Salmon, bass, catfish, trout, sea bass, swordfish, marlin, tuna, sand sharks, hammerhead sharks (!), and MORE!
Goose is to flock as fish is to school. A flock is a group of geese, just as a school is a group of fish. Both terms describe a collection of animals of the same species that come together.
No, tuna is a separate species of fish.
The term fishes refers to more than one species of fish, as in "There are many species of fishes." That said you could have any of the combination. School of fish - a group of fish made up of a single species, School of fishes - a group of fishes made up of more than one species. Shoal of fish - group of fish of the same species moving in roughly the same direction. Shoal of fishes - group of fishes of different species moving roughly in the same direction.
Fish do not come from one source or one event. Early fish were small, jawless species that are now extinct. The first fish with jaws were Placoderms.
Shoal (Pronounced School)
Platypuses are carnivores. Fish species come as both carnivores herbivores and omnivores.
I am not aware of any "schooling" or "shoaling" fish that is not an egg layer. This would imply that these species of fish do not get pregnant.
There are several species of fish that are called "Tiger fish" they come from the Congo and Zambezi rivers and lake Malawi also in Africa.
Some species of fish are very smart and can be trained to do many things. Most species will recognise the person who feeds them and will come to the front of the tank when that person approaches.
Angel Fish are schooling fish and will hunt small fish and insect larvae as a group. They tend to separate into pairs when breeding but come back together as a shoal/school afterwards.
No, there are thousands of species of fish.
Pacific Salmon come to mind.