Alimentación del pez limón, Seriola lalandi (Valenciennes, 1833 in Cuvier y Valenciennes, 1833) en aguas bonaerenses
The yellowtail kingfish, Seriola lalandi, Carangidae (Valenciennes, in Cuvier y Valenciennes, 1833) is a pelagic, schooling fish, with gregarious behaviour. It is a circumglobal species from tropical and temperate waters. Adult S. lalandi migrate to Argentine waters (SW Atlantic) during summer months (January-April). They have been reported from Argentine waters in depths of 20-36 m between 36°S and 38° and, as reported elsewhere in the world, are often associated with rocky reefs. Samples of S. lalandi were caught using trolling lines during daytime around rocky reefs at 35° 52'-35° 58'S and 54° 45'-54° 48'W, on February 15-22, 2002. Sixty-six adult S. lalandi were analyzed, with specimens measured (LT) and weighted (WT). The length-weight relationship was estimated. The stomach contents were examined, and were found to be comprised primarily of Trachurus lathami. 76% of stomachs contained food, indicating a relatively high feeding activity during the study period. The percentage of the stomach contents showed two peaks during daytime: one in the morning and another during the afternoon. There are few studies on the diet of S. lalandi food in the SW Atlantic. The coastal waters of the study area are productive, due in part to the outflow from the Río de la Plata, and these waters have a high biomass of small pelagic fishes such as anchovy Engraulis anchoita and horse mackerel Scomber japonicus. As a consequence, the region may be an important summer feeding ground for migratory species such as S. lalandi, Sarda sarda and Pomatomus saltatrix, which come from the continental shelf of southern Brazil and neighbouring oceanic regions.