The Environmental Evaluation Work Group: FY 1979 Studies of the Winter Navigation Demonstration Program, St. Lawrence River Fisheries Study

Abstract
Data were collected during the winter and spring of 1979 at Morristown, Chimney Bay and Tibbits Creek, to determine the character of the St. Lawrence River fisheries in these areas. Species abundance and distribution were found to vary by location, time of year and depth of sampling. The number of species of fish collected in gill nets were generally greater in shallow water as compared with deep water stations. Increased adult species abundance and diversity during the spring, relative to the winter, probably reflected increased fish movement associated with spawning and feeding. Ichthyoplankton abundance and species increased progressively throughout the spring. Mean lengths at age for northern pike and yellow perch generally indicated the existence of sexually dimorphic growth. Feeding appeared to be an important activity northern pike and yellow perch during both winter and spring, as evidenced by stomach content analyses.

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