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

MARCOVAL, MARÍA A.; PAN, JERÓNIMO; DÍAZ, ANA C.; ESPINO, LAURA; ARZOZ, NATALIA S.; FENUCCI, JORGE 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 bioaccumulation of UV-absorbing compounds acquired through the diet, in larvae and postlarvae of Pleoticus muelleri, and to assess tissue antioxidant activity, survival, and development. Mysis stage I were exposed to two artificial radiation treatments: M-PAR (photosynthetically active radiation, range=400?700 nm) and M-PAR+UVR (280?700 nm). The experimental larvae received a mixed dietary treatment of Artemia persimilis and the microalga Pavlova lutheri, reared under two radiation regimes: PAR (D-PAR) and PAR+UVR (D-PAR+UVR). Shrimp from all treatments reached 8 d 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 with 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 in homogenates of PL8, decayed drastically under radiation treatmentM-PAR+UVRfedwith algae of theD-PAR+UVRtreatment. It is concluded that the bioaccumulation of UV-absorbing compounds and the highest antioxidant activity in PL could improve the biochemical and photophysiological responses of shrimp under UVR stress.