摘要
适宜的投喂频率是水产养殖中保障养殖对象正常生长、优化水产养殖经济效益的关键因素。以条纹锯鮨(Centropristis striata)幼鱼为实验对象,研究了胃排空率和不同投喂频率对其生长、存活率、饲料系数、营养成分及酶活性等相关指标的影响。结果显示,在水温22℃条件下,条纹锯鮨胃含物湿重在4 h内下降明显,随后下降趋于平缓,最后降到0;比较线性模型、指数模型和平方根模型3种数学模型拟合条纹锯鮨胃排空率的结果表明,平方根模型的拟合效果最好,方程为Y 0.5=2.050-0.084t。水温22~26℃条件下,设置4个投喂频率处理组:F1(1次·d^(-1))、F2(2次·d^(-1))、F3(3次·d^(-1))和F4(4次·d^(-1)),进行8周养殖实验。结果显示,条纹锯鮨幼鱼的体质量、增重率、特定生长率和肥满度均随着投喂频率增加而增加,且F1组与其他各组差异显著(P<0.05)。随着投喂频率的增加,饲料系数先降后升;其中,F1组饲料系数最高,F2组饲料系数最低。随着投喂频率的增加,各组鱼体内水分、灰分、粗蛋白、蛋白质效率和蛋白质生产值呈降低趋势,粗脂肪呈升高趋势。F1组血清总蛋白与其他各组间差异显著(P<0.05);白蛋白各组间没有显著性差异(P>0.05);F2组球蛋白最高,葡萄糖和甘油三酯值随投喂频率的增加而升高,谷丙转氨酶和谷草转氨酶值随投喂频率增加先升高后降低。综合胃排空率、生长性能、饲料系数、营养成分等指标,在本实验条件下,条纹锯鮨幼鱼的适宜投喂频率为2次·d^(-1)。研究结果可为养殖生产实践中饲料投喂频率管理提供理论指导。
The experiments were carried out on juvenile Centropristis striata.The gastric evacuation rate(GER)and effects of different feeding frequencies on growth,survival rate,feed coefficient,nutrient composition and enzyme activity were studied.Results showed that when the water temperature was 22℃,the wet weight of stomach content decreased significantly in 4 h,then decreased slowly,and finally reached 0.Three mathematical models,including linear model,exponential model and square root model,were used to fit the gastric evacuation rate.The square root model was more suitable for quantitative description of gastric evacuation curve.The equation was Y 0.5=2.050-0.084 t.Under water temperature 22-26℃,groups of different feeding frequencies were set:F1(1 time·d^(-1)),F2(2 times·d^(-1)),F3(3 times·d^(-1))and F4(4 times·d^(-1)).After 8 weeks of experiment,the final body weight,weight gain rate,specific growth rate and condition factor increased with the increasing feeding frequency,and there were significant differences between F1 and other groups(P<0.05).With the increase of feeding frequency,feed coefficient initially decreased and then increased.The feed coefficient of F1 was the highest and that of F2 was the lowest,and there were significant differences between F1 and F2,as well as between F1,F2 and other groups(P<0.05).With the increase of feeding frequency,water content,ash content,crude protein content,protein efficiency and protein production value of C.striata decreased,while crude fat showed an increasing trend,and differences among groups were significant(P<0.05).There were significant differences in serum total protein between F1 and other groups(P<0.05).There was no significant difference in albumin among groups(P>0.05);globulin of F2 was the highest;glucose and triglyceride content increased with the increase of feeding frequency;alanine aminotransferase content and aspartate aminotransferase content increased initially and then decreased with the increase of feeding frequency,and F3 was the highest.C
作者
彭志兰
李凌刚
郑圆圆
李伟业
柳敏海
PENG Zhilan;LI Linggang;ZHENG Yuanyuan;LI Weiye;LIU Minhai(Key Laboratory of Aquatic Germplasm Resource of Zhejiang Province,College of Biological&Environmental Sciences,Zhejiang Wanli University,Ningbo Zhejiang 315100,China;Zhoushan Fisheries Research Institute of Zhejiang Province,Zhousha Zhejiang 316000,China;Institute of Mariculture Breeding and Seed Industry,Zhejiang Wanli University,Ningbo Zhejiang 315100,China)
出处
《海洋渔业》
CSCD
北大核心
2021年第3期318-326,共9页
Marine Fisheries
基金
浙江省属高校基本科研业务费(SC1031980180780)
浙江省基础公益研究计划项目(LGN21C190011)
浙江省重大科技专项(2018C02SAA00108)。
关键词
条纹锯鮨
胃排空率
数学模型
投喂频率
Centroprostis striata
gastric evacuation rate
mathematical model
feeding frequency
