Dietary photoprotective compounds ameliorate UV tolerance in shrimp (Pleoticus 1 muelleri) through induction of antioxidant activity

MARCOVAL, M.A.; PAN, J.; DÍAZ, A.C.; ESPINO, M.L.; ARZOZ, N.S.; FENUCCI, J.L.

JOURNAL OF THE WORLD AQUACULTURE SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2017

0893-8849

The aim of this study was to determine the effects of ultraviolet radiation (UVR) on survival, development, and bioaccumulation of UV-absorbing compounds acquired through the diet, in larvae and postlarvae (PL) of Pleoticus muelleri, and to assess antioxidant activity in tissue homogenates. Mysis I were exposed to two artificial radiation treatments: M-PAR (Photosynthetic Active Radiation, 400-700 nm), andPAR+UVR (280-700 nm). The experimental larvae received a mixed dietary treatment of Artemia persimilis and microalgae Pavlova lutheri, reared/cultivated under two radiation regimes: PAR+UVR (D-PAR+UVR), and PAR (D-PAR). Shrimps from all treatments reached postlarval stage (PL8), except those under M-PAR+UVR treatment fed the D-PAR-cultured algae, which had 0 % survival. Larvae in M-PAR+UVR and M-PAR treatments fed the D-PAR+UVR diet presented the highest survival rates (70 and 75 %, respectively), with 37 and 41 % increase in PL size. UV-absorbing compounds were detected in microalgae and PL subject to PAR+UVR treatments. Antioxidant activity, quantified by measuring the free-radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) in homogenates of PL8, decayed drastically under radiation treatment M-PAR+UVR fed with algae of the D-PAR+UVR treatment. UV-absorbing compounds bioaccumulated and the highest antioxidant activity in PL could benefit the biochemical and photophysiological responses of shrimps under stress by UVR.