사료 내 γ-aminobutyric acid 첨가가 치어기 넙치(Paralichthys olivaceus) 의 염분 내성에 미치는 영향
Effects of Dietary Supplementation of γ-Aminobutyric Acid on Salinity Tolerance in Juvenile Olive Flounder Paralichthys olivaceus
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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.
Abstract
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.