Overlap in the type and size of the prey that compose the diet of the Pacific sardine Sardinops caeruleus (Girard, 1856), thread herring Opisthonema libertate (Gunther, 1867) and northern anchovy Engraulis mordax (Girard, 1856) in the Gulf of California

We present the results of the analysis of overlap in the diet of the Pacifi c sardine Sardinops caeruleus, the northern anchovy Engraulis mordax and th e thread herring Opisthonema libertate. These are the most commercially imp ortant species of small pelagic fishes in the fishery that is developed in the Gulf of California. Although the diet of these species is very similar, the overlap is only significant between the northern anchovy and the threa d herring. As these two species do not overlap spatially in the Gulf of Cal ifornia, the possibility of competition for food between them is considered unlikely.