Spatial variation in bigeye tuna Thunnus obesus size at sexual maturity in the eastern Pacific Ocean

Q1 Agricultural and Biological Sciences
Hongji Huang , Cheng Zhou , Liuxiong Xu , Jiangfeng Zhu , Xuefang Wang , Jie Cao
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Abstract

Understanding the reproductive characteristics of a species is of crucial for accurate stock assessment and management plans to ensure sustainable fisheries. In this study, the size at 50% sexual maturity (L50) parameters in different bio-ecological provinces were estimated for bigeye tuna, Thunnus obesus, sampled from the Eastern Pacific Ocean tuna fisheries-dependent survey from 2013 to 2019. The overall sex ratio of the catch during the sampling differed significantly from 1:1. Bigeye tuna exhibit sexual dimorphism in the growth of males and females, with a clear shift in predominance from female to male with increasing sizes. In the North Pacific Sub-tropical Gyre (east) (NPST-east), North Pacific Tropical Gyre (NPTG), Pacific North Equatorial Countercurrent (PNEC), and Pacific Equatorial Divergence (PEQD), females (meals) reached sexual maturity round 102 cm (106 cm), 106 cm (100 cm), 125 cm (110 cm), and 113 cm (110 cm), respectively, the estimated L50 of bigeye tuna was 124.08 cm, 121.97 cm, 139.92 cm and 132.45 cm, respectively. The degree of populations mixing between equatorial (PNEC and PEQD) and high-latitude regions (NPST-east and NPTG) is extremely small, but it is reasonably high between the NPST-east and NPTG or PNEC and PEQD. These parameters were significantly different, suggesting the occurrence of a spatial difference in the size-at-maturity of bigeye tuna between these bio-ecological provinces. The findings of this study provide the key information for understanding the life history of bigeye tuna in the Eastern Pacific Ocean and will contribute to the conservation and sustainable yield of this species.

东太平洋大眼金枪鱼性成熟期体型的空间变化
了解一个物种的繁殖特征对于准确的种群评估和管理计划至关重要,以确保可持续渔业。在这项研究中,对2013年至2019年东太平洋金枪鱼渔业依赖性调查中采样的大眼金枪鱼(Thunnus obesus)在不同生物生态省份50%性成熟度(L50)参数下的体型进行了估计。采样期间捕获物的总体性别比与1:1有显著差异。大眼金枪鱼在雄性和雌性的生长过程中表现出两性异形,随着体型的增加,优势从雌性明显转移到雄性。在北太平洋亚热带Gyre(east)(NPST east)、北太平洋热带Gyre(NPTG)、太平洋北赤道逆流(PNEC)和太平洋赤道分流(PEQD),雌性(餐)分别在102厘米(106厘米)、106厘米(100厘米)、125厘米(110厘米)和113厘米(110 cm)左右达到性成熟,大眼金枪鱼的L50估计为124.08厘米、121.97厘米,分别为139.92厘米和132.45厘米。赤道地区(PNEC和PEQD)和高纬度地区(NPST东部和NPTG)之间的种群混合程度极低,但NPST东部与NPTG或PNEC和PEQD之间的种群混杂程度相当高。这些参数存在显著差异,表明这些生物生态省份之间大眼金枪鱼成熟时的大小存在空间差异。这项研究的发现为了解东太平洋大眼金枪鱼的生活史提供了关键信息,并将有助于该物种的保护和可持续产量。
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
Aquaculture and Fisheries
Aquaculture and Fisheries Agricultural and Biological Sciences-Aquatic Science
CiteScore
7.50
自引率
0.00%
发文量
54
审稿时长
48 days
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