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中华鲟仔鱼初次摄食时间与存活及生长的关系
引用本文:庄平,章龙珍,张涛,张征,曹文宣.中华鲟仔鱼初次摄食时间与存活及生长的关系[J].水生生物学报,1999(6).
作者姓名:庄平  章龙珍  张涛  张征  曹文宣
作者单位:中国科学院水生生物研究所!武汉430070,中国水产科学研究院长江水产研究所,荆州434000,中国水产科学研究院长江水产研究所!荆州434000,中国水产科学研究院长江水产研究所!荆州434000,中国水产科学研究院长江水产研究所!荆州434000,中国科学院水生生物研究所!武汉430070
基金项目:国家自然科学基金(39870126),中国水产科学研究院科研基金(99—01—61)资助
摘    要:研究了延迟投饵对中华鲟开口仔鱼存活及生长的影响。初次开口摄食在11—12日龄,13日龄卵黄基本吸收完毕,营养完全依靠外界供给。12日龄后,延迟投喂时间在1—10天的范围内,仔鱼成活率在46.67—73.33%之间,各组间无显著差异;延迟投喂时间为11d,成活率下降至13.3%;延迟投喂时间为12d,成活率为0。此外,延迟投喂时间在8d(20日龄)之内,42日龄后测量,仔鱼体长和体重与对照组无明显差异;延迟投喂超过9d,则体长和体重的指标明显低于对照组。仔鱼不摄食可以存活的最长时间是42日龄,但延迟投喂12天(24日龄)以上即发生不可逆转饥饿,故其饥饿的不可逆点(PNR)是24日龄。

关 键 词:中华鲟  仔鱼  初次摄食  存活  生长

EFFECTS OF DELAYING FIRST FEEDING TIME ON THE SURVIVAL AND GROWTH OF LARVAL CHINESE STURGEON, ACIPENSER SINENSIS
Zhuang Ping"',Zhang Longzhen,Zhang Tao,Zhang Zhengz and Cao W.n.u..l..EFFECTS OF DELAYING FIRST FEEDING TIME ON THE SURVIVAL AND GROWTH OF LARVAL CHINESE STURGEON, ACIPENSER SINENSIS[J].Acta Hydrobiologica Sinica,1999(6).
Authors:Zhuang Ping"'  Zhang Longzhen  Zhang Tao  Zhang Zhengz and Cao Wnul
Institution:Zhuang Ping"',Zhang Longzhen2,Zhang Tao2,Zhang Zhengz and Cao W.n.u..l.
Abstract:The paper deals with the effects of delaying first feeding time on the survival and growth of larval Chinese sturgeon, Acipenser sinensis. The larvae start initial feeding at the age of 11-12 days. After the age of 13 days, the larvae live on exterior nutritious materials while the yolk is absorbed absolutely. When initial feeding was delayed less than 10 days, the survival rates of the larvae were between 46.67-73.33 % , and did not show obvious differences with contrast group. However, the survival rate dropped to 13. 3% and 0% if the initial feeding was delayed 11 and more than 12 days respectively. In other hand, the growth of the larvae could be the same as the contrast group while the initial feeding was delayed within than 8 days, and was less than the contrast group if the initial feeding was delayed over 9 days. The larvae could survive up to the age of 42 days without feeding. But, if the initial feeding were delayed over 12 days (corresponding with the age of 24 days), the larvae would not be survival in the future. That means the point-of-no-return (PNR) of the larval Chinese sturgeon was at the age of 24 days.
Keywords:Acipenser sinensis  Larvae  Initial feeding  Survival  Growth
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