IntroductionA sustainable fishery relies on consistent and substantial recruitment. There is, however, considerably high mortality among fish larvae during their early development. One of the most important factors determining larval survival is foraging success. Bigeye tuna is among the most important commercial species in the Indian Ocean. Despite being routinely researched and assessed, it remains unclear how food availability affects the recruitment success of bigeye tuna.MethodsIn this study, we used phytoplankton size (MD50) as an indicator of prey availability and investigated the connection between MD50 and bigeye tuna recruitment from 2000 to 2018 through the Beverton-Holt stock-recruitment function. The Indian Ocean was divided into four regions to accommodate spatial differences.ResultsAs a result, larger MD50 could bring higher recruitment, particularly in the eastern and southern Indian Ocean. Based on the analysis, we inferred that for bigeye tuna, the eastern Indian Ocean is the primary spawning ground, and the peak spawning period falls in Season 2 (April-June).DiscussionThe conclusions provide valuable insights for understanding the recruitment characteristics of bigeye tuna in the Indian Ocean.

中文翻译：

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浮游植物可用性对印度洋大眼金枪鱼（Thunnus obesus）补充的影响


简介可持续渔业依赖于持续和大量的捕捞。然而，鱼类幼虫在早期发育过程中死亡率相当高。决定幼虫存活的最重要因素之一是觅食成功。大眼金枪鱼是印度洋最重要的商业鱼种之一。尽管进行了常规研究和评估，但仍不清楚食物供应如何影响大眼金枪鱼的招募成功。方法在这项研究中，我们使用浮游植物大小（MD50）作为猎物供应的指标，并从 2000 年开始调查 MD50 与大眼金枪鱼招募之间的联系到 2018 年，通过 Beverton-Holt 股票招聘功能。印度洋被分为四个区域以适应空间差异。结果因此，较大的MD50可以带来更高的补充，特别是在东印度洋和南印度洋。根据分析，我们推断，东印度洋是大眼金枪鱼的主要产卵场，产卵高峰期出现在第二季（4-6月）。讨论结论为了解大眼金枪鱼的补充特征提供了有价值的见解。在印度洋。