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| Age and Growth of Crucian Carp Cauratus auratus in Caohai Lake |
| WANG Jin-na,ZHOU Qi-chun,AN Miao,TAN Bing-chang,TAI Ding-min |
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Abstract The age and growth of crucian carp Cauratus auratus found in alpine wetland Caohai Lake , Guizhou province ,were studied by scales as annual ring method .The results showed that there were 5 age classes ranging from 1 to 5 in the population of the crucian carp in CaoHai Lake ,with preponderant age classes of 1-3 years old ,accounting for 96 .34% of the total population .Most of the crucian carp had body length of 52 .0-240 .0 mm ,primarily within the range between 90 .0 mm and 150 .0 mm (81 .97% ) ,and body weight ranging from 4 .8 g to 582 .4 g ,mainly between 30 g and 120 g (83 .89% ) .The ratio of ♀ to♂was found to be 8∶1 ,more females than males in the crucian carp in CaoHai Lake ,and length-weight power function relationship of the crucian carp showed the exponent b =s with isometrical growth by scale annulus .The growth of the crucian carp was described as Von Bertalanffy equation ,with L∞ =259 .67 mm ,m∞ =481 .94 g ,k=0 .1537 ,t0 = -0 .6506 and body weight growth inflexion point of 6 .28 .Com-pared with 1980’s ,the simple age structure of the crucian carps in CaoHai Lake is featured by more small individuals and the declined population in the resources .
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Received: 25 September 2014
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