Case study on depuration of RAS-produced pikeperch (Sander lucioperca) for removal of geosmin and other volatile organic compounds (VOCs) and its impact on sensory quality

Effect of depuration on content geosmin in pikeperch (Sander lucioperca) produced a commercial RAS farm was examined during 15-day period. Concentrations the fish were related to water. For depuration, half water volume 230 m3 production tank replaced daily with geosmin-free After 8 days and absence feeding, reduced from 710 ± 245 ng/kg 165 50 (mean SD, p < .01). Additional for 7 only 135 24 ng/kg. Geosmin concentration initially 34 ng/L but declined 10 after 15 days. Changes concentrations indicated that released by depuration. In addition removal geosmin, also decreased 28 different volatile compounds fish. Sensory analysis showed decrease intensity flavor upon improved overall sensory quality 2 weeks Our study shows other off-flavors can efficiently be removed level is below threshold most consumers.