Research
| Title： | Effects of light intensity on phototaxis, growth, antioxidant and stress of juvenile gibel carp (Carassius auratus gibelio) |
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| First author： | Wei, Hui; Li, Han-Dong; Xia, Yu; Liu, Hao-Kun; Han, Dong; Zhu, Xiao-Ming; Yang, Yun-Xia; Jin, Jun-Yan; Xie, Shou-Qi |
| Journal： | AQUACULTURE |
| Years： | 2019 |
| DOI： | 10.1016/j.aquaculture.2018.10.055 |
| Abstract： | To explore the effect of light intensity on phototaxis, growth performance and physiological condition of juvenile gibel carp, a short-term ethological experiment and a long-term cultivation experiment were carried out Light intensity generated by white light emitting diodes (LEDs) was graded during the whole experiment. In the ethological experiment, juvenile gibel carp (5.00 +/- 0.02 g) were exposed to light intensities of 0, 0.03, 0.09, 0.24, 0.56 and 1.06 mu mol.m(-2).s(-1) in a 6-cell behavior study facility. Gibel carp exhibited negative phototaxis in the short-term ethological experiment. In the long-term cultivation experiment, juvenile gibel carp (5.20 +/- 0.05g) were cultured under seven illumination levels (0, 0.03, 0.24, 1.08, 4.7, 9.46, 19.36 mu mol.m(-2).s(-1) in bottom water at a 0.5-m water depth) in an indoor recirculation water system for 70 days. The fish were fed to satiation three times daily (8:30, 14:30 and 18:30). The photoperiod was 12 L:12D (8:00-20:00). The results showed that the best growth of juvenile gibel carp were observed at 0.03-1.08 mu mol.m(-2).s(-1). The hepatopancreas oxidative stress of juvenile gibel carp were induced in a dark environment (0 mu mol.m(-2).s(-1)); plasma cortisol, glucose and lactic acid increased significantly when the light intensity increased to 9.46 mu mol.m(-2).s(-1). Based on the quadratic regression analysis of specific growth rate, the optimal light intensity for juvenile gibel carp was 0.39 mu mol.m(-2).s(-1). |
