Fig. 5

Seasonal changes in plasma melatonin levels and melatonin receptor Mel1a 1.4 (mel1a 1.4) expression levels of female goldfish scales. (A) Plasma melatonin levels in goldfish at midnight (closed circle, each time point n = 4) and at midday (open circle, each time point n = 4) from March 2016 to June 2016. (B) mRNA expression levels of mel1a 1.4 of goldfish scales at midnight (upper graph; each time point n = 6) and at midday (lower graph; each time point n = 6) from March 2016 to June 2016. Different letters indicate significant differences (P < 0.05). The average expression on March 8 was set to 1.