Growth and digestive enzymes of silver catfish fed diets containing fruit residue

ABSTRACT In fish farming, the use of alternative ingredients has been studied, so that alternative sources can be used to minimize feed costs. This study evaluated the incorporation of grape, orange, guava, and fig residues in diets for silver catfish and its effects on growth, digestive enzymes and body composition. A total of 180 fish (initial mean weight = 22.93±0.75 g) were reared in a recirculation aquaculture system. There was no difference (P>0.05) in the parameters of growth, dry matter, mineral matter, plasma protein, cholesterol, triglycerides, lipase, and trypsin of fish. Glucose levels were higher in fish fed diets containing fig, orange, and grape residue (P<0.05). Lipase activity was higher in fish fed orange residue, compared to guava (P<0.05). Diets containing guava and fig provided more body protein in silver catfish. The fish fed with diet containing orange residue had a higher content of body lipids. It can be concluded that the tested fruit residues can be used in silver catfish feeding.

摘要 在水产养殖领域，为最大限度降低饲料成本，学界已围绕替代饲料原料的应用开展诸多研究。本研究评估了葡萄、柑橘、番石榴及无花果残渣在银鲶（silver catfish）饲料中的添加效果，及其对鱼类生长性能、消化酶活性与体成分的影响。试验共选取180尾初始平均体重为22.93±0.75 g的银鲶，于循环水养殖系统（recirculation aquaculture system）中饲养。结果显示，试验鱼的生长性能参数、干物质、矿物质、血浆蛋白、胆固醇、甘油三酯（triglycerides）、脂肪酶（lipase）及胰蛋白酶（trypsin）活性均无显著差异（P>0.05）。投喂添加无花果、柑橘及葡萄残渣饲料的试验鱼血糖水平显著升高（P<0.05）。与番石榴残渣组相比，投喂柑橘残渣组的试验鱼脂肪酶活性更高（P<0.05）。添加番石榴与无花果残渣的饲料可提升银鲶体蛋白含量，而投喂添加柑橘残渣饲料的试验鱼体脂含量更高。综上，本试验所测试的各类水果残渣均可应用于银鲶的饲料配制。