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| Artificial Propagation and Fry Rearing of Sleeper Odontobutis y alunensis |
| WANG Xinrong,XU Zhongyuan,LUO Xiaonian,LI Jun,ZHANG Xiaofeng |
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Abstract The artificial propagation of sleeper Odontobutis yalunensis as an economically important freshwater fish remains to be a bottleneck for development of sleeper culture in China .The preliminary research on the artificial propagation technology and fry culture of the sleeper was conducted in Xinbin county ,Liaoning province from 2009 to 2010 .A total of 1030 pairs of sleeper broodstock were induced to spaw n by hormone injection in 2009 ,with spaw ning success of 76 .9% ,and average fertilization rate of 80% .A total of 5 .2 × 104 fry were produced with average hatching rate of 21% ,and then 2 .1 × 104 fingerlings with average total body length of 3 .15 cm were obtained after 30~60 day rearing .In 2010 ,204 pairs of sleeper broodstock were induced to spawn and produced 12 .9 × 104 eggs by the improved method , with average spawning success of 82 .5% ,and average fertilization rate of 84% .A total of 9 .2 × 104 fry were produced with the average hatching rate of 83 .6% ,and 5 .4 × 104 fingerlings with average total body length of 3 .20 cm were obtained after 30~60 day rearing .The findings show that the sleeper spawn as early as in the middle of April in Liaoning province at the minimal water temperature of 8 ℃ .The best artificial propagation of sleeper was found under twice induction by LHRH-A2 + DOM at a dose of (6μg/kg + 4 mg/kg) per kg body weight .The hatching rate was improved by over 4 times by a new simple and efficient incubation method .The fry was fed Cladocera and Limnodrilus and began to cannibalize after the fish had total body length of 1 .2 cm .
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Received: 25 November 2013
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