Food Progression in Young White Perch Morone Americana (Gmelin) from Bantam Lake, Connecticut

摘要: Abstract On August 26 and 27, 1941, collections of young white perch, Morone americana (Gmelin), were made at 8:30 11:30 p.m. 2:30 4:30 a.m. when the fish had moved over shoals. The stomach intestinal contents 50 specimens in each collection examined; estimates fullness stomachs volume various food organisms. position was diagramatically noted. examined from held considerable food, but those subsequent ones increasingly less, until collection, about 95 per cent empty stomachs. most important organisms Cladocera, chironomid larvae, a certain adult Hymenoptera. In following collections, Cladocera gradually decreased digestive tract such forms as Hyalella, ant adults, midge pupae, mayfly nymphs increased greatly. several there ...