H E relatively high arsenic content of many marine fishery products has been established by various investigations. A summary of these by Holmes and Remington (4) shows that marine fish contain approximately ten times and marine crustaceans one hundred times the amount of arsenic carried by nonmarine agricultural foodstuffs. I n view of the growing interest in fresh-water fish oils and the general use of fresh-water fish as food for both man and domestic animals, quantitative findings on the arsenic content of 681 fresh-water fish representing fifteen species taken from fifteen inland waters in Florida, Georgia, Alabama, and Texas are presented.Wet weights were obtained in the field within a few minutes after the fish were caught. The several portions of the fish were removed immediately and preserved separately in arsenic-free ethanol, all parts of each fish being used in every case. The alimentary canal was freed of contained material as far as possible before parts were preserved. The smaller fishes were pooled to give approximately 50-gram samples. Usually fish weighing 18 grams or more were assayed individually, the general size range being 75 to 500 grams.All samples were subsequently desiccated a t 95' C. in electric ovens, and constant weights were obtained at 105' C.