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投喂策略对圆口铜鱼幼鱼生长、消化酶及肝脏组织结构的影响

Effects of Feeding Strategy on Growth,Digestive Enzymes,and Liver Structure in Juvenile Coreius guichienoti
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摘要 为探究圆口铜鱼(Coreius guichienoti)苗种培育的适宜投喂策略,实验采用5×2双因子设计,通过8周的养殖投喂,研究投喂水平(1%、2%、3%、4%和5%)和投喂频率(2和3次/d)对圆口铜鱼幼鱼[初体重(4.91±0.11)g]生长、体成分组成、消化酶活性和肝脏组织结构的影响。结果显示,随着投喂水平的增加,圆口铜鱼的增重率和特定生长率显著增加,饲料效率随着投喂水平的增加而递增,但在投喂水平达到3%后趋于平稳。鱼体肥满度和脏体比随投喂频率的增加有降低的趋势,当投喂水平不超过3%时,3次/d投喂组的增重率、特定生长率和饲料效率均显著高于2次/d组。全鱼的粗脂肪含量随投喂水平的增加而增加,而全鱼的水分则显著下降。投喂水平对肝脏胰蛋白酶和脂肪酶具有显著影响,当投喂水平超过3%时,投喂水平升高显著降低了肝脏胰蛋白酶的活性,而在3次/d投喂组,肝脂肪酶随投喂水平增加呈先增加后下降的趋势。投喂水平、投喂频率以及二者的交互作用对圆口铜鱼前肠消化酶均无显著影响。随着投喂水平的增加,圆口铜鱼肝脏脂肪蓄积逐渐增多,并诱发脂肪肝,且在同一投喂水平下,3次/d组的脂肪肝症状较2次/d组的症状轻。综上所述,在本研究条件下,以3%的日投喂量每日投喂3次,最有利于圆口铜鱼的生长、消化及肝脏健康。研究结果可为圆口铜鱼苗种的养殖管理提供科学依据和技术支持。 The rare and endemic largemouth bronze gudgeon(Coreius guichenoti)inhabits the middle and upper reaches of the Yangtze River.It is a typical migratory river fish found in the vicinity of rapids.Over the years,the construction of water conservancy facilities and overfishing by humans have harmed the ecological habitat of this species,resulting in a considerable population decline.Thus,the largemouth bronze gudgeon has emerged as an important conservation objective and artificial stocking target for protecting and restoring the ecological environment in the Yangtze River Basin.Artificial stocking is one of the most effective methods for restoring the population of rare and endangered fish,and it is widely used domestically and abroad.Culturing a healthy and sufficient number of fry is critical to stocking success.In the production of largemouth bronze gudgeon,the formulation of an effective feeding strategy plays an important role.A scientific and reasonable feeding rate and frequency serve as guidelines for improving the production and quality of cultured fry,which directly impact the survival rate,growth performance,and feed consumption of fish.In order to determine the appropriate feeding strategy for improving fry breeding efficiency,an 8-week feeding trial in a 5×2 two-factorial design was conducted to investigate the effects of feeding levels(1%,2%,3%,4%,and 5%)and feeding frequency(2 and 3 times/d)on growth,whole-body composition,digestive enzyme activity,and liver structure of juvenile largemouth bronze gudgeons with an initial weight of(4.91±0.11)g.The results were as follows:After 8 weeks of culture,the survival status of largemouth bronze gudgeon in each treatment group was good.Only two fish mortalities were observed,one in each of the two feeding frequency groups at the 5%feeding level.There was no mortality in the other groups.Feeding level,feeding frequency,and the interaction of the two items had significant effects on the weight gain rate(WGR),specific growth rate(SGR),and feed efficiency(FE)of i
作者 赵煜 曲焕韬 陈沛 鲁雪报 郭柏福 文志豪 ZHAO Yu;QU Huantao;CHEN Pei;LU Xuebao;GUO Baifu;WEN Zhihao(Institute of Chinese Sturgeon,China Three Gorges Corporation,Yichang 443100,China;Hubei Key Laboratory of Three Gorges Projects for Conservation of Fishes,Yichang 443100,China)
出处 《渔业科学进展》 CSCD 北大核心 2024年第1期95-104,共10页 Progress in Fishery Sciences
基金 2021年金沙江溪洛渡向家坝水电站珍稀特有鱼类增殖放流站运行管理合同(Z422221002)资助。
关键词 圆口铜鱼 投喂水平 投喂频率 生长性能 消化酶 肝脏切片 Coreius guichenoti Feeding level Feeding frequency Growth performance Digestive enzyme Liver section
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