An evaluation of the growth-promoting effects of green light on spotted halibut for its practical application in aquaculture

We examined the effects of tank color and stocking density on the growth of spotted halibut ( Verasper variegatus ) under a green light-emitting diode (LED). Fish reared for 40 days under a green LED (10 μmol m –2 s –1 at the water surface) grew faster than those reared under a white LED, irrespective of tank color (white or black). Green light promoted higher growth than indoor room light when fish were kept for 32 days under both the tested stocking densities, 4.3 kg m –2 and 13 kg m –2 , but stocking density alone did not affect fish growth. These results suggest that a growth-promoting effect of green light can be expected within the range of stocking densities applied here for fish housed in both black and white tanks.