Herein, we demonstrated facilitation of growth by green light in the spotted halibut, Verasper variegatus, and Japanese flounder, Paralichthys olivaceus.
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green light
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Blue and blue-green light had growth-promoting potencies similar to green light, whereas red and white light were equivalent to ambient light control.
Blue and blue-green light showed potencies that were similar to that of green light, while the potencies of red and white light were equivalent to that of ambient light (control).
In spotted halibut, green light enhanced hypothalamic mch1 expression at all four tested water temperatures.
Among the genes encoding hypothalamic hormones, expression levels of melanin-concentrating hormone 1 (mch1) were enhanced by green light at the four water temperatures.
In spotted halibut, green light increased expression of some other hypothalamic hormone genes including mch2 at certain water temperatures.
Expression levels of other genes including mch2 increased at certain water temperatures.
The authors propose that MCH stimulated by green light may be a key hormone linking green light exposure to increased food intake and somatic growth.
Moreover, it is conceivable that MCH, production of which is stimulated by green light, is a key hormone; it augments food intake, which is intimately coupled with somatic growth.
Green light did not change expression of pituitary hormone genes including growth hormone and proopiomelanocortin family members, nor plasma levels of insulin family members, in spotted halibut.
No difference was observed in the expression levels of pituitary hormone genes, including those of growth hormone and members of proopiomelanocortin family, and in plasma levels of members of the insulin family.
Green light facilitated growth in spotted halibut and Japanese flounder.
Herein, we demonstrated facilitation of growth by green light in the spotted halibut, Verasper variegatus, and Japanese flounder, Paralichthys olivaceus.
In spotted halibut, green light increased condition factor at 15 and 18 °C.
Increase in condition factor was observed at 15 and 18 °C.
In spotted halibut, green light facilitated growth at four tested water temperatures: 12, 15, 18, and 21 °C.
Growth of the fish was facilitated by green light at four different water temperatures examined; the fish were reared for 31 days at 12 and 21 °C, and 30 days at 15 and 18 °C.