Effects of varying protein level in practical diets on survival,growth, feed utilization and body composition of juvenile tench (Tinca tinca L.) |
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Authors: | Á. González-Rodríguez J. D. Celada J. M. Carral M. Sáez-Royuela J. B. Fuertes |
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Affiliation: | 1. Dpto. de Producción Animal, Facultad de Veterinaria, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain
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Abstract: | The aim of this study was to evaluate the effects of practical diets with different protein content on survival, growth, feed utilization and body composition of juvenile tench (Tinca tinca). A 90-day experiment was conducted with 6-month-old juveniles (34.35 mm total length, 0.411 g weight). Six practical diets differing in the protein level were tested: 40, 44, 48, 52, 56 or 60 %. Survival rates ranged from 96.7 to 100 %. The 52 % protein enabled the highest growth (55.49 mm total length, 2.11 g weight, 1.80 % day?1 specific growth rate) and the lowest feed conversion ratio (1.61) without significant differences (P > 0.05) from the 48 %. Protein productive value ranged from 15.64 to 22.01. The percentages of fish with visible deformities ranged from 1.1 to 4.4 %. The relationship among amino acid profiles of the diets, growth of juveniles, body composition and amino acid requirements of other fish species is discussed. Second-order polynomial regression analysis showed that the optimum dietary protein requirement for maximum growth of juvenile tench may be 52.7 %. |
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