Innovation of aquaculture system of fish in the coastal water of Miyagi Prefecture
Period and Interval2015/04/01 - 2016/03/31
CategoryOthers(Innovation of Aquaculture System)
OverviewThis study aims the innovation of novel aquaculture system of salmonid fish. We are investigating the effects of specific light wavelengths on the somatic growth and metabolism of rainbow trout.
Results and Future PlanTo contribute to improving aquaculture environment, we have examined the effects of lighting condition on the growth and endocrine system in rainbow trout (Oncorhynchus mykiss).
1. After intermittent exposure (4 times of 1 hour exposure per day) of green or orange LED light in indoor tank, the green light group showed higher growth than the red light group and the control group (under ambient light without any LED light). This result suggests that continuous exposure might not be required for growth promotion using green LED light.
2. The effects of blue, green, and red LED light on the expression level of following hormones were examined; melanin-concentrating hormone (MCH, an orexigenic peptide), melanocyte-stimulating hormone (MSH, an anorexigenic peptide derived from proopiomelanocortin (POMC)), and growth hormone (GH, a growth-promoting peptide). Red light increased MCH mRNA content in the brain, while green light decreased POMC mRNA content in the pituitary. Blue and green light increased GH mRNA content in the pituitary compared to red light. These fluctuations in the expression of appetite/growth related hormones might be involved in the growth promoting effect of LED light.