Production Characteristics and Changes in Fatty Acids Profiles of Nile Tilapia (Oreochromis niloticus) Using Algae as a Food Source in Partitioned Aquaculture System

Authors : Alp Yalçın TEPE

Pages : 211-217

View : 13 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Small insert ignore into journalissuearticles values(57.56 ± 0.03 g); and large insert ignore into journalissuearticles values(172.46 ± 1.14 g); Nile tilapia fingerlings insert ignore into journalissuearticles values(Oreochromis niloticus); were stocked in six 0.15 ha partitioned aquaculture system insert ignore into journalissuearticles values(PAS); units on May 1 1997 at a rate of 100 kg/0.15 ha insert ignore into journalissuearticles values(low density); and 200 kg/0.15 ha insert ignore into journalissuearticles values(high density); in triplicate to determine the growth rates and production characteristics and the changes in fatty acid profiles of the fish. The primary food source for the 152-day rearing period available to the fish confined within the raceway sections was planktonic algae and to a lesser extent zooplankton and possibly drifting invertebrates. At harvest the mean net production was 2.017 ± 212.4 kg/ha for the high density and 2.298 ± 178.9 kg/ha for the low density treatment. The average weight insert ignore into journalissuearticles values(g); of the small tilapia was significantly larger in the low density treatment. Total fat content decreased from 11.6% to 6.2% in the large fish and from 8.6% to 6.2% in the small fish and fatty acid profiles changed in the fish flesh during the study. The percentage of both Omega-3 and Omega-6 fatty acids increased over the sampling months. The ratio of Omega-3 to Omega-6 fatty acids also increased from 0.35 to 0.56 in the large fish and from 0.44 to 0.60 in the small fish during the study.
Keywords : Tilapia, Oreochromis niloticus, fatty acids, partitioned aquaculture system PAS, , stocking rate