Impact of Salinity Changes on the Antioxidation of Juvenile Yellowfin Tuna (Thunnus albacares)

To understand the impacts of salinity stress on antioxidation yellowfin tuna Thunnus albacares, 72 fishes (646.52 ± 66.32 g) were randomly divided into two treatments (32‰ and 29‰) sampled at four time points (0 h, 12 24 48 h). The control group (32‰) was based natural filtered seawater (29‰) reduced by adding tap water with h aeration to seawater. superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), malondialdehyde (MDA) from liver, gill, muscle tissues used as antioxidant indexes in this study. results showed that changes SOD GSH-Px gills first not significantly different (p > 0.05) finally higher than (SOD: 50.57%, GSH-Px: 195.95%, p < 0.05). activity fish liver changed 0 0.05), between With increase time, MDA activities juvenile increased (GSH-Px: 113.42%, MDA: 137.45%) then −62.37%, −16.90%) levels similar group. white red decreased (white muscle: −27.51%, −15.52%) 7.30%, 3.70%) level 81.96%, 233.08%, 26.89%, 64.68%) −48.03%, −28.94%, −15.93%, −28.67%) observed present study indicate low may lead function juveniles. In contrast, juveniles have strong adaptability 29‰. However, excessive consume body’s reserves reduce resistance.