Mutual interaction of salinity and dietary protein level on growth, survival and body composition of narrow clawed cray fish (Astacus leptodactylus)

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Abstract

In this study Astacus leptodactylus were tested for 8 week with three practical diets
containing three crude protein (30, 35 and 40%) and isoenergetic level (370kcal/100 g) in
fresh water and brackish water of Caspian Sea. In this test, 6 treatments were used with three
replicates in 18 fiberglass tank (110 liter). Each tank had 5 narrow clawed Cray fish (mean
(±SD) individual weight=17±2.3g) and totally 90 clawed Cray fish were stocking. Result
indicates mean weight of Cray fish in fresh water and brackish water were 14.82 and 12.73,
respectively, that were significantly different. The highest survival occurred in interaction
between protein (30%) and salinity (0) (95.55%) and lowest survival occurred in protein 40 –
salinity (12) that were significantly different. The highest specific growth rate (SGR), weight
gain (WG), Protein Efficiency Ratio (PER), Net Protein Utilization (NPU) and lowest Feed
Conversion Ratio (FCR), demonstrated that dietary (protein 30% and fresh water) which had
no significantly differences. Result of this study showed that the highest protein of body
composition were in practical diet containing 30% protein and 0 salinity (freshwater) that
were significantly different with other treatment.

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Iranian Scientific Fisheries Journal
Volume 21, Issue 2 - Serial Number 79
March and April 2013
Pages 41-52

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