Effect of various diets on some growth indexes and the resistance percentage in Piranha fish (Pygocentrus nattereri)

چکیده مقاله

Many various factors affect the growth of fishes. In this case, the type of the consumed food is no doubt one of the most influential factors. In this study the effect of 17 different diets was studied on indexes of mean weight, percentage of weight growth, percentage of specific growth, extent of consumed food and the rate of survival of Piranha fish (Pygocentrus nattereri) in a 12-week period in a completely random trial. Each treatment had 3 repetitions, for this, we used aquarium with the same dimensions. All variables were designed the same for all treatments. Results showed that the type of the diet has a considerable effect on the indexes of mean weight, percentage of weight growth, percentage of specific growth, extent of consumed food and the rate of survival of Piranha fish, and the maximum of these parameters was found in live worm treatment (100%) and the minimum was related to the cow manure nutritious treatment (100%).

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