Abstract
The effects of dietary calcium chloride (CaCl2) concentration on the growth, survival, moulting and body composition of Astacus leptodactylus were studied. Diets were prepared using supplementation of 0 (control), 30, 60 and 120 g kg−1 calcium chloride commercial trout larvae diet containing 50% protein and 12% lipid. Astacus leptodactylus larvae with an average total length of 22.0 ± 0.05 mm (TL) and weight of 0.53 ± 0.01 g obtained from eighteen ovigerous females collected from Seydisehir Sugla Dam lake in Konya, Turkey, were stocked in 0.2-m2 aquariums at a rate of 50 crayfish m−2 and reared for 90 days. The experiments included four treatments (diets) with three replicates each. Calcium chloride exerted positive effects on growth, moulting frequency, feed efficiency and survival of narrow-clawed crayfish. Crayfish fed with 60 g calcium kg−1 calcium chloride-supplemented diet exhibited the highest weight gain and specific growth rate (SGR) but the lowest survival rate (63.3%) (P 0.05) in mean moisture (803.5 g kg−1) and protein content (177.0 g kg−1) in crayfish tail meat. However, lipid values were between 3.8 and 11.6 g kg−1 and significantly different among the diets (P < 0.05). Diet with 60 g kg−1 calcium chloride is recommended for the best growth of freshwater crayfish.
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