Adult fish abundance depends on survival of early life stages, which are susceptible -among other factors- to environmental variability. Ocean mesoscale events (i.e. eddies, costal upwelling, thermal fronts, cold filaments) can be mechanisms of enrichment, concentration, retention and dispersal in marine environments with effects on survival of marine species early life stages. The Pacific sardine (Sardinops sagax) is an important fishery resource in the Gulf of California (GC), and it can rapidly respond to environmental fluctuations leading to dramatic changes in its abundance and fishery availability. This research analyzed the relationship of frequency and duration of different mesoscale processes with catches of S. sagax in the GC. Generalized additive models were applied to evaluate the effects of mesoscale events on the reproduction period, assuming they would reflect on catches several months later. The results show that eddies mostly affected the seasons with anomalous catches, where optimal duration of both types of eddies were responsible for the significantly high catches, while very high cyclonic and very low anticyclonic eddy duration led to significantly low catches. During the seasons with mean catches, high frequency of coastal upwelling and low persistence of Tropical surface sea water (TSW) northward intrusion were responsible for higher catches, while lower ones were associated to higher persistence of TSW intrusion and lower coastal upwelling frequency. A decreasing trend of coastal upwelling and filaments was detected, while the opposite occurred with TSW intrusion. These aspects should be considered in climate change scenarios because if sea surface temperature continues to increase, its implications in mesoscale processes could have consequences in the Gulf of California trophic dynamics.

成年鱼的丰度取决于早期生命阶段的存活率，除其他因素外，这些生命阶段易受环境变化的影响。海洋中尺度事件（即涡流、沿海上升流、热锋、冷丝）可能是海洋环境中富集、集中、滞留和扩散的机制，对海洋物种早期生命阶段的生存产生影响。太平洋沙丁鱼 ( Sardinops sagax ) 是加利福尼亚湾 (GC) 的重要渔业资源，它可以快速响应环境波动，导致其丰度和渔业可用性发生巨大变化。本研究分析了不同中尺度过程的频率和持续时间与S. sagax捕获量的关系在 GC 中。应用广义加性模型来评估中尺度事件对繁殖期的影响，假设它们会在几个月后反映渔获量。结果表明，涡流主要影响渔获量异常的季节，其中两种涡流的最佳持续时间导致渔获量显着增加，而非常高的气旋和非常低的反气旋涡流持续时间导致渔获量显着降低。在平均渔获量的季节，沿海上升流的高频率和热带地表海水（TSW）向北入侵的低持续性是造成较高渔获量的原因，而较低的则与 TSW 入侵的较高持续性和沿海上升流频率较低有关。检测到沿海上升流和细丝呈下降趋势，而TSW入侵则相反​​。在气候变化情景中应考虑这些方面，因为如果海面温度继续升高，其对中尺度过程的影响可能会对加利福尼亚湾的营养动力学产生影响。