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| Reproductive Biology of Crucian Carp Carassius auratus in CaoHai Lake |
| WANG Jin-na,ZHOU Qi-chun,AN Miao,TAN Bing-chang,TAI Ding-min |
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Abstract A total of 1136 individuals of crucian carp Carassius auratus were collected in CaoHai Lake in Weining in Guizhou province and dissected from October of 2011 to October of 2012 , in w hich 406 individuals were applied in reproductive biology research including spawning season ,and sexual ratio .The results showed that the crucian carp in CaoHai Lake spawned from February to May , especially in February and March .Nearly 13% of the female and 28% of the male were first matured in the 1-year group ,and all of the 2-year group were matured .The mature females had the minimum size of 81 .0 mm in total body length and 9 .6 g in body weight with gonado-somatic index of 15% ,and the males were found to be matured at total body length of 103 .0 mm and body weight of 17 .3 g with gonado-somatic index of 5 .4% .The absolute fecundity (F) was ranged from 13260 to 34838 eggs ,with average 20803 ± 9682 .45 . The relative fecundity to weight (FW ) was ranged from 198 to 320 .4 eggs/g with average (266 .43 ± 51 .87) eggs/g .The eggs had diameter from 0 .5 mm to 1 .5 mm .The breeding populations included five age old classes ,but most consisting of 2-age old and 3-age old individuals .There were 370 females and 36 males in the breeding populations , with ratio of female to male = 10 ∶ 1 , and 8 ∶ 1 in the normal population ,with more young and significant difference in sexual ratio .So it should be paid more attention to breed and protect the crucian carp in CaoHai Lake .
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Received: 25 December 2013
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