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This study investigated the relationship of the catch rates (CRs) of Spanish mackerel ( Scomberomorus commerson ) with oceanographic factors in the waters around Taiwan by using high-resolution fishery and environmental data for the period 2011–2016. The investigation results revealed that trammel nets accounted for 69.79% of the total catch of  S. commerson  and were operated mostly in the Taiwan Strait (TS). We noted seasonal variations in the distribution of high CRs. These CRs were observed in the southwestern TS, including the waters along the southwestern coast of Taiwan and around the Penghu Islands, and extended to the Taiwan Bank during autumn; they increased in winter. To predict the spatial and temporal patterns of Spanish mackerel density and their relationship with oceanographic and spatiotemporal variables, generalized additive models were used. These models explained 48.4% of the total deviance, which was consistent with the assumed Gaussian distribution. Moreover, all variables examined were significant CR predictors ( p &amp;lt;  0.05). Latitude and longitude were the key factors influencing the spatiotemporal distribution of  S. commerson , and sea surface chlorophyll  a  concentration was a key oceanographic factor. Observing projected changes in El Niño/Southern Oscillation events for  S. commerson  revealed that CRs were higher and distributed further southward during La Niña events than during other events. We inferred that the  S. commerson  distribution gradually moved toward the southwest with the northeast monsoon, which was enhanced during La Niña in winter.

frontiers in marine science

Distribution and Catch Rate Characteristics of Narrow-Barred Spanish Mackerel (Scomberomorus commerson) in Relation to Oceanographic Factors in the Waters Around Taiwan