plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Deni Aulia1·김하함1·전현철1·허준혁1·Abayomi O. Ogun1·이승형1,2*
1국립부경대학교 수산생물학과 양식응용생명과학전공, 2국립부경대학교 사료영양연구소
γ-aminobutyric acid (GABA) is a feed additive recognized for its role in stress regulation in fish. This study investigated the effects of dietary GABA supplementation on the salinity tolerance of juvenile olive flounder Paralichthys olivaceus. Three diets were prepared: a control diet (CON), and two diets supplemented with 210 mg kg-1(GABA210) and 630 mg kg-1 (GABA630) of GABA, with actual contents measured as 72.5, 303, and 781 mg kg-1, respectively. Olive flounders (initial weight 23.5±0.1 g) were distributed among 9 tanks. After the 8-weeks of feeding trial, growth performance was evaluated, followed by a salinity exposure trial at levels of 5, 15, and 35 ppt for 120 h. No significant differences in growth performance were observed between the groups (P>0.05). Notably, plasma metabolites, such as glutamic oxaloacetic transaminase, glucose, and potassium were significantly higher in GABA630 fish (P<0.05). Despite the lack of mortality during the exposure trial, GABA supplementation did not significantly affect the osmoregulatory measurements. Ultimately, juvenile olive flounder maintained osmoregulatory homeostasis in low-salinity conditions but showed no significant improvement with GABA supplementation.
Climate change, Gamma-aminobutyric acid, Osmoregulation, Salinity stress