Tilapia

Tilapia is the genus of a bunch of fish from Africa.
In the US,  Lepomis is the genus that has the same ecological niche.  Lepomis is the genus of the bluegill and all the many similar fishes
in North America.  Tilapia has one feature that seems strange in America.  All of the Tilapia species can use air to breathe.  None of the American fishes can use air directly,  but most of the fishes in central Africa can use air to support their life.  Why??

Much of Africa is a high altitude.  I taught at the Haile Sellasie College of Agriculture so many years ago that I met Haile Sellasie.
The College of Agriculture is at an altitude of 7000 feet.  The weather is what men were designed for.  The lake at the College had oxygen concentration  the same as lake Erie at its worst.  Not because of pollution, it was clean, but because of altitude and temperature.  In the US, High altitude lakes are very cold.  In Africa, 7000 foot altitude means 70 degrees.  Not cold at all.  But this means very low oxygen concentrations.  So fish from Africa, the Tilapias and the Clarius (Walking Catfish) generas have learned to breath air directly.  And this means that fish farmers can raise a lot of Tilapia in a pond that is too small.