Dynamics of clupeiform fish populations such as anchovy are frequently impacted by environmental variations which can affect the success of the species recruitment. Herein, we have analyzed recent otolith growth rate, RNA/DNA nutritional condition index (sRD), and mortality rate of argentine anchovy larvae Engraulis anchoita from three different nursery areas in the Southwest Atlantic. We have evaluated the relationship between the environmental variables (abundance of copepod nauplii, temperature, chlorophyll‐a concentration, and abundance of E. anchoita larvae) and larval endogenous variables (size, weight, age, and otolith radius) to sRD and recent growth rate. Fast larval growth rates were observed toward the northern sector of the studied area, characterized by higher temperature. High values of sRD were associated with higher nauplii abundance in the proximity of coastal fronts. The larvae with the lowest growths and lowest minimum values of nutritional condition coincided with the area where there was less abundance of nauplii and higher larval mortality. Larval size and nauplii abundance were positive explanatory factors for both recent growth rate and sRD index. Temperature had a positive effect on recent growth rate and a negative effect on sRD index. This condition index was poorly explained in terms of model fit in comparison with the growth model. The results herein provided could be significant to better understand the recruitment of the species, as to determining favorable areas for the growth and survival of anchovy larvae.

中文翻译：

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将各个部分放在一起：西南大西洋的gra草（Engraulis anchoita）幼虫的近期生长，营养状况和死亡率

诸如up鱼之类的钩形鱼类种群动态经常受到环境变化的影响，而环境变化会影响物种招募的成功。在此，我们分析最近的耳石的增长速度，RNA / DNA营养状态指数（SRD），和死亡率阿根廷鳀鱼幼体率鳀anchoita从西南大西洋三个不同的育苗区。我们评估了环境变量之间的关系（co足类无节幼体的丰度，温度，叶绿素a浓度和凤尾鱼的丰度）。幼虫）和幼虫内源性变量（大小，体重，年龄和耳石半径）对sRD和近期生长率的影响。在温度较高的区域，观察到的北方区域幼虫生长速度较快。sRD的高值与沿海地区附近的无节幼体丰富度较高有关。具有最低生长和最低营养条件的幼虫与不育幼虫较少且幼虫死亡率较高的地区相吻合。幼虫大小和无节幼体丰富度是近期增长率和sRD指数的积极解释因素。温度对近期增长率有积极影响，而对sRD指数则有不利影响。与增长模型相比，该条件指数在模型拟合方面的解释很差。