摘要
对秦皇岛沿海捕获的松江鲈(Trachidermus fasciatus)亲鱼进行人工繁殖和育苗,并对其胚胎发育过程进行观察。结果表明:①经过14 d饲养,9尾松江鲈亲鱼(5♂/4♀)中,4尾雄鱼腹部可挤出精液,4尾雌鱼全部产卵,2尾在白天,2尾在夜间,且其中1尾分两次产卵。2尾雌鱼产卵于牡蛎壳中,另2尾则产卵于水族箱底壁上;②从雌鱼性腺解剖结果来看,其性腺成熟度均达到Ⅲ期以上,成熟系数在24.5%～34.0%之间;绝对繁殖力为1 274～5 439粒/尾,且与体重正相关;相对繁殖力为98～122粒/g;③松江鲈产粘性块状卵,橘黄色或淡黄色,卵径为1.45～1.60 mm。在人工充氧并保持水体流动的条件下,受精卵经过24～27 d相继出膜,孵化率达到74%;④松江鲈幼鱼的最佳淡化速度为0.005 g/(mL.d)。
Artificial reproduction and larva rearing of Trachidermus fasciatus captured from Qinhuangdao gulf were carried out,and embryo development were also observed.The results showed that ① After being cultured for 14 d,semen was able to be squeezed out of 4 male T.fasciatus among the 9 parents fish(5♂/4♀).2 female parents fish laid eggs in the daytime and another 2 at night,one female laid eggs twice.In addition,two female parent fish laid ova on oyster’s shell,but another two on the bottom of aquaria.②From the gonads of the four dissected female parents fish,the grade of maturity of gonads were all above III phase with maturing coefficients in the range from 24.5% to 34.0%;Absolute fecundity varied from 1 274 to 5 439,and that was positively related to body weight.Relative fecundity varied from 98 to 122 ind/g.③T.fasciatus reproduced adhesive and agglomerated eggs,which colored orange or yellowish with the diameter from 1.45 to 1.60 mm.Under the condition of increasing oxygen and keeping water flowing,zygotes hatched after 24～27 d,and hatching rate was 74%.④The optimum velocity of desalting of seawater was 0.005g/(mL.d).
出处
《湖北农业科学》
北大核心
2013年第11期2612-2615,共4页
Hubei Agricultural Sciences
