The effect of different dietary protein and lipid levels on growth performance in Caspian Kutum (Rutilus frisii kutum, Kamensky, 1901)

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Abstract

A feeding trial with three protein levels (30, 35 and 40%) and three lipid levels (10, 12 and
14%) was conducted to evaluate the optimum protein and lipid ratio of Caspian Kutum
(Rutilus frisii kutum). Six hundred and seventy five fish (1.15±0.01g mean ±SD) were
randomly distributed in 27 aquaria (45L) and were fed four times daily for 8 weeks. Results
showed that interaction between protein and lipid did not significantly affect the growth
parameters. Weight increased with increasing dietary protein level up to 35%, and then
decreased significantly. Specific growth rate (SGR) and average daily growth (ADG) of fish
fed the diets containing 35 and 40% protein increased with increasing lipid level, but protein
efficiency ratio (PER) of fish decreased with increasing dietary protein level. Fish fed the diet
containing 40% protein and 10% lipid showed the lower protein productive value (PPV).
Lipid efficiency ratio (LER) of fish fed the diets containing 30 and 35% protein decreased
significantly with increasing lipid level (p< 0.05). Lipid production value (LPV) of fish fed
the 35% protein and 10% lipid was higher than those of other treatments. Results regarding to
the analysis of body compositions showed that dietary protein levels made no significant
differences among treatments, but the increase of lipid level in diets led to fish body lipid
increase and the highest amount of lipid were observed in fingerlings fed 35% protein and
14% lipid. Survival was 100% in all treatment. In conclusion, it appears that Caspian Kutum
juveniles could adapt to 14% dietary lipid without negative effects on growth and the diet
containing 35% protein with 14% lipid would be suitable for optimum growth of Caspian

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Iranian Scientific Fisheries Journal
Volume 22, Issue 1 - Serial Number 82
September and October 2013
Pages 101-116

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