specific life-history strategies and a strong spatial segregation by size and reproductive state. This study provides crucial baseline data from the moratorium period, underscoring the necessity of spatially explicit management-particularly the protection of upstream spawning habitats for larger, more fecund individuals-to aid the recovery of this endangered species.

长江中下游地区迁徙性鼻梳的空间和性别差异
日本长尾凤尾鱼(Coilia nasus)是长江流域一种具有重要经济意义的溯河产卵物种,其数量急剧下降,导致了为期10年的休渔期。然而,在这个关键的恢复期,关于其人口结构和空间增长变化的综合数据仍然很少。本研究通过分析2024年产卵季节在该物种迁徙走廊沿线的四个地点采样的1119个个体来解决这一差距。我们评估了关键的生活史特征,以量化空间和性别特异性动态。我们发现了显著的性别二态性,雌性的体型和年龄都比雄性大。种群在空间上是高度结构化的:更大的个体被捕获到更远的上游,最初雌性偏向的性别比例在内陆变得更加平衡。生长模型显示,雌性具有较高的渐近长度(L∞),但较低的生长系数(k)。此外,性腺成熟度的宏观评估表明,在迁徙路线上,两性之间的生殖时间表存在差异。这些结果显示了明确的性别特异性生活史策略和强烈的空间隔离大小和生殖状态。这项研究提供了暂停期的关键基线数据,强调了空间明确管理的必要性,特别是保护上游产卵栖息地,以帮助这种濒危物种的恢复。
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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来源期刊
Biology-Basel
Biology-Basel Biological Science-Biological Science
CiteScore
5.70
自引率
4.80%
发文量
1618
审稿时长
11 weeks
期刊介绍: Biology (ISSN 2079-7737) is an international, peer-reviewed, quick-refereeing open access journal of Biological Science published by MDPI online. It publishes reviews, research papers and communications in all areas of biology and at the interface of related disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.
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