Effect of light intensity and photoperiod on Japanese eel growth and animal welfare in recirculating aquaculture system
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1.Key Laboratory of Exploration and Utilization of Aquatic Genetic ResourcesShanghai Ocean University,Ministry of Education,1.Key Laboratory of Exploration and Utilization of Aquatic Genetic ResourcesShanghai Ocean University,Ministry of Education,1.Key Laboratory of Exploration and Utilization of Aquatic Genetic ResourcesShanghai Ocean University,Ministry of Education,Philips Lighting aquaculture, AE Eindhoven 5656, the Netherlands,Philips Lighting aquaculture, AE Eindhoven 5656, the Netherlands,Philips Lighting aquaculture, AE Eindhoven 5656, the Netherlands

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    Abstract:

    To explore the impact of light on the growth and animal welfare of Japanese eel(Anguilla japonica), the eel were cultured at different light intensity and light photoperiod in recirculating aquaculture system (RAS). This study was designed with the light intensity (10 lx, 100 lx, 300 lx) combining with the photoperiod (12L:12D, 18L:6D, 24L:0D) according to double-equation irrepetitive testing method. Growth indexes, routine blood physiochemical and cortisol levels were measured. The results showed that the final weight gain and daily gain of the 10 lx group were significantly lower than those of 100 lx and 300 lx (P <0.05). There was no significant difference in the survival rates of all groups at different intensity. The specific growth rate of 10 lx group was significantly lower than that of the 300 lx group (P <0.05). While the growth efficiency and feed conversion ratio of 300 lx group was significantly better than those of 10 lx group and 100 lx group (P <0.05). The final weight gain and daily gain of the 12L:12D and 18L:6D groups were significantly lower than those of the 24L:0D group (P <0.05), while the specific growth rate of 18L:6D group was significantly lower than those of 12L:12D and 24L:0D groups (P <0.05). The activities of glutamic oxalacetic transaminase of the 24L:0D and 12L:12D groups were significantly lower than 18L:6D group (P <0.05), and the activities of glutamic-pyruvic transaminase of 10 lx group conditions were significantly higher than that of 100 lx group (P <0.05). Triglyceride of 24L:0D group was significantly higher than the 12L:12D group (P <0.05). The SOD activity of 18L:6D group was significantly higher than 12L:12D group at 10lx and 300 lx (P <0.05), while the opposite of those at 100 lx. Light intensity and photoperiod have a significant difference (P <0.05) for serum cortisol of Japanese eel, 12L:12D was significantly lower than 18L:6D and 24L:0D groups at 10 lx and 300 lx. While the 12L:12L and 18L:6D group was lower than 24L:0D at 100 lx (P <0.01). The 10 lx group was significantly lower than 100 lx group in 12L:12D and 24L:0D, while the opposite of those in 18L:6D. So in RAS, the best welfare conditions for the growth of Japanese eel were 300 lx and 12L:12D.These conditions could reduce the stress of fish, and promote the development of eel industry.

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王奎,李慷,刘利平.循环水养殖模式下光照强度和光周期对日本鳗鲡生长及动物福利的影响[J].上海海洋大学学报,2018,27(5):683-692.
WANG Kui, LI Kang, LIU Liping. Effect of light intensity and photoperiod on Japanese eel growth and animal welfare in recirculating aquaculture system[J]. Journal of Shanghai Ocean University,2018,27(5):683-692.

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History
  • Received:March 22,2018
  • Revised:May 08,2018
  • Adopted:June 07,2018
  • Online: October 22,2018
  • Published:
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