Retinomotor and Stress Responses of Marbled Sole Pseudopleuronectes Yokohamae Under the LEDs
Retinomotor and stress responses were examined under different LED spectra (blue, green and red), as well as under complete darkness and sunlight (control) for the marbled sole Pseudopleuronectes yokohamae juveniles to grasp bases for better culture condition, particularly toward prevention of the biting behaviour in hatchery. No difference was observed between green and control in the both responses, meaning that the retina under green were completely light-adapted. Cortisol concentrations in the peripheral blood plasma suggested the significantly higher stress level under red, while lower under blue and green. The present study demonstrated green was most suitable for the retinal light adaptation, and implied that green and blue were expected to reduce stress of fish.
KeywordsPseudopleuronectes yokohamae Retinomotor response Stress response LED
Dr T. Azuma kindly gave us a lot of precious comments and suggestion to complete this manuscript. Dr. K. Sawada generously allowed us to use his LED light system. Dr. Y. Taga helped us for blood samplings. The authors would also like to thank Drs. T. Watanabe, S. Akeda, and Y. Ueno for their support to the present study.
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