<span name="style_bold">Trophic interactions of the six most abundant fish species in the artisanal fishery in two bays, central Mexican Pacific. </span>We surveyed the trophic components in six species of Bahía de Navidad and Bahía de Chamela: <span name="style_italic">Microlepidotus brevipinnis, Caranx caballus, Haemulon flaviguttatum, Lutjanus guttatus, L. argentiventris </span>and <span name="style_italic">Mulloidichthys dentatus</span>. Two main seasonal periods were considered: 1) North Equatorial Counter Current NECC period influence (T1) and 2) California Current CC period influence (T2). In Bahía de Navidad 78 prey <span name="style_italic">taxa </span>were identified in the stomachs. From July to December (T1), 64 prey <span name="style_italic">taxa </span>were found, and from January to June (T2), 45 prey items. In Bahía de Chamela 93 prey items were identified; 74 during T1 and 60 during T2. The highest prey number was found in the stomachs of <span name="style_italic">M. dentatus </span>during T1 in Bahía de Navidad and the lowest prey number (7) was recorded in <span name="style_italic">H. flaviguttatum </span>in Bahía de Navidad in the same period. Crustaceans were the most frequently recorded prey items, followed by fishes, mollusks, polychaetes, and echinoderms in both seasonal periods and sites. The six fish species studied are considered as specialist feeders due the low values of the niche breadth index. There was little similarity among the diets. Rev. Biol. Trop. 58 (1): 383-397. Epub 2010 March 01.in Bahía de Navidad in the same period. Crustaceans were the most frequently recorded prey items, followed by fishes, mollusks, polychaetes, and echinoderms in both seasonal periods and sites. The six fish species studied are considered as specialist feeders due the low values of the niche breadth index. There was little similarity among the diets. Rev. Biol. Trop. 58 (1): 383-397. Epub 2010 March 01.

ecología trófica; peces tropicales; patrones hidroclimáticos; amplitud de nicho; partición de hábitat