Cephalopod fisheries have expanded over the last decade. They are characterised by annual uncertainty in yield quantity and quality. This is attributed to changes in environmental conditions such as temperature combined with the semelparous life strategy (one reproductive cycle during life) of the majority of squid species. We determined the effect of environmental temperature on several individual- and population-level characteristics of Illex argentinus, a squid species in the South Atlantic that sustains one of the largest commercial squid resources in the world. The effect of temperature on dorsal mantle length, proportion of mature females, and abundance was determined in the context of the I. argentinus life cycle periods, and migration patterns. This was achieved by performing 520 linear regressions using a 20-year time series of fisheries data and monthly temperature data from the key regions associated with I. argentinus life cycle on the Patagonian Shelf in the Southwest Atlantic. Temperatures above 17.5 °C in the hatching grounds lead to smaller and less mature females in the Falkland Islands waters, during the feeding period. Larger females, a higher proportion of mature and maturing females, and a lower abundance of I. argentinus were found in the Falkland Islands waters when temperatures in the migration areas were higher than 13.5 °C. These findings will aid in the forecasting and assessment for future fishing seasons of this vital squid resource in the Southwest Atlantic.

在过去的十年中，头足类的捕捞活动有所扩大。它们的特征是产量和质量的年度不确定性。这归因于环境条件的变化，例如温度，以及大多数鱿鱼物种的同性生命策略（生命中一个生殖周期）的结合。我们确定了环境温度对南美洲鱿鱼物种Illex argentinus几个个体和种群水平特征的影响，该物种维持着世界上最大的商业鱿鱼资源之一。在阿根廷I.的背景下，确定了温度对背甲长度，成年雌性比例和丰度的影响生命周期周期和迁移模式。这是通过使用20年时间序列的渔业数据和来自与西南大西洋巴塔哥尼亚大陆架上阿根廷阿根廷人生命周期相关的关键地区的月度温度数据执行520个线性回归来实现的。在饲养期间，在孵化场中高于17.5°C的温度会导致福克兰群岛水域的雌性变小和成熟。当迁移地区的温度高于13.5°C时，在福克兰群岛水域发现较大的雌性，成熟和成熟的雌性比例较高，以及阿根廷I.丰度较低。这些发现将有助于对西南大西洋这一重要鱿鱼资源的未来捕鱼季节进行预测和评估。