投喂频率对斑点叉尾鮰幼鱼生长、饲料利用和鱼体组成的影响

通过8周的生长试验,研究斑点叉尾鮰(Ictalurus punctatus)幼鱼(初始体重约4.5 g)的最适投喂频率。试验饲料为自制配合饲料,粗蛋白38%,总能19.0 kJ/g。设计了1～5次/d(M1-M5)5种投喂频率。结果表明:M2、M3、M4组摄食率均显著高于M1和M5组(P<0.05),其中M4组最大。M3、M4、M5组的特定生长率均显著高于M1组(P<0.05),其中M3组最大。M2、M3、M4、M5组的干物质表观消化率均显著高于M1组(P<0.05),M3和M4组的蛋白和能量表观消化率均显著高于M1和M2组(P<0.05)。M3组干物质含量显著高于M1和M2组(P<0.05),M2、M3、M4和M5组的粗蛋白、粗脂肪和能量含量均显著高于M1组(P<0.05)。因此,本研究建议,斑点叉尾鮰幼鱼养殖的最适投喂频率为3次/d。

Effect of feeding frequency on growth, feed utilization and whole body composition of juvenile channel catfish( Ictalurus punctatus )

An 8-week growth trial was conducted to investigate the optimal feeding frequency for juvenile channel catfish(Ictalurus punctatus).One experimental diet(38% crude protein,19.0 kJ/g gross energy) was formulated for the fish.Five feeding frequencies were tested: 1 meal/d(M1),2 meals /d(M2),3 meals/d(M3),4 meals/d(M4) and 5 meals/d(M5).The growth,feed utilization and whole body composition of the fish were investigated after this period.The results show that feeding rates of fish fed at M2-M4 were significantly higher than those of fish fed at M1 and M5(P<0.05),and the fish fed at M4 obtained the highest value.Fish fed at M3-M5 showed significantly higher specific growth rate than that in fish fed at M1(P<0.05),and the fish fed at M3 obtained the highest value.The ADCd of fish fed at M2-M5 were significantly higher than that of fish fed at M1(P<0.05),ADCp and ADCe of fish fed at M3 and M4 were significantly higher than those of fish fed at M1 and M2(P<0.05).Fish fed at M3 showed significantly higher dry matter content than those in fish fed at M1 and M2(P<0.05),while fish fed at M2-M5 showed significantly higher crude protein,crude lipid and energy contents than those in fish fed at M1(P<0.05).Results of the present study suggest that the optimal feeding frequency was 3 meals /d in the culture of juvenile channel catfish.