摘要
本文阐述了大连湾牡蛎胚胎发育速度和盐度变化对其胚胎及幼虫的影响。结果表明:在水温 21.2℃、盐度 31.26‰条件下,受精卵经 19小时 30分钟发育至 D形幼虫。其胚胎发育的有效盐度范围为17—39‰,最适盐度范围为22—34‰。在盐度22—36‰条件下,胚胎发育速度较快,均不超过20小时,超出此盐度范围,则孵化时间延长。面盘幼虫在盐度25.21—34.25‰间生长较快,平均口增长速度为 8.54—9.38 微米,且存活率均在 50％以上;逾此则生长速度和存活率均有不同程度的降低。
In this paper the effects of salinity on the rate for embryonic de-velopment of oyster (Ostrea talienwhanensis Crosse) and on the growth of the veli-ger are reported. At the temperature of 21.2℃ and the salinity of 31.26‰ ,the time ofthe embryonic development from fertilized egg to straight hinge larvae is nineteenhours and thirty minutes. The effective salinity range of the embryonic developmentof the oyster is 17--39‰ and the optimum salinity range is 22--34‰. Within thesalinity range of 22--36‰, the rate of the embryonic development is faster, andthe mean time of the embryonic development is no more than twenty hours. Thetime of the embryonic development will be delayed when salinity goes beyond thebounds of the optimum range. Within the salinity range of 25.21--34.25‰,the rateof growth of the veliger is faster, the daily growth of the larvae is 8.54--9.38 umand the velocity of the survival of the veliger is higher (the mean percentage isabove 50％). When salinity goes beyond the hounds of the optimum range, the rate of the growth and the survival of the larvae will be lower.
出处
《水产学报》
CAS
CSCD
北大核心
1992年第1期32-39,共8页
Journal of Fisheries of China
关键词
大连湾牡蛎
盐度
胚胎发育
幼虫
oyster (Ostrea talienwhanensis)
embryonic development
salinity
veliger
