How do tropical fish recognize season? A comparative approach of tropical monsoon around the equator

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The aim of the present study was to clarify environmental factor(s) in relation to reproductive activity in tropical fish and to examine a possible mechanism that transduces environmental stimuli into the internal signal. Two spinefoots species used in the present study had a clear reproductive cycle that is closely correlated with tropical monsoon. During the spawning season, each species spawned around the species-selective lunar phase. We also focused on the expression of clock gene (Cry) in thehypothalamus of the goldlined spinfoot. The expression pattern of this gene fluctuated with lunar cycle and peaked around the first quarter moon, suggesting that clock genes is related to oscillation of lunar-related activity including reproduction.