摘要
饵料对鱼类生长发育和繁殖具有重要影响。为了筛选稀有鲫(Gobiocypris rarus)幼鱼和成鱼阶段最适投喂方式,实验将出膜5周末(日龄为35 day after hatching)的幼鱼随机分为5个组:A组投喂丰年虫;B组每周前6d(days)投喂丰年虫,后1d投喂商业化微颗粒S3饲料;C组每周前3.5d投喂丰年虫,后3.5d投喂饲料;D组每周前1d投喂丰年虫,后6d投喂饲料;E组一直投喂饲料;各组均采用饱食投喂策略。每2周统计生长、存活指标,直至第21周(147 dah),在17周(119 dah)取材用于观察性腺发育程度。在产卵后统计各组产卵量、孵化率和子代畸形率。结果显示:(1)E组存活率和特定生长率显著低于其他组(P<0.05);(2)从产卵量、孵化率和子代畸形率上看,B组产卵量显著高于其他组(P<0.05);(3)从性腺组织学上看,不同投喂方法对精巢的成熟度无显著影响,但投喂过丰年虫的稀有鲫卵巢发育成熟度显著优于E组。研究结果提示:适量加入丰年虫比单一投喂活饵或饲料更有利于稀有鲫的生长和繁殖。建议在标准化养殖过程中,幼鱼和成鱼期的稀有鲫采取丰年虫与饲料投喂频次比值为6﹕1的方式最佳。
In order to explore a proper bait of larva and adult fish Gobiocypris rarus,we randomly divided hatchetfish,35 day after hatching,into five groups:Group A was fed with Artemia nauplii;Group B was fed with A.nauplii for 6 days,and was fed with commercial micro pellet diet for 1 day per week;Group C was fed with A.nauplii for half a week,and was fed with artificial diet for another half a week;Group D group was fed with A.nauplii for 1 day per week,and was fed with artificial diet for 6 days per week;Group E was fed the artificial diet.Each group was fed with a feeding satiation strategy.Each 2 weeks,growth and survival indicators were counted until 21st week(147th day).Reproductive capacity and offspring abnormal rate were calculated after spawning.The gonads obtained in 17th week(119th day)were used for histological studies.The results showed that:(1)In group E group,survival and specific growth rates were significantly lower than other groups(P<0.05);(2)reproductive capacity of group B was significantly higher than other groups(P<0.05);(3)different feeding strategies had no significant effect on testis maturity,while had influence on ovarian maturation.The results of this study suggest that addition of A.nauplii contains superior results than single feeding with commercial micro pellet diet,which was more conducive to the growth and reproduction of G.rarus.We suggested that optimal feeding ratio for A.nauplii and commercial micro pellet diet is 6﹕1,that would be more appropriate for larvae and juvenile G.rarus in the process of standardized cultivation.
作者
赵月月
刘小红
王志坚
ZHAO Yue-Yue;LIU Xiao-Hong;WANG Zhi-Jian(Key Laboratory of Freshwater Fish Reproduction and Development(Ministry of Education),the Key Laboratory of Aquatic Science of Chongqing,School of Life Sciences,Southwest University,Chongqing 400715,China)
出处
《水生生物学报》
CAS
CSCD
北大核心
2018年第5期1003-1009,共7页
Acta Hydrobiologica Sinica
基金
重庆市教委项目(CY160219)资助。
关键词
稀有鲫
投喂方式
生长和繁殖
Gobiocypris rarus
Feeding strategies
Growth and breeding
