紫萍替代饲料对罗非鱼鱼种生长的影响  

Effects of giant duckweed DW2602 as feed supplement on the growth of tilapia fingerlings

作　　者：杨乔乔 韩冰莹[2] 于博涵 赖杭桂[1] 张家明[2,3] YANG Qiaoqiao;HAN Bingying;YU Bohan;LAI Hanggui;ZHANG Jiaming(School of Tropical Crops,Hainan University,Haikou,Hainan,570228;Institute of Tropical Bioscience and Biotechnology,Chinese Academy of Tropical Agricultural Sciences,Haikou,Hainan 571101;School of Life Sciences,Nanjing Agricultural University,Nanjing 210059,China)

机构地区：[1]海南大学热带作物学院,海口570228 [2]中国热带农业科学院热带生物技术研究所,海口571101 [3]南京农业大学生命科学学院,南京210059

出　　处：《热带生物学报》2023年第4期451-457,共7页Journal of Tropical Biology

基　　金：中国热带农业科学院基本科研业务费专项资金项目(1630052020022,1630052020020)。

摘　　要：为了探讨紫萍(Lemna polyrhiza)替代饲料对罗非鱼(Oreochromis mossambicus)鱼种生长的影响,在传统罗非鱼饲料中分别添加0、10%、15%、20%、25%、30%的紫萍DW2602干粉,按照鱼体质量2.5%、3%和4%的投喂量饲喂罗非鱼鱼种40 d,对罗非鱼的增重率、特定生长率、肥满度和脏体比等生长指标进行了测定。结果表明,添加紫萍DW2602饲料粗蛋白含量提高了4.3%,粗脂肪含量下降了0.9%,赖氨酸含量无明显变化,含硫氨基酸即蛋氨酸和胱氨酸总量增加了0.1%。当浮萍替代率为20%、投喂量3%时,促进生长作用最显著,与投喂普通饲料相比,增重率提高了57.5%,特定生长率比对照组提高30.3%,肥满度和脏体比分别比对照组下降6.4%和5.5%。说明传统饲料中添加适当比例的紫萍干粉,能促进罗非鱼生长。Leaf meal of giant duckweed(Lemna polyrhiza)variety DW2602 was used as a feed supplement in the conventional tilapia feed at a rate of 0,10%,15%,20%,25%and 30%,respectively,and fed to tilapia fingerlings at the feeding rate of 2.5%,3%,and 4%of tilapia body weight for 40 days.The growth indexes of the tilapia fingerlings fed with the giant duckweed leaf meal as feed supplement,such as weight gain,specific growth rate,condition factor,viscerosomatic index,etc.were determined.The results indicated that the tilapia fingerlings fed with the tilapia feed supplemented with the giant duckweed leaf meal increased their crude protein content by 4.3%,reduced their crude oil by 0.9%,and enhanced their sulfur-containing amino acids(methionine and cysteine)by 0.1%as compared to those fed only with the conventional feed,and that no obvious change was measured in their lysine content.The giant duckweed leaf meal used as feed supplement promoted the growth of tilapia(P<0.05).The conventional feed supplemented with 20%of giant duckweed leaf meal at a feeding rate of 3%of the tilapia body weight significantly promoted the growth of tilapia,and increased tilapia weight gain by 57.5%and the specific growth rate by 30.3%and reduced the condition factor and viscerosomatic index by 6.4%and 5.5%,respectively,as compared to the 100%conventional feed.This indicates that supplement of giant duckweed leaf meal in the conventional tilapia feed at a given rate promotes the growth of tilapia.

关 键 词：浮萍 紫萍 植物蛋白源 鱼饲料 罗非鱼 

分 类 号：S965.125[农业科学—水产养殖]