军曹鱼人工繁育试验研究

在广西海洋研究所分别进行室内和室外军曹鱼人工繁育试验。从海南、福建挑选亲鱼并育肥，注射激素使亲鱼产生精、卵，让卵自然受精。室内用网箱流水、黑桶充气和苗池充气等方式孵化受精卵，室外在池塘网箱中孵化受精卵，仔鱼开口后将其从网箱放出。仔鱼开口后及时投喂合适的饵料，培育30d后出苗。结果获得优质受精卵158．5万粒，孵化出仔鱼148．8万尾，孵化率93．8％，室内3种孵化方式中，网箱流水效果较好。室内育苗平均成活率12．61％，室外育苗平均成活率7．52％，室内培育比室外培育的平均成活率高5．08％。

Artificial Breeding of Rachycentron canadum

Artificial breeding and larva-rearing of Rachycentron canadum were conducted indoors and outdoors,respectively,in Guangxi Institute of Oceanology.The parent fish were selected in Hainan and Fujian.After a period of breeding,the parent fish were injected hormone and produced sperms and egg cells,then egg cells inseminated naturally.The zygotes were hatched indoors by three means,including cage with running water,black bucket with full air and nursery pond with full air,on the contrary outdoors by cage in tank.When the larvae began to eat,they were let out from the cage,bred with good fit bait and harvest after 30 days.In results,we obtained 1.585×106 zygotes of high quality,1.488×106 larvae and the hatching rate reached 93.8%.Meanwhile,the cage with running water proved better among three means indoors.The average survival rates of the fry were 12.61% indoors and 7.52% outdoors,thus the survival rate indoors was 5.08% higher than that outdoors.