不同投喂-停喂时间对大口黑鲈摄食、生长和废物排放的影响

Effect of different feeding-feed deprivation time on feed intake, growth and waste output of largemouth bass (Micropterus salmoides)

在室内循环水水槽中进行8周实验以评价不同投喂-停喂时间对初始体质量为(14.4±0.3)g的大口黑鲈(Micropterus salmoides)摄食、生长、食物利用、鱼体组成和氮、磷废物排放的影响。采用单因素实验设计,设3个处理:一组正常投喂(S_0),另外2组分别投喂3 d停喂1 d(S_1)或投喂7 d停喂1 d(S_2)。结果表明:随投喂-停喂时间比例的减少,鱼摄食率、体质量增加、饲料系数均呈下降趋势,但处理组S_0、S_1和S_2之间在氮和磷保留效率、肥满度、肝体比、全鱼蛋白质和脂肪含量、氮和磷废物排放量方面无显著差异;实验结束时,S_0组最终体质量及体质量增加均显著高于S_2组(P<0.05),S_2组显著高于S_1组(P<0.05),投喂期间S_1组和S_2组的摄食率和特定生长率均低于同期S_0组,但饲料系数和氮保留效率与S_0组无显著差异。此外,S_1和S_2组在停喂后恢复投喂期间均表现出部分补偿生长,其机制是增加摄食。根据本实验结果,当在大口黑鲈池塘养殖中采用交替投喂和停喂策略时,合理的停喂-投喂时间应分别为13 d和1 d。

Compensatory growth is described as a phase of accelerated growth when the fish were under favorable circumstances after a period of growth depression,which was widely investigated in the past decades all around the world.Largemouth bass(Micropterus salmoides)is a carnivorous fish species of commercial importance to freshwater aquaculture industry,which is now widely cultured in Guangdong,Zhejiang and Jiangsu provinces.Researches about nutrition requirements have been established a lot in the past decades,however,quite rarely on compensatory growth and feeding regime of largemouth bass.In order to improve the feeding regime of largemouth bass,the research was conducted.