Fish Seldom show any type of parental care; the recently-hatched or newborn fish usually are still left by themselves! "Fish" isn't a proper taxonomic grouping in systematic biology. Amphibians, reptiles, birds and mammals all descended from lobe-finned fish. But using the phrase "fish" is so easy that we go on https://maps.app.goo.gl/9y4LfCmrsyYSbzTo6