What is the best way to promote fusion between two related populations of mosquitofish, one of which lives in a predator-rich pond and the other of which lives in a predator-poor pond?

Build a canal linking the two ponds that permits free movement of mosquitofish, but not of predators.

Explanation:

On the Bahaman island of Andros mosquitofish populations live in various, now isolated, freshwater ponds that were once united. Currently some predator-rich ponds have mosquito fish that can swim in short, fast bursts, while other predator-poor ponds have mosquito fish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquito fish exhibit exclusive breeding preferences.

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