The chemical products are responsible for an improvement in the productivity in the hatcheries because they provide a greater larval survival and a better alimentary efficiency and reduce the stress in the transport of animals, by increasing the load / weight ratio of structures and materials. However, many of these operating procedures use synthetic chemicals, which end up negatively impacting the environment and animal and human health due to their ecotoxicity.
This research was carried out to evaluate the incorporation of Inmuplus Nutraceutical as an additive in the diet for rainbow trout fry being carried out in the facilities of the Gruta Milagrosa fish farm, where 24,000 fingerlings of rainbow trout Oncorhynchus mykiss were used. Three treatments were performed (TC = 0ml, T1 = 2ml and T2 = 4ml) with 2 repetitions. 4000 thousand fry with an initial wet weight (average ± standard deviation) of 1.083 g ± 0.019 g and a length of 4.81 cm ± 0.075 cm, were randomly placed in 6 ponds of 1.3 mt3 with a flow rate of 0.8 l / s. The fish were fed with a feeding rate (3-6%) of 4-6 times per day. At the end survival rate, specific growth rate, graph s of relationship between weigth and size , water quality analysis (O2, NH3 and pH) were determined. A tendency of an improvement in the rate of survival of T2 treatment compared to TC and T1 treatment. No significant changes were found (p ˂ 0.05) between the control group and the experimental groups in the other productive parameters. The results show a possibility of using a concentration of 4 ml / kg for the first 90 days of the alevinaje stage of Oncorhynchus mykiss.