Abstract
Rose bitterling Rhodeus ocellatus ocellatus gained most of its annual growth in both length and weight from April to early autumn, with little or no growth during winter. The growth rate was highest in the younger fish groups, and, the mean daily growth rate in weight was 0.015%, 0.011%, and 0.006% per day for 20-30mm, 30-40mm, and greater than 40mm SL fish groups, respectively. The decline in the growth rate with size is clearly marked in spring and summer when growth was most rapid.Seasonal changes in biomass and production occur, and in general, biomass and production are maximum in summer when growth is also maximum. The monthly mean individual weight range was 784-1, 230mg. The monthly mean biomass was 11.7-35.0kg for a 200-meter shoreline. The daily production range was 85-689g/day. The monthly production range was 2.4-16.3kg/month and the total annual production for a growth period of 209 days was 61.3kg for the above mentioned area or 307kg/hectare.It is concluded that, in summer, as a result of recruitment, the population size increases and higher individual weight due to the high growth rate during this season results in higher fish biomass and production.
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