mouthbreeder in a sentence

1. Gafftopsail catfish spawn over inshore mudflats during a relatively short time span ( 10 days ) from May to August; they are mouthbreeders.
2. Aside from 15 months he spent studying the mouthbreeder in Nigeria, Aronson did most of his research at the museum, sometimes with unexpected consequences.
3. Aronson, who received his doctorate from New York University in 1945 and later served as an adjunct professor there and at City College, was so fascinated by what made creatures tick that he spent years studying the African mouthbreeder, a fish whose males incubate fertilized eggs in their mouths until they hatch, then spit out the fry _ and eat any that do not swim away fast enough.
4. It's difficult to find mouthbreeder in a sentence.