Oxidative stress in tissues of gilthead seabream (Sparus aurata) and European seabass (Dicentrarchus labrax) juveniles exposed to ultraviolet-B radiation

Ultraviolet-B (UVB) radiation generates reactive oxygen species (ROS), which damage DNA, proteins, and lipids in aquatic organisms, including fish. This study evaluated UVB-induced oxidative stress several tissues of two marine teleosts, gilthead seabream (Sparus aurata) European seabass (Dicentrarchus labrax). Juveniles both were exposed to four treatments simulating underwater UVB (no, low, moderate, high UVB) doses for 6 weeks. Oxidative (the activities antioxidant enzymes (catalase, CAT; glutathione-S-transferase, GST; superoxide dismutase, SOD, lipid peroxidation, LPO) analyzed the skin, liver, head kidney, gills, muscle, brain, intestine, spleen, kidney samples obtained at increasing exposure times (3–43 days). induced significant responses tissues, with skin showing more pronounced effects S. aurata than D. labrax. In liver labrax, LPO levels significantly increased intensity time. CAT activity was inhibited (i.e., brain) SOD decreased labrax; however, prolonged time required gills aurata. GST reduced early aurata, whereas noted brain end experiment. An interactive effect between observed (seabream seabass) (seabass). Our results indicated that is as well indirectly labrax after subsurface transparent seas.