Lake Superior Commercial Fish Assessment Studies. Status of Lake Superior Fish Stocks - 1978-1980

摘要

Total lake trout abundance increased during the study period. The population structure is quite fragile, however, as demonstrated by the effect of the weak 1974 plant. Native lake trout abundance remains low, representing 4% of the trout taken in assessment samples. Prospects for rehabilitation of self-sustaining stocks are encouraging if high stocking rates, lamprey control, and harvest restrictions continue. Herring and chub production remain at low levels. Smelt production and effort declined considerably in 1980 due to a combination of poor market conditions.