Otolith ageing of white seabass (Atractoscion nobilis): Known-age validation, reader performance and sex-specific growth patterns.

IF 1.7 3区 农林科学 Q2 FISHERIES
Michael A Shane, Ruairi MacNamara, Lyall F Bellquist, Mark A Drawbridge
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引用次数: 0

Abstract

The sciaenid white seabass (Atractoscion nobilis) is stocked in California (U.S.) where it supports commercial and recreational marine fisheries. Despite its importance, age and growth remains incompletely understood (e.g., differences between females and males) and has not been validated using known-age fish. In this study, the sectioned sagittal otoliths of 196 hatchery-reared white seabass were analysed. These known-age fish, recaptured after up to 14 years at liberty, allowed reader age interpretation to be validated and reader performance to be quantified. Reader age was not biased relative to true age in hatchery-reared fish, and among-reader precision was high [74.5% agreement, 5.1% average coefficient of variation (ACV)]. Otoliths from wild white seabass were subsequently analysed to develop sex-specific von Bertalanffy growth models, showing that females (age 0-24, n = 355) grow faster and are older than males (age 0-15, n = 381). Otolith morphometric-true age regressions were developed from an expanded dataset of 365 hatchery-reared white seabass to assess an alternative age determination technique for wild conspecifics. Relative to reader age interpretation, age predicted from otolith morphometrics (weight, length, width and thickness) had highly variable agreement (9.5%-68.8%) and ACV (9.5%-44.2%), depending on the age range examined. This study is the first to provide validated, sex-specific age and growth for this moderately long-lived marine fish species, and demonstrates how stocking programmes can serve as an ecological tool to help manage wild populations.

白鲈鱼(Atractoscion nobilis)耳石老化:已知年龄验证,读者表现和性别特异性生长模式。
白海鲈(Atractoscion nobilis)在加利福尼亚(美国)储存,在那里它支持商业和娱乐海洋渔业。尽管它很重要,但年龄和生长仍然不完全清楚(例如,雌性和雄性之间的差异),并且尚未使用已知年龄的鱼进行验证。本文对196条孵化场饲养的白鲈鱼的矢状面耳石切片进行了分析。这些已知年龄的鱼,在长达14年的自由后被重新捕获,使读者的年龄解释得到验证,读者的表现得以量化。在孵化场饲养的鱼中,读者年龄相对于真实年龄没有偏倚,并且读者之间的精度很高[一致性为74.5%,平均变异系数(ACV)为5.1%]。随后对野生白鲈鱼的耳石进行了分析,以建立性别特异性的von Bertalanffy生长模型,结果表明,雌性(0-24岁,n = 355)比雄性(0-15岁,n = 381)生长更快,年龄更大。从365只孵化场饲养的白鲈鱼的扩展数据集中开发了耳石形态计量学-真实年龄回归,以评估野生同种鱼的替代年龄测定技术。相对于读者年龄的解释,耳石形态测量学(重量、长度、宽度和厚度)预测的年龄具有高度可变的一致性(9.5%-68.8%)和ACV(9.5%-44.2%),取决于所检查的年龄范围。这项研究首次为这种中等寿命的海洋鱼类提供了经过验证的、性别特定的年龄和生长情况,并展示了放养计划如何作为一种生态工具来帮助管理野生种群。
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
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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