Effect of diets containing various protein and energy levels on some growth parameters, survival and the production of Astacus leptodactylus in different salinities
A factorial experiment was conducted for 60 days to determine of the response of Narrow clawedcrayfish Astacus leptodactylus (average weight of 17±2.3 g) to diets containing various proteinand energy levels. Nine diets containing three levels of protein (30, 35 and 40 %) and three levelsof energy (300,370 and 450 kcal/100g) were formulated and prepared in this trial. Each diet alsowas used in two levels of salinity include 0 (fresh water) and 12 ppt(Caspian sea water).So this study was conducted with 18 treatments and triplicates random group of 5 crayfish pereach 110-litre tank. Weight Gain, Feed conversion ratio (FCR), Protein Efficiency Ratio (PER),Net Protein Utilization (NPU), Daily Food Consumption (DFC), Survival (SVR) and bodycomposition of tail-muscle meat of animal were determined.Comparing the growth parameters in response to interaction between protein, energy and salinitylevels demonstrated that all growth parameters have difference between them significantly(p<0.05). Comparing between survival in fresh and Caspian Sea water showed difference significantly.Compare the body composition results indicate the greatest amount of protein absorption in dietnumber 2(30/370) on fresh water condition. Results from this study indicate that narrow clawedcrayfish can be fed a practical diet containing 30% protein and 370 Kcal/100g on non-salinitywater which is the optimize CP percentage for their producer’s profits.
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| Format: | thesis biblioteca |
| Language: | Persian |
| Published: |
Islamic Azad University, Science and Research Branch, Tehran, Fisheries
2010
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| Subjects: | Aquaculture, |
| Online Access: | http://hdl.handle.net/1834/34448 |
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| Summary: | A factorial experiment was conducted for 60 days to determine of the response of Narrow clawedcrayfish Astacus leptodactylus (average weight of 17±2.3 g) to diets containing various proteinand energy levels. Nine diets containing three levels of protein (30, 35 and 40 %) and three levelsof energy (300,370 and 450 kcal/100g) were formulated and prepared in this trial. Each diet alsowas used in two levels of salinity include 0 (fresh water) and 12 ppt(Caspian sea water).So this study was conducted with 18 treatments and triplicates random group of 5 crayfish pereach 110-litre tank. Weight Gain, Feed conversion ratio (FCR), Protein Efficiency Ratio (PER),Net Protein Utilization (NPU), Daily Food Consumption (DFC), Survival (SVR) and bodycomposition of tail-muscle meat of animal were determined.Comparing the growth parameters in response to interaction between protein, energy and salinitylevels demonstrated that all growth parameters have difference between them significantly(p<0.05). Comparing between survival in fresh and Caspian Sea water showed difference significantly.Compare the body composition results indicate the greatest amount of protein absorption in dietnumber 2(30/370) on fresh water condition. Results from this study indicate that narrow clawedcrayfish can be fed a practical diet containing 30% protein and 370 Kcal/100g on non-salinitywater which is the optimize CP percentage for their producer’s profits. |
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