Comparison of the effects of feeding two different diets on the growth rates and survival of Zebrafish (Danio rerio)

The aim of this study was to compare the effects of feeding two different diets on the growth rate and survival of zebrafish in order to produce resistant and better-quality fish. For this purpose, two experimental diets with different levels of protein and fat were given to zebrafish (20 days old) five times a day for a period of 70 days (10 weeks). The results of this research showed that feeding with two rations with different levels of protein and fat on the indicators of length growth, weight growth has created a statistically significant difference among the treatments (P<0.05). Loss rate (survival), food conversion ratio, daily growth percentage and weight gain percentage are also highly significant (P<0.05). In total, fish fed with a diet with protein levels of 51.5% and 11.5% fat had better growth and survival rates than fish fed with protein levels of 40.2% and 7.7% fat. This proves that zebrafish has a high ability to use fat as an energy source. The use of appropriate levels of non-protein energy sources in the diet of this fish can reduce protein catabolism in order to produce energy, as a result, we will see an increase in the growth rate of length and weight in this fish.