Effect of protein and fat content in artificial feeds on productive and biological parameters of Tinca tinca
Abstract
The variety of technologies for growing tench ( Tinca tinca Linnaeus, 1758) is currently limited by the low intensity of pond aquaculture. However, the demand for it is growing and there is a need to study the physiological parameters that affect the well-being of tench during its more intensive cultivation. This study analyzed the growth intensity and the effect of different formulations of artificial feeds when growing age-1+ tench in a recirculating aquaculture system facility. Three 0.96 m 3 tanks were used for the study. The duration of cultivation was 225 days. The stocking density of age-1+ fish was 600 ind./m 3 . Three experiments were formed in which the artificial feed differed in protein and fat contents. Experiment I – artificial feed with 44% protein and 9% fat content; Experiment II – artificial feed with 46% protein and 10% fat content; Experiment III – artificial feed with 54% protein and 15% fat content. The experiments showed that the highest yield and maximum body weight were obtained in the experiment using artificial feed with 46% protein and 10% fat content. Accor d ing to the obtained survival rates and average body weight, the yield of age-1+ tench was 35.5–41.6 kg/m 3 , and the fish productivity of the tanks was within 30.6 – 36.7 kg/m 3 , the highest productivity being in experiment with a medium protein and fat content . The specific growth rate of age-1+ tench was maximum in the first two months of cultivation, and gradually decreased as they grew in October. The superiority of age-1+ fish fed with artificial feed with 46% protein content in terms of growth rate was noted only in April and June-July. Age-1+ tench of this experimental group also had a higher count of erythrocytes, neutrophils, basophils, platelets and hematocrit, as well as the relative content of neutrophils, monocytes and basophils. The analysis of blood serum showed that the content of urea, creatinine and the activity of transaminases and alkaline phosphatase in the experimental groups of tench did not have a direct dependence on the protein content in the diet of tench, but was defined by the generalized effect of the composition of each feed on protein metabolism. According to the results of the studies, it was found that the physiological needs of age-1+ tench for growing in conditions of recirculating aquaculture systems require artificial feeds with a protein content above 45% and below 10% fat.References
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