Open AccessEffects of Light Intensity on the Growth Performance and Stress Response in Striped Knifejaw, ( Oplegnathus fasciatus )
Author(s) -
Biswas Amal,
Takii Kenji
Publication year - 2016
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/jwas.12313
Subject(s) - photoperiodism , biology , zoology , light intensity , fish <actinopterygii> , feed conversion ratio , weight gain , fight or flight response , body weight , growth rate , significant difference , endocrinology , medicine , fishery , biochemistry , botany , optics , physics , geometry , mathematics , gene
Six light intensities (50, 100, 200, 400, 800, and 1500 lx) were used under a photoperiod of 16 h light : 8 h dark ( 16L : 8D ) to investigate the growth performance and stress response of striped knifejaw, Oplegnathus fasciatus . Forty juveniles of mean weight approximately 27 g were randomly distributed into each of eighteen 300 L tanks, fed to apparent satiation two times a day for 8 wk. At the end of the rearing trial, there were no significant differences in final mean weight, weight gain, specific growth rate, condition factor, and survival among the treatments ( P > 0.05). Although there was no significant difference in feed intake, fish exposed to 50–200 lx showed significantly higher feed efficiency ( FE ) compared to that of other treatments ( P < 0.05). There was a decreasing trend in retention efficiency of protein and lipid with increasing light intensities (400–1500 lx), but there were no significant differences among the treatments. There were no significant differences in plasma levels of cortisol, glucose, and total protein among the treatments ( P > 0.05). To consider the FE and given the fact that an intensity of 50 lx is insufficient to monitor fish activity during feeding, light intensity of 100–200 lx would be better for rearing of striped knifejaw.