Synopsis
Survival of dace eggs in a chalkstream was 8.6 to 21.8% from spawning to hatching. The proportion of dead eggs in samples rose from 4.9% at the end of spawning to 59% after 13 days. The combined number of dead eggs, live eggs and the empty shells of eggs after hatching also began a steady decline soon after the end of spawning. Egg drift was estimated to be 2.0% of the initial egg population. Laboratory studies and field population estimates indicated that macroinvertebrates were capable of eating large numbers of dead eggs but much smaller numbers of live ones. A large part of the fall in egg numbers was accounted for by egg decomposition. There was a close relationship between the percentage of surviving eggs and substrate composition with poor survival in areas of high silt and low gravel content.
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Mills, C.A. Egg population dynamics of naturally spawning dace,Leuciscus leuciscus (L.). Environ Biol Fish 6, 151–158 (1981). https://doi.org/10.1007/BF00002778
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DOI: https://doi.org/10.1007/BF00002778