Environmental Study of Fish Spawning and Nursery Areas in the St. Clair-Detroit River System

摘要

Fish species as a spawning and nursery area differed in 1983 and 1984 in the rivers. Changing water temperatures and ice conditions probably contributed to the difference. The effect of extended lock operations to January 31 + or - 2 weeks on fish reproduction is uncertain. Only three species spawn immediately before or during the period covered by the proposed extension; the others spawn in spring or summer. Results from the study cannot be used to demonstrate impact, but will serve as baseline data to identify existing fish spawning and nursery conditions under current vessel traffic levels.