Induced swimming reduced stress and modulated immune response and antioxidant status in juvenile rainbow trout (Oncorhynchus mykiss).

ABSTRACT: Promoting swimming in aquaculture has been proposed to enhance fish welfare. This study investigated the effects of 6 h of swimming on stress, immune, metabolic, and antioxidant status of juvenile rainbow trout (Oncorhynchus mykiss). Fish (n = 8) were individually subjected to one of four experimental conditions: minimal water flow (control, < 0.1 body-lengths (BL)·s⁻¹); low-speed (L, 0.8 BL·s⁻¹); high-speed (H, 2.3 BL·s⁻¹); and oscillating speeds (O, 0.8/2.3 BL·s⁻¹). Plasma cortisol levels were lower in swimming groups (L, H, O) than that in the control group, indicating reduced stress. Lysozyme and peroxidase activities increased in skin mucus of fish from L and H groups, reflecting enhanced mucosal immunity. Expression of cytokines (tnfα, il1β

SUBMITTER: Espirito-Santo C 

PROVIDER: S-EPMC12394289 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature