International Journal of Innovative Studies in Aquatic Biology and Fisheries
Volume-2 Issue-3, 2016, Page No: 30-36
Growth, Survival and Fatty Acid Content of Astacus astacus (Linnaeus 1758) In a Water Recirculation System Fed a Semi- Purified Diet
MPanagiotis A. Pantazis1*, George Papadomichelakis2, John Ch. Karamaligas1
1.Department of Ichthyology, Aquatic Fauna and Fish Diseases, Faculty of Veterinary Medicine, School of Health Sciences, University of Thessaly, 224 Trikalon Street, Karditsa, Greece.
2.Laboratory of Animal Nutrition, Department of Animal Sciences and Aquaculture, Agricultural University of Athens, 75 Iera Odos street, Athens, Greece.
Citation : Panagiotis A. Pantazis , George Papadomichelakis , John Ch. Karamaligas Growth, Survival and Fatty Acid Content of Astacus astacus (Linnaeus 1758) In a Water Recirculation System Fed a Semi- Purified Diet International Journal of Innovative Studies in Aquatic Biology and Fisheries . 2016;2(3):30-36.
Continuous environmental disturbances and the crayfish plague have restricted freshwater crayfish populations in Greece. Therefore, the need for the establishment of a repopulation policy in Greece and the increasing commercial interest for the species dictated in the Thessaly County, have imposed the investigation of the optimum husbandry and dietary requirements of Astacus astacus in recirculation systems. Forty-five adult crayfish were placed in nine aquariums in individual chambers for hundred days and fed a semi-purified diet and a diet consisting of fresh fish and carrots. The semi-purified diet had a P: E ratio of 19.71 mg protein/Kj, a protein level of 38.8% and a lipid level of 13.08% (on a DM basis). Growth was significantly higher for the crayfish fed the semi-purified diet but more lipids were accumulated in their tail muscle tissue. By the end of the experiment tail muscle levels of EPA & DHA of both treatments were similar. The high levels of DHA (13-14 mg/100g) and arachidonic acid (ARA 36-41 mg/100g) of the tail muscle of all treatments in comparison to the ones of the wild stocks (6.32mg/100g and 13.23mg/100g respectively) suggest that the semi-purified diet has possibly been over-formulated in terms of corn oil and fish oil.