Groups of fish are called a school of fish or a shoal of fish.
example: The school of fish swam upstream.
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Fish in aquariums often swim in the same direction due to a phenomenon called schooling behavior. It is a natural instinct for many fish species to swim together in groups for protection and efficiency. In an enclosed environment like an aquarium, this behavior can be more pronounced as the fish mimic each other's movements.
The word for swim for a fish is "swim." Fish swim by moving their bodies and fins to propel themselves through the water.
Apparently, it's just called a school, just like any other fish.
Fish swim in schools.
Sharks are fish. Fish swim in 'schools'. Whales and dolphins are mammals. These swim in 'pods'.