The effect of lysine amino acid on factors of growth and survival of gold fish (carassius aurtus)

The present study was conducted to examine the growth and survival of gold fish by adding Lysine Amino acid to fish food in the lab. Regarding the commercial importance of this species, in some months of the year, lysine amino acid was used as a supplement to the food. In this study, four treatments with three repetitions were tested. The control treatment was fed the typical food. In addition to the typical food, treatments 1, 2, and 3were each fed 1.5, 2 and 2.5 grams of lysine amino acid for 1 kilogram weight gained. It is worth mentioning that totally, 12 aquariums were used and each one was filled with five fries weighing 2.9 grams. The results of the study indicated that there is a significant difference between treatments regarding growth rate during the experiment (p<0.05) in a way that the three treatments considerably gained weight with a mean weight of 4.38 ± 0.20 in comparison with the control treatment with a mean weight of 2.96 ± 0.01. Treatment three (2.5 grams) obtained the best result compared to the others. Similarly, the results of the statistical analysis showed that lysine amino acid of 2.5 grams led to the reduction of mortality of fries. Also, it led to the highest increase rate in survival, percentage of weight gaining, special growth rate, protein return coefficient and reduction of food conversion coefficient (p<0.05). As a result, it can be concluded that lysine amino acid increases the growth to 2.5 as well as the survival of the fish.