Abstract
Alewife (Alosa pseudoharengus) survival from newly hatched larvae to fall young-of-the-year (YOY) was calculated using data collected in southeastern Lake Michigan, June–November 1974–82. Alewife YOY density (number per 1000 m3) was estimated from trawl catches. Larval alewife densities, derived from plankton net samples at trawling stations and from power plant entrainment samples, were averaged each year for length intervals which represented yolk-sac and post-yolk-sac larvae. Survival (ratios of YOY to larval alewife densities) varied considerably among years, but mean survival over all years from yolk-sac larvae to YOY was 1% calculated from either field-larvae or entrained-larvae data. Mean survival from post-yolk-sac larvae to YOY was higher, 2.2–4.6%. Daily mortality rates were 12–27% for larvae through yolk absorption, decreasing to 2–5% for juveniles. Differences in survival among years may be due to timing of sampling, distribution of larvae and YOY, or actual survival differences, perhaps related to predator abundance.
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