Background The aquaculture sector is the biggest consumer of fishmeal and the demand of this ingredient is higher than the production. The replacement of fishmeal from aquafeed is a current research thrust. The replacement of fishmeal has been possible with plant ingredients in many fish species, however, possesses some limitations in terms of low digestibility and inadequate nutrient profile. Results Complete replacement of fishmeal in the diets of Cirrihinus mrigala was studied using specially designed nutrient digestibility system. Two feeds were prepared, one with fishmeal as one of the ingredients (control feed) and another with complete plant ingredients (test feed). Initially, forty C. mrigala fingerlings with average weight of 10.88 ± 0.17 g were stocked in six tanks. Fish were fed up to satiation twice daily (10:00 and 16:30 h) for a period of 45 days. After 1 week of acclimatization, fecal samples were collected for 45 days. At the end of the experiment, no significant differences ( P > 0.05) were observed for somatic and serum parameters in two treatments. The digestibility coefficient of dry matter, protein, lipid and energy, and three digestive enzymes; amylase, proteases, and lipase did not differ significantly ( P > 0.05) between the treatments. The whole body proximate compositions were similar between the treatments. The test diet (containing linseed oil) fed group exhibited higher proportions of whole body linolenic acid (ALA, 18:3n-3). However, eicosapentaenoic acid (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3) did not vary in both studied treatments. Conclusion The information obtained from this study revealed that fishmeal can be completely replaced from the diet of C. mrigala without affecting their growth and nutrient digestibility and fatty acid composition.

中文翻译：

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鱼粉替代饲料对印度主要鲤鱼Cirrhinus mrigala营养消化率、消化酶活性和全身脂肪酸谱的影响

背景 水产养殖部门是鱼粉的最大消费者，对这种成分的需求高于产量。从水产饲料中替代鱼粉是当前的研究重点。许多鱼类可以用植物成分代替鱼粉，但在消化率低和营养成分不足方面存在一些局限性。结果 使用专门设计的营养消化率系统研究了在 Cirrihinus mrigala 日粮中完全替代鱼粉的情况。制备了两种饲料，一种以鱼粉作为成分之一（对照饲料），另一种以全植物成分（试验饲料）。最初，40 条平均重量为 10.88 ± 0.17 克的鱼种被放养在 6 个鱼缸中。鱼每天吃饱两次（10:00 和 16: 30 小时），持续 45 天。驯化 1 周后，收集粪便样本 45 天。实验结束时，两种处理的体细胞和血清参数均无显着差异（ P > 0.05）。干物质、蛋白质、脂质和能量以及三种消化酶的消化率系数；淀粉酶、蛋白酶和脂肪酶在处理之间没有显着差异（ P > 0.05）。治疗之间的全身邻近组成相似。试验饮食（含有亚麻籽油）喂养组表现出更高比例的全身亚麻酸（ALA，18:3n-3）。然而，二十碳五烯酸（EPA，20:5n-3）和二十二碳六烯酸（DHA，22:6n-3）在两种研究处理中没有变化。