STUDY ON THE GROWTH OF SILVER CARP AND BIGHEAD CARP IN DIANSHAN

Based on data of mark-release-recapture and gillnet surveys of Silver Carp(Hypophthalmichthys molitrix) and Bighead Carp(Hypophthalmichthys molitrix) in Dianshan Lake during 2006~2008,growth of Silver Carp and Bighead Carp were studied.Based on back calculation formulae of fish body length,the growth indexes of Silver Carp and Bighead Carp were calculated;the relations between weight and body length of Silver Carp and Bighead Carp and fat degree of Silver Carp and Bighead Carp in Dianshan Lake were also calculated.The relations between weight and body length of Silver Carp is W=6×10-5L2.8371,(n=216,R2=0.8886).The relations between weight and body length of Bighead Carp is W=5×10-5L2.8609,(n=55,R2=0.9747).Fat degree of Silver Carp in summer is: K2006=0.001913±0.000142,K2007=0.002165±0.000218,K2008=0.002115±0.000306,K2009=0.001966±0.000112.Fat degrees of Bighead Carp in summer are K2006=0.002129±0.000239,K2007=0.002346±0.000262,K2008=0.002382±0.000247,K2009=0.002436±0.000282.Compared with other water areas,growth speed of Silver Carp and Bighead Carp in Dianshan Lake is slower.