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| Growth and Development of Larvae and Juveniles in Puan Silver Crucian Carp Carassius auratus Linnaeus |
| LIANG Zhengqi,YAO Junjie,XIONG Hualong,AN Miao,HUANG Shihong |
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Abstract The growth and development of larvae and juveniles was morphologically investigated in Puan sliver crucian carp Carassius auratus Linnaeus .The results showed that it took 52 h from fertilization to hatching at 22 ~ 25 ℃ .The newly hatched larvae had transparent body ,with the head right near the yolk sac ,accounting for two-thirds of the body length ,which was exhausted in the 4 day old post-larvae which started the exogenous nutrient period .The post-larvae were found to develop into juveniles from a few scales on the 20th days after hatching to whole scales ,fingerling ,on the 28th day after hatching .The relationship between total body length (TL) and age in day (D) was described as :TL = 0 .0012D3 - 0 .0388 D2 + 1 .0432 D + 3 .9458(r2 = 0 .998) .The relationship between body length (L) and body weight (W) of the larvae and juveniles was expressed as :m= 1E - 0 .5L3 .3769 (r2 = 0 .9827) .The formula between body length and body height during the development of the fish was described as :H = 0 .0001L3 - 0 .0284L2 + 1 .2816L- 7 .2505 (r2 = 0 .9886) .The findings contribute to provide the theoretical instruction to fry and juvenile production of Puan sliver crucian carp .
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Received: 25 July 2013
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