Use of hatchery-raised fish in validation of daily age estimates for juvenile Common Snook

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries Pub Date : 2024-12-15 DOI:10.1002/mcf2.10321

Philip W. Stevens, Kyle L. Williams, Meredith B. Pfennig, Ryan W. Schloesser, Alexis A. Trotter, Derek P. Crane

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Abstract

Objective

We investigated the validity of daily age estimates for juvenile Common Snook Centropomus undecimalis by using sectioned and sanded sagittal otoliths.

Methods

Common Snook have a protracted spawning season, which is problematic for validation of daily ages because a hatch date—needed to calculate age—cannot be reasonably assigned like it can for species with a short spawning period (<30 days). To help overcome this, two readers independently counted presumed daily increments in otoliths collected from hatchery-reared Common Snook of known age (100–240 days; n = 91).

Result

Differences between known ages and those estimated from otoliths were small (mean absolute difference = 3.4 days) for individuals aged 100 days, but these differences increased after 100 days, mainly due to the crowding of increments along the otolith margin. Underestimation of ages was 8% at 120 days, 29% at 180 days, and 36% at 240 days.

Conclusion

Ideally, analyses based on counts of daily increments in Common Snook otoliths should be limited to fish with an age of 100 days or younger.

Abstract Image

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利用孵化场饲养的鱼来验证斑诺克幼鱼的日龄估计

目的探讨利用矢状面切片和砂化的耳石对幼年小白腹小白鼠日龄估计的有效性。方法斯努克的产卵季节较长，这给日龄的验证带来了问题，因为计算年龄所需的孵化日期不能像产卵期较短（30天）的物种那样合理地分配。为了帮助克服这个问题，两位读者独立计算了从孵化场饲养的已知年龄的普通斯努克(100-240天；n = 91)。结果100天龄个体的已知年龄与耳石估算年龄之间的差异很小（平均绝对差值为3.4天），但100天龄后这些差异增加，主要是由于耳石边缘的增量拥挤。120日龄低估率为8%，180日龄低估率为29%，240日龄低估率为36%。结论理想情况下，基于普通斯努克耳石每日增量计数的分析应仅限于年龄为100天或更小的鱼。

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

Marine and Coastal Fisheries FISHERIES-MARINE & FRESHWATER BIOLOGY

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

>12 weeks

期刊介绍： Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science publishes original and innovative research that synthesizes information on biological organization across spatial and temporal scales to promote ecologically sound fisheries science and management. This open-access, online journal published by the American Fisheries Society provides an international venue for studies of marine, coastal, and estuarine fisheries, with emphasis on species'' performance and responses to perturbations in their environment, and promotes the development of ecosystem-based fisheries science and management.