Feeding habits of comber or cabrilla seabass, Serranus cabrilla, were investigated with different indices calculated from digestive contents of commercial samples caught in the Canary Islands. The preferred prey was exclusively the Crustacea, while the secondary prey was the Osteichthyes. The Crustacea Decapoda (Brachyura, larvae, Caridea, and Anomura) were by far the most important prey. The diet did not differ with the coloration of individuals, but with their sexual maturity. Mature fish ingested more Caridea and less Brachyura than the non-mature fish.