University of Exeter scientists let fish design ideal mates over nine generations
Researchers at the University of Exeter used virtual screens to observe how green swordtail fish refined their mate preferences across nine generations.
Virtual dating experiment setup
Scientists placed green swordtail fish in tanks with screens displaying different virtual mates at either end. Each time a fish chose a favorite, the winning virtual fish survived and was paired with another winner to create new offspring.
Male and female preferences
Males consistently chose larger females during the trials while females showed much more individual variation in their choices. Some females favored longer tails or brighter colors rather than just size.
Genetic algorithm method
Genetic algorithms created new sets of options for fish to choose from in each round of trials. This approach allowed the animals to refine their preferences without the limitations of presenting only a limited range of potential mates.
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