Recruitment of Yellow Perch (Perca flavescens) Affected by Stock Size and Water Temperature in Lakes Erie and St. Clair, 1965–85

摘要: Two influences on recruitment of yellow perch (Perca flavescens) were considered: parental stock size and spring water temperatures. The data for this analysis obtained from two sources. First, samples trawl catches (near bottom) April to October (1965–85) in the western, central, eastern basins Lake Erie, St. Clair second, gillnet July three Erie (1978–86). relative abundances (CPUE) stocks these study areas as follows: western > central basin. Degree-days mean temperatures ranked Rates warming greatest basin, followed by Clair, rates increase temperature (April June) positively related average total degree-days (above 0°C. Only basin could variations age 1+ be apportioned effect (12%) (51%). Recruitment at 0+ (young-of-year(YOY)) was explained also both rate (17%) pooled gillnets indicated that only (19%) determined abundance yrs-old. yearlings YOY previous year (trawl sample). dependence density evident regression ratio recruits (age 1 +) spawners combined Lakes separate Clair. Similarly, (YOY) shown density-dependent all but Erie. coefficients regressing (0 +, + years) significant less than sample indicating recruitment.