To evaluate the extent of predation by various fishes on newly stocked landlocked salmon (Salmo salar), 21 Maine lakes were gillnetted or trapnetted following stocking in 1965-67. Chain pickerel were found to be the most common predator. Evidence of pickerel predation on stocked salmon was found in 11 (69 percent) of 16 study waters. Of 173 pickerel examined, 53 (31 percent) contained 1 or more newly stocked salmon. For those pickerel stomachs containing salmon, there was an average of 1.6 salmon per pickerel. There appeared to be little selection for size of salmon prey by pickerel. Of 48 lake trout examined from six lakes, only 2 fish (4 percent) contained salmon stocked as spring yearlings. Only one occurrence of cannibalism was found in 53 salmon examined from eight lakes. Stocked salmon were found in 1 (3 percent) of the 32 burbot stomachs examined. Of 203 yel- low perch examined from 11 lakes, 7 fish (4 percent) contained stocked salmon. No evidence was found of salmon predation by brook trout, white perch, smallmouth bass, or fallfish. The possible ef- fects of predation by the various fishes on overall salmon survival are discussed. Possible methods for reducing predation by pickerel are suggested. Continuing studies of Maine's sport fish- eries and fishery resources have shown that landlocked salmon may survive and pro- vide a worthwhile sport fishery in lakes formerly considered to be unsuitable salmon habitat. Water quality requirements for salmon as established by Cooper (1940) in- cluded an abundant supply of cold water (less than 70-75 F), at least 5 ppm of dis- solved oxygen, and a pH above 6.0. Re- search projects and lake inventory studies,