Perissodus microlepis is kissing fish because it presents frequency-dependent selection on the side of month. Frequency-dependent selection means the fitness of a phenotype declines if it becomes too common in the population. When there are more left-mouthed fish, right-monthed fish have more reproductive advantageous, and vice versa. I imagine because they have to kiss each other when they mate, so fish that reproduce have the opposite phenotype of that which are most common in the population. However, as the text mentions, the reason is that rich-monthed fish often attack others on the right, and left-monthed do the opposite. My imagination had just been broken. Why scientists think and analyze in such a cynical way? Maybe someday they will find out my interpretation is correct as well.
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