In fish, light (photoperiod, intensity and spectra) is main regulator in many physiological actions including growth. We investigate the effect of light spectra on the somatic growth and growth-related gene expression in the rearing tiger puffer. Fish was reared under different light spectra (blue, green and red) for 8 weeks. Fish body weight and total length were promoted when reared under green light condition than red light condition. Expression of somatostatins (ss1 and ss2) in brain were showed higher expression under red light condition than green light condition. The ss3 mRNA was observed only higher expression in blue light condition. Expression of growth hormone (gh) in pituitary was detected no different levels between experimental groups. However, the fish of green light condition group was showed more high weight gain and feed efficiency than other light condition groups. Our present results suggest that somatic growth of tiger puffer is induced under green light condition because of inhibiting ss mRNA expression in brain by effect of green wavelength.

• Byeong-Hoon Kim(Marine Science Institute, Jeju National University)
• Sung-Pyo Hur(Jeju International Marine Science Research & Logistics Center)
• Sang-Woo Hur(Aquaculture Management Division, National Institute of Fisheries Science)
• Chi-Hoon Lee(1Marine Science Institute, Jeju National University)
• Young-Don Lee(Marine Science Institute, Jeju National University) Corresponding Author