The relict amphipod Pontoporeia affinis at 100 m depth in Cayuga Lake, New York, had a lipid content of 33.1% of dry weight, which is unusually high for a benthic crustacean. This high lipid content resulted in the unusually high caloric content of 5240 cal/g dry weight, and a mean annual standing crop of 370 cal/m2. Annual production was estimated to be 1565 cal/m2 per year. In confirmation of the high caloric value, P. affinis from an oligotrophic lake in northwestern Ontario had a caloric content of 4741 cal/g dry weight.
