Growth responses of yellow perch,Perca flavescens (Mitchill), to lake acidification in the La Cloche Mountain Lakes of Ontario

Synopsis Acidification of the lakes of the La Cloche Mountains, Ontario, has reduced population densities of the yellow perch. Yellow perch of age groups 1 to 3 responded with increased rates of growth. Yellow perch of age groups 4 to 9 responded with reduced rates of growth. On the basis of these findings it is suggested that the growth rate of yellow perch may serve as a valuable indicator of environmental stress. Based on a thesis submitted by P.M.R. in conformity with the requirements for the degree of Master of Science in the University of Toronto.