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| 饥饿对条纹锯■仔鱼的存活、摄食及生长的影响 |
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贾瑞锦1,2, 陈 超1,2, 孔祥迪1,2, 李炎璐1,2, 宋振鑫1,2, 吴雷明1,2, 王 鲁1, 曲江波3, 赵从明4, 吴 坚5
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1.中国水产科学研究院 黄海水产研究所;2.上海海洋大学 水产与生命学院;3.烟台开发区天源水产有限公司;4.天津立达海水资源开发有限公司;5.浙江海生源生物科技有限公司
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| 摘要: |
| 为了确定条纹锯■(Centropristis striata)仔鱼的不可逆点(PNR), 作者在温度(22.9±0.8)℃、盐度30～32、DO≥5.0mg/L、pH7.8～8.2, 光照强度40～100 Lx 条件下, 对人工孵化的条纹锯■仔鱼开展饥饿胁迫对其存活、摄食、生长的变化规律的试验研究及影响。结果显示, 仔鱼在孵化后2 d 开口摄食, 仔鱼体长开始下降, 从内源营养期转入混合营养期, 持续1 d; 3 d 时卵黄囊、油球消失, 仔鱼体长增加, 进入外源营养期, 初次摄食率可达到68.25%。3.5 d 时初次摄食率最高达到88.24%, 之后初次摄食率逐渐下降, 5 d 时初次摄食率下降为37.5%, 可知条纹锯■PNR=5 d。6.5 d 时试验组仔鱼全部死亡。结果表明,内源营养期对照组与试验组无显著差异, 对卵黄囊与油球的利用率相似。混合营养期, 仔鱼体长出现负增长, 且试验组负增长速率明显高于对照组。外源营养期, 试验组仔鱼体长持续下降, 至PNR 时体长负增长速率加快死亡率增加, 直至全部死亡; 对照组仔鱼体长开始增长, 死亡率逐渐下降并趋于稳定。条纹锯■仔鱼孵出后2～5 d 为摄食的关键时期。 |
| 关键词: 条纹锯■(Centropristis striata)仔鱼 饥饿 摄食 不可逆点 |
| DOI：10.11759/hykx20130125001 |
| 分类号: |
| 基金项目:科技部国际合作项目(2012DFA30360); 天津市滨海新区资助项目(201004070) |
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| Effects of starvation on suriving, feeding and growth of the Yolk-sac larval of Centropristis striata |
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| Abstract: |
| In order to find the point-of-no-return of black seabass, the yolk-sac larval of Centropristis striata was used to explore the variation of suriving, feeding and growth at (22.9±0.8)℃ with salinity 30-32, DO≥5.0 mg/L, pH 7.8～8.2, and light intensity 40～100 Lx. The results showed that, the larval grouper started feeding at the 2nd day past hatching (dph) and the nutrition-mixture stage just lasting one day because the yolk sac and oil globules assimilated down at the 3rd dph. First feeding rate was 68.25% at the 3rd dph and reached the peak of 88.24% at the 3.5th dph. The initial feeding rate reduced to 37.5% which was as low as half of the peak when the larval grouper was 5 days old so the PNR is 5d. All of the fishes died when they were 6.5 days old. The analysis indicates that the endogenous vegetative stage of the grouper had no significant difference between control group and the experimental group. The mixotrophic stage total length had negative growth and a negative growth rate was significantly higher in the experimental group. In exogenous nutrition stage, the total length of experiment group continued to decline until they were died. So we can see, that the growth mode of the yolk sac larvae in control group could be divided into three stages: the rapid growth of endogenous nutrition stage, weak to negative growth of mixed nutrition stage and the normal growth exogenous nutrition stage. The growth mode of the experimental group could be divided into four stages: the rapid growth of endogenous nutrition stage, weak to negative growth of mixed nutrition stage, negative growth stage when the larva could be fed and the negative growth stage when the larva could not be fed. The key period of feeding of yolk-sac larval of Centropristis striata is in 2nd-5th dph. |
| Key words: Centropristis striata larvae starvation feeding the point-of-no-return(PNR) |