Abstract
Abstract Under experimental conditions the life cycle of Ophryotrocha labronica La Greca & Bacci can be completed at temperatures from 12to 28°C. The cycle is 83 days at 14.5 °C and 16.5 days at 28°C. Maximum growth rate occurs at 28 °C. Maximum fecundity and reproductive rate are obtained at 20°C and 23 DC, respectively. The temperature preference for reproduction is 21°C. At all temperatures the mortality rate of males is higher than that of females. In adults the best survival occurs in the lower part of the temperature range. For larvae and juveniles the best survival is obtained at 25°C. In spite of the high mortality and a low reproductive rate, 28°C appears to be close to the optimum temperature for a population of O. labronica. The negative factors are more than compensated for by the advantages of a short generation time.
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