NUTRITIONAL STUDIES ON SOME MARINE INTENSIVE FISH CULTURE TECHNIQUES

Abstract

This study was conducted at the Fish Rearing Lab. at El-Mex Applied Research Station of the National Institute of Oceanography and Fisheries in Alexandria in 2015, in cooperation with the Faculty of Agriculture - Menoufia University, in order to carry out nutritional studies on some intensive marine culture techniques especially for Gilthead sea bream (Sparus aurata). The present work included three experiments on fry and fingerlings of Gilthead sea bream to study: O The effect of nursing methods and stocking density on the nursing of Gilthead sea bream using underground saline water. O The effect of some feed additives on the growth performance, dietary benefits and consumption of Gilthead sea bream, hapas or net-enclosures. O Effect of integrated multi-species culture on the performance parameters of Gilthead sea bream fingerlings. From the results of the three previous experiments, the following can be concluded: Nursing of Gilthead sea bream fish is better in hapas than in fiberglass tanks. The best density of gilthead sea bream fish culture is 100 fish / 2 m3. The addition of Aquagest® OMF (OA) as a source of organic acids to the Gilthead sea bream has improved its rate of growth and nutritional utilization compared to control treatment. Integrated multi-tropic Aquaculture (IMTA) systems improved the growth performance, feed utilization and condition factor of gilthead sea bream fish and obtained additional production of mullet and bivalves as well as increasing the economic yield of the farmer, thus achieving optimal utilization of the unit area (land and water).