Feeding habits of 2 reef-associated fishes, red porgy (Pagrus pagrus) and gray triggerfish (Balistes capriscus), off the southeastern United States

摘要

The feeding habits of red porgy (Pagrus pagrus) and gray triggerfish (Balistes capriscus) were investigated by examining the gut contents of specimens collected during 2009-2011 from live bottom habitats off the southeastern United States. Red porgy had a diverse diet of 188 different taxa. Decapods, barnacles, and bivalves were their main prey. Canonical correlation analysis indicated that depth, season, and fish length were statistically significant factors determining the degree of variability in the diet of red porgy. Gray triggerfish also had a diverse diet, composed of 131 different prey taxa. Barnacles, gastropods, and decapods were their main prey. Of the 4 explanatory variables, latitude was highly significant, and season, depth, and length were statistically significant. Red porgy and gray triggerfish were observed to have a generalized feeding strategy of feeding opportunistically on a wide range of prey. This study contains fundamental trophic data on 2 important fishery species in the southeastern United States. Most importantly, it provides fisheries managers with some of the data necessary for the implementation of an ecosystem-based approach to fisheries management.