Cape Cod Bay Unlike diet composition for the other study areas, diet composition for Cape Cod Bay did not indicate a dominant pelagic prey but did include the common occurrence of demersal prey. Six prey species were only found in Cape Cod Bay. Squid occurred most frequently but accounted for only 2% of stomach-contents biomass biomass (Table 3).
The fig sponge was the top prey in terms of percentage by weight (27%). The diet of bluefin tuna caught in Cape Cod Bay displayed the most diversity among study areas. A total of 16 prey species were identified, of which eight were demersal species. Three species of flounder were identified, representing 9% of the stomach-contents biomass. The occurrence of bluefish as prey in Cape Cod Bay (25%) was the highest among study areas. The amount of food in Cape Cod Bay stomach samples was the lowest for the four Gulf of Maine locations: 60% of the stomachs collected from this area were empty.