Age, growth, and mortality of Blackfin Tuna in the Gulf of Mexico

IF 1.8 3区农林科学 Q2 FISHERIES Marine and Coastal Fisheries Pub Date : 2024-06-24 DOI:10.1002/mcf2.10293

E. M. Gutierrez, E. T. Lang, M. S. Lovell, J. Lang, B. J. Falterman, S. R. Midway, M. A. Dance

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Abstract

Objective

An otolith-based aging approach was used to evaluate age and growth relationships, sexual dimorphism in growth, and derive mortality estimates for Blackfin Tuna Thunnus atlanticus in the Gulf of Mexico (GOM).

Methods

Blackfin Tuna (n = 395) were sampled from recreational fisheries and aged from 0 to 13 years, representing an increase over previous estimates of longevity for the species.

Result

Rapid growth was exhibited during the first two years of life, and the Richards growth function provided a better fit (L_∞ = 907 mm, k = 0.112 /year, a = 1.05, b = 0.25) to the data compared with the von Bertalanffy growth model (L_∞ = 824 mm, k = 0.365/year, t₀ = −0.96). Sexual dimorphism in growth was observed, with males (907 mm) reaching a larger L_∞ than females (857 mm), and otolith mass was a strong predictor of age in both sexes. Estimated instantaneous total (Z = 0.532/year) and natural (M = 0.467 year) mortality rates for Blackfin Tuna in the GOM were low relative to previous estimates in the southwestern Atlantic, where fishing mortality (F) is likely much higher.

Conclusion

Results represent critical baseline estimates of size-at-age, longevity, and natural mortality for Blackfin Tuna at relatively low levels of exploitation that can be used to inform future assessments.

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墨西哥湾黑鳍金枪鱼的年龄、生长和死亡率

目标采用基于耳石的老化方法评估墨西哥湾（GOM）黑鳍金枪鱼（Thunnus atlanticus）的年龄与生长关系、生长中的性二态性，并得出死亡率估计值。方法从休闲渔业中采集黑鳍金枪鱼样本（n = 395），年龄从 0 岁到 13 岁，比以前对该物种寿命的估计有所提高。结果与 von Bertalanffy 生长模型（L∞ = 824 毫米，k = 0.365/年，t0 = -0.96）相比，理查兹生长函数对数据的拟合效果更好（L∞ = 907 毫米，k = 0.112/年，a = 1.05，b = 0.25）。观察到雄鱼（907 毫米）的 L∞ 大于雌鱼（857 毫米），且耳石质量对雌雄鱼的年龄都有很强的预测作用。估计的 GOM 黑鳍金枪鱼瞬时总死亡率（Z = 0.532/年）和自然死亡率（M = 0.467 年）与之前在西南大西洋的估计值相比较低，而西南大西洋的捕捞死亡率（F）可能要高得多。结论这些结果是在相对较低的开发水平下，对黑鳍金枪鱼的年龄大小、寿命和自然死亡率的重要基线估计，可为今后的评估提供参考。

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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.