Abstract
Distribution and abundance of pelagic larval fish were determined for 12 sites on the north shore of Lake Ontario between Pickering and Wellington. Alewife ( Alosa pseudoharengus) and rainbow smelt ( Osmerus mordax) larvae represented over 99.9% of the total catch in the nearshore zone between the 3- and 13-m depth contours. Yolk-sac alewife and rainbow smelt larvae were widespread, while most post-yolk-sac alewife larvae occurred in sheltered waters east of Colborne; developing alewife larvae moved away from shore in upper water strata. Rainbow smelt larvae were concentrated in surface waters shortly after hatching, with a subsequent rapid decline in abundance as larvae moved away from shore to deeper strata.
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