摘要
在工厂化养殖条件下,将初始体长为(54.04±6.07)mm、体质量为(2.03±0.75)g的4000尾美洲鲥幼鱼放在有效体积约300 m 3的养殖池中饲养84 d,研究美洲鲥幼鱼养殖过程中的生长特性及生长过程中消化酶活力的变化特点。结果显示:美洲鲥体长(L)、体质量(W)均与养殖时长(t)呈指数相关(L=56.568e^(0.0088t),W=2.4633e^(0.0274t)),体长与体质量呈幂函数相关(W=7×10^(-6) L^(3.1582)),试验期间美洲鲥幼鱼的生长类型为等速生长;总体上,肥满度随着幼鱼的生长发育而明显提高,试验初期(养殖14 d时)显著提高,之后有所降低,在42 d时显著下降(P<0.05),之后幼鱼的肥满度保持着较快的增长,随着时间的推移显著提高(P<0.05),并在试验结束时达到最高值。美洲鲥幼鱼胃蛋白酶活力随着幼鱼的生长显著升高(P<0.05);幽门盲囊的淀粉酶活力随着幼鱼生长显著下降(P<0.05),而蛋白酶和脂肪酶活力总体呈升高趋势(P<0.05);肠道中淀粉酶的活力随着幼鱼生长而显著降低(P<0.05),蛋白酶和脂肪酶活力总体呈上升趋势,最大值均出现在第84天(P<0.05)。研究结果表明,工厂化养殖美洲鲥幼鱼的生长类型为等速生长,本试验的养殖条件适宜美洲鲥幼鱼生长;养殖过程中应根据消化酶的变化规律,适时调整饲料中营养成分的含量或添加生物酶制剂,以提高饲料的利用效率,提高养殖效益。
To investigate the growth characteristics and changes of digestive enzyme activities during the growth of American shad Alosa sapidissima,total of 4000 A.sapidissima fingerlings with initial body weight of(2.03±0.75)g were cultured in a factory farming pool(about 300 m 3 effective volume)for 84 days.The results showed that the body length(L=56.568e^(0.0088t))and body weight(W=2.4633e^(0.0274t))were exponentially correlated with culture time(t),while the body length and body weight showed a power function relationship(W=7×10^(-6) L^(3.1582)),represented growth in mass was isometric with body length.The condition factors increased with the growth but decreased significantly after 42 days culture(P<0.05),and then kept increasing(P<0.05).The pepsin activity of the juvenile A.sapidissima increased significantly with growth(P<0.05).In the pyloric caeca,the activity of amylase decreased significantly with growth(P<0.05),however,protease and lipase activity showed a general uptrend(P<0.05).The activity of intestinal amylase decreased significantly with A.sapidissima growth(P<0.05),while the activity of trypsin and pancrelipase presented an upward trend,and the maximum values were detected at 84 d(P<0.05).The results indicated that juvenile A.sapidissima showed an isometric growth in the factory farming pool,which is suitable for the growth of this species.According to the variation of digestive enzyme activities,dietary nutrient composition should be adjusted timely or supplemented with bio-enzyme preparation to improve the efficiency of feed utilization.
作者
税春
施永海
陆根海
徐嘉波
SHUI Chun;SHI Yonghai;LU Genhai;XU Jiabo(Shanghai Fisheries Research Institute,Shanghai Fisheries Technical Extension Station,Shanghai 200433,China)
出处
《水产科技情报》
2022年第5期266-271,共6页
Fisheries Science & Technology Information
基金
上海市科技兴农重点攻关项目(2021-02-08-00-12-F00788)。
关键词
养殖
美洲鲥
生长
消化酶
culture
American shad Alosa sapidissima
growth
digestive enzyme
