Abstract
SUMMARY. In Lake Agios Vasilios, male perch become sexually mature during their first year of life whereas females become sexually mature during their second year. The mean absolute fecundity was 8080 eggs; values ranged from 2080 to 28488. The mean relative fecundity was 141 eggs/g body wet weight (ranging from 113 to 201). The absolute increase in weight of gonads is related to the age of the fish. The spawning period is from the middle of March to the beginning of April, at a mean water temperature of 8°C.
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