Abstract
Experiments were conducted in heated and control ponds, aimed at determining variations in individual reproductive rhythms in tench, Tinca tinca (L). The number of spawnings of a population per season, varying from 3 to 9, showed a positive correlation with the sum of diurnal temperatures higher than 10°C, although the percentage of females participating in spawnings depended upon the pattern of temperature changes during this time. The variability of individual reproductive rhythms increased in seasons with greater temperature fluctuations. In consequence, the number of pausing females (not participating in spawnings) also increased, thereby lowering the increase of absolute fecundity resulting from the increased number of spawnings in higher temperatures. Similarly, duration of the prespawning period depended more upon the pattern of temperature changes at this time than upon temperature level.
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