饥饿对唐鱼仔鱼摄食和生长的影响  

Effects of Starvation on Feeding and Growth of the Larvae of Tanichthys albonubes

作　　者：陈国柱[1] 方展强[1] 

机构地区：[1]华南师范大学生命科学学院,广州510631

出　　处：《动物学杂志》2007年第5期49-61,共13页Chinese Journal of Zoology

基　　金：广东省科技计划项目(No.2004B40101015);农业部渔业生态环境重点开放实验室;广东省渔业生态环境重点开放实验室开放基金(No.2005-9);广东省科技计划项目(No.2006B36601002)

摘　　要：用初次摄食率测定法测定饥饿胁迫下唐鱼（Tanichthys albonubes）仔鱼耐饥饿能力,观察了饥饿对仔鱼摄食、生长和形态发育的影响。结果表明,水温24.0-28.5℃条件下仔鱼在孵化后第2.5-3d开口摄食,初次摄食率为33.3%,最高初次摄食率为100%并持续4d;混合营养期约2d;第5d卵黄耗尽,并达到最高摄食强度;第8.5d进入不可逆点（PNR）,PNR有效积温为222.7d.℃,第10d死亡率超过50%,12d全部死亡。饥饿对仔鱼发育起延迟作用,混合营养期延迟投喂,仔鱼生长发育水平明显低于正常投喂仔鱼,饥饿仔鱼发育停滞且在PNR前后负增长并出现胸角。本文讨论了仔鱼耐饥饿能力与生境、生活史策略的关系。In laboratory conditions larvae of Tanichthys albonubes were reared in water at 24.0- 28.0℃ to exam the starvation tolerance and the changes in feeding ability, growth and morphological change under starvation condition during early development stage. The results showed that： the larvae had feeding ability first time 2.5 - 3 d after hatching; the initial feeding rate was 33.3 % ; the highest feeding rate was 100% and lasted 4 d ; the mixed feeding stage lasted about 2 d and yolk exhausted 5 d after hatching; while unfed larvae had the strongest feeding intensity; unfed larvae reached the-Point-of-No-Return （PNR） 8.5 d after hatching,and the sum of effective temperature of PNR was 222.7 d·℃ ;Death rate of unfed larvae beyond 50% 10 d after hatching and 2 d later they died totally. Feeding had strong effects to delay the growth and morphological development of the larvae, such as feeding delay in mixed feeding stage in which larvae growth rate was significant lower than that in feeding larvae. The unfed larvae growth was retarded also and even entered a negative growth phase while the pectoral angle of unfed larvae appeared before PNR stage. Relationships between larvae＇ s starvation tolerance and their ecological and life historical strategy were also discussed in this paper.

关 键 词：唐鱼 仔鱼 摄食率 摄食强度 不可逆点(PNR) 

分 类 号：Q41[生物学—生理学]