杜氏鰤人工苗养殖生物学特性及养殖技术研究

报道杜氏鰤(Seriola dumerili)人工苗养殖生物学特性及养殖技术研究结果。在海区水温6-30．5℃。海水盐度14．33，溶解氧6．5-7．3mg／L，pH7．5-8．1，水流为15-35cm／s的网箱中，杜氏鰤人工苗叉长40-50mm，体质量1．5-1．7g，经208d养殖，叉长达到330-388mm，体质量达到950-1400g，饲料系数为11，成活率为71．7％；养殖720d，体质量达4．5-6．5k，饲料系数为8；养殖l080d，体质量达7．5-11．5kg，饲料系数为7；养殖l440d，体质量达13．，15．5k异，饲料系数为6；养殖l800d，体质量达15．5-18．5kg，饲料系数为5。第4年性腺发育成熟，4-5月份，海上网箱人工催产，平均每尾雌鱼可产卵1．8kg左右。

STUDIES ON THE BIOLOGICAL CHARACTERISTICS AND CULTURAL TECHNIQUE OF ARTIFICIAL SEED OF Seriola dumerili

This paper reports the biological characteristics and cultural technique of artificial seed of Seriola dumerili. During the experiment periods the range of temperature was 6 ~ 30.5 C , salinity 14 ~ 33, dissolved oxygen (Do) 6.5 ~ 7.3 mg/L, pH 7.5 ~ 8.1, and flow rate 15 ~ 35 cm/ s. The results showed that by marine cage cultured for 208 d, the artificial fingerlings of Seriola dumerili grew from 40 ~ 50 mm to 330 ~ 388 mm, its weight from 1.5- 1.7 g to 950 ~ 1 400 g, and the feed coefficient was 11, survival rate 71.7% ; cultured for 720 d, 1 080 d, 1 440 d, 1 800 d, grew to 4.5 - 6.5 kg, 7.5- 11.5kg, 13- 15.5kg, 15.5- 18.5kg, and the feed coefficients were 8, 7, 6, 5 respectively. At the 4th year the sex gland was mature. By artificially induced spawning in marine cage, the mature female fish spawned about 1.8 kg eggs each from April to May.