Convergent evolution of body color between sympatric freshwater fishes via different visual sensory evolution.

In Nomorhamphus , there was a significant difference in body redness among populations ( p < 0.0001), although the interaction between population and sex was also marginally significant ( p = 0.0496).

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The LWS expression level showed a trend of positive and negative correlations with the relative body red area in males in Nomorhamphus ( r = 0.6969, N = 7) and Oryzias ( r = –0.5939, N = 7), respectively, although the correlations were not significant ( Nomorhamphus : p = 0.0818; Oryzias : p = 0.1597).

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