The Effect of Competition with Yellow Perch on the Survival and Growth of Planted Brook Trout, Splake, and Rainbow Trout in a Small Ontario Lake

摘要

Matched plantings of hatchery-reared yearling brook trout (Salvelinus fontinalis) and splake (Salvelinus namaycush #xD7; S. fontinalis) or brook trout and rainbow trout (Salmo gairdneri) were made in Little Minnow Lake for 6 yr prior to and 6 yr following the introduction of yellow perch (Perca flavescens). The mean return for each kilogram of fish planted was 3.3, 6.8, and 6.1 kg, respectively, for brook trout, splake, and rainbow trout in pre-perch years but after yellow perch became established the mean returns were 0.4, 0.9, and 0.8 kg, respectively, all less than the weight planted.