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Turkish Journal of Fisheries and Aquatic Sciences 2016, Vol 16, Num, 1     (Pages: 015-018)

Adaptation of Intensively Reared Pikeperch (Sander lucioperca) Juveniles to Pond Culture and Subsequent Re-Adaptation to a Recirculation Aquaculture System

Blecha Miroslav 1 ,Kristan Jiri 1 ,Policar Tomas 1

1 University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Zátiší 728/II, 389 25 Vodňany, Czech Republic DOI : 10.4194/1303-2712-v16_1_02 Viewed : 7657 - Downloaded : 6414 A combination of intensive rearing and pond culture was evaluated on its benefits for pikeperch year-round production. Fifteen hundred intensively reared juveniles (group IRJ) and 1500 pond-reared juvenile pikeperch as a control (group C) were divided into three batches and stocked into three ponds for 178-day long culture. Survival of fish in group IRJ was significantly higher (65.2 ± 15.9%) compared to group C (47.3±1.6%) (P<0.05). SGR (group IRJ = 0.018±0.012%.d-1; group C = 0.014±0.027%.d-1) and Fulton coefficient (FC for group IRJ = 1.02±0.13; FC for group C = 0.95±0.57) did not differ at the end of pond culture which included winter and spring seasons. After harvesting, fish from group IRJ were transferred to a recirculation aquaculture system and after a short adaptation period, they were fed with pellet feed. The duration of following intensive rearing in the RAS lasted 46 days. SGR was 0.732±0.441%.d-1, FCR = 2.1±1.2, FC = 1.20±0.09 and survival rate was 98.4±0.9% at the end of the 46-day rearing period. No difficulties were observed in adaptation of intensively cultured juveniles to pond conditions. During the study, it was obtained a high survival rate and excellent ability of pikeperch juveniles to consume dry feed after their re-adaptation to recirculation aquaculture system. Keywords : Intensive culture, pellet feed, pond rearing, survival