关键词: 洛氏鱥, 繁殖力, 体长, 体重, 成熟系数, 肥满度

Abstract: The individual fecundity was studied in minnow Phoxinus lagowskii Dybowskii collected in Suifen River in Heilong River Valley, and the relationship between the individual fecundity and the biological indices were evaluated to understand the reproductive biology of the minnow. The results showed that the minnow had average absolute fecundity of 6738.50 eggs/fish, range from 1636.67 eggs/fish to 11623.33 eggs/fish，heavily distributed in the range of 5000~9000 eggs/fish. And the average relative fecundity of 74.39 eggs/g body weight, range from 37.03 to 95.35 eggs/g, and heavily distributed in 50~90 eggs/g. The individual relative fecundity in body length was ranged from 109.30 to 571.62 (average 360.08) eggs/cm, mainly in 250~450 eggs/cm. The absolute fecundity and relative fecundity in body length were found to be very significantly increased with the increase in body length, body weight, maturity coefficient, and condition factor (P<0.01). There was no significant relationship of the relative fecundity in body weight with body weight and condition factor (P>0.05), but with significant relationship of the relative fecundity in body weight with body length (P<0.05) and with very significant relationship of the relative fecundity in body weight with maturity coefficient (P<0.01).