Male fish that display a bright blue color attract more mates as well as more predators. Maintaining that blue gene in the population is an example of:

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Sexual selection is the process in which certain traits that increase an individual's chances of mating and reproducing become more common in a population over time. In this case, the male fish with the bright blue color are attracting more mates, indicating that females are selecting for this trait. However, this also makes them more visible to predators, so it is not necessarily beneficial for all individuals in the population to carry this gene. Therefore, the maintenance of the blue gene in the population is an example of sexual selection.

Male Fish That Display a Bright Blue Color Attract More