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Temperature, maternal effects and density-dependent processes during early life stages of Argentine hake as relevant recruitment drivers
Fisheries Research ( IF 2.4 ) Pub Date : 2021-02-09 , DOI: 10.1016/j.fishres.2021.105898
Gustavo J. Macchi , Marina V. Diaz , Ezequiel Leonarduzzi , Martín Ehrlich , Laura Machinandiarena , Mariana Cadaveira , María Inés Militelli

We analyzed the annual variability in total egg production and recruitment of the Patagonian stock of Argentine hake since 1990 and correlated these indices with some environmental variables as temperature and larval density estimated in the spawning area. We used data from research surveys carried out between 2001 and 2018 during the reproductive peak of this stock and information from the assessment model. The optimal spawning area of Argentine hake was associated with a bottom thermal front, with temperature values between 9° and 13 °C. The study revealed that reproductive success is positively influenced by the oldest females of the stock and negatively influenced by the egg density in the spawning area. In the first case, a larger proportion of older spawning females (≥ 7 years-old) produces larvae with greater survival rates; while in the second case, a greater abundance of early larvae in a more limited optimum spawning area could produce a higher rate of mortality due to competition.



中文翻译:

阿根廷鳕鱼生命早期阶段的温度,产妇效应和密度依赖性过程是相关的招募推动力

我们分析了1990年以来阿根廷巴塔哥尼亚鳕鱼的总产蛋量和招募的年度变化,并将这些指数与产卵区估计的温度和幼虫密度等一些环境变量相关联。我们使用了该种群繁殖高峰期间2001年至2018年之间进行的研究调查的数据以及评估模型中的信息。阿根廷无须鳕的最佳产卵区域与底部热锋有关,温度在9°至13°C之间。该研究表明,繁殖成功受到种群中最老的雌性的正向影响,而产卵区的卵密度则具有负向影响。在第一种情况下,较大比例的产卵雌性(≥7岁)产生的幼虫具有较高的存活率。

更新日期:2021-02-09
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