延迟首次投喂对南方鲇(Silurus meridionalis Chen)仔鱼身体含能量、体长及游泳能力的影响  

Effect delayed first feeding on the energy content,body length and swimming performance of southern catfish (Silurus meridionalis Chen) larvae

作　　者：张怡[1] 曹振东[1] 付世建[1] 

机构地区：[1]重庆师范大学进化生理与行为实验室

出　　处：《生态学报》2007年第3期1161-1167,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30371121);重庆市自然科学基金资助项目;重庆市教委科学技术研究资助项目~~

摘　　要：在(22.0±0.5)℃条件下,将人工孵化的南方鲇仔鱼分别于出膜后4、5、6、7天进行首次投喂(其中4d的为对照组),首次投喂前(出膜后4d)取样测量体长、体重、身体含能量作为初始值,于出膜后7d(延迟投喂实验)和21d(继续喂养实验)分别测定体长、体重、身体所含能量和临界游泳速度。结果显示:延迟投喂实验结束时各处理组的体重、身体含能量和体长随首次投喂时间的延迟均呈下降趋势,相对临界游泳速度随首次投喂时间的延迟表现为先提高后降低的趋势,绝对临界游泳速度在延迟投喂2d以内无显著差异;继续喂养实验结束时处理组各指标逐渐接近对照组水平,两种临界游泳速度表现为同步变化趋势;另外,体长特定生长率相对百分比(SGRL%)的变化幅度小于身体含能量特定生长率相对百分比(SGRE%)的变化幅度,而绝对临界游泳速度相对百分比(Ucrit%)的变化又小于体长特定生长率相对百分比的变化。结果表明:早期食物资源的短缺会导致南方鲇仔鱼体重、身体含能量产生明显变化,体长生长速度的变化则相对较小,而短期饥饿不会显著降低南方鲇仔鱼的游泳能力。Abstract： The endogenous nutrition period of fish larvae is considered critical for the early life stage of fishes. During the transition from endogenous nutrition to exogenous feeding, many fish larvae fail to initiate successful first feeding, which may lead to starvation, adverse growth, abnormal behavior even mortality. Swimming performance is an important parameter indicating the potential survival ability of many fish species due to its ecological relevance in animals＇predator avoidance and hunting success. However, limited information is available on the effect of the timing of first feeding on the swimming performance in fish larvae, and its relationship to energy content and body length. Southern catfish （Silurus meridionalis Chen） is widely distributed in the Yangtze and Zhujiang Rivers, where the food abundance experiences drastic seasonal fluctuation. Spawning in the early spring, the first feeding in larvae southern catfish coincide with one of the most unstable periods in terms of food availability. We suspect the plasticity of the timing of first feed in this species may be one of the keys to its success in its natural habitat. The current study is to swimming performance as an indicator to illustrate how energy content and body length. The effect of the timing of initial feeding （4, 5, 6 and 7 days post-hatch, dph） on energy content, body size and swimming performance of artificially fertilized southern catfish larvae were conducted at （22.0 ± 0.5 ）℃ in the Laboratory of Evolutionary Physiology and Behavior of Chongqing Normal University. Larvae were sampled and analyzed for energy content, body weight and length measurement before feeding at 4dph, and different delayed first feeding treatment at 7dph and 21dph. The critical swimming speed （Ucrit） of larvae with different delayed first feeding treatment were also measured at 7 dph and 21 dph. The parameter measured at 7dph showed that the energy content, body weight and body length of larvae had a tendency to decrease w

关 键 词：延迟首次投喂 体长 身体含能量 临界游泳速度 仔鱼 南方鲇(Silurus MERIDIONALIS Chen) 

分 类 号：S917.4[农业科学—水产科学]