The trend of keeping fish in aquarium started 4500 years ago by Sumerians, they used to keep fishes in artificial ponds. Goldfish was one of...
The trend of keeping fish in aquarium started 4500 years ago by Sumerians, they used to keep fishes in artificial ponds. Goldfish was one of the first fish breeds introduce for fish keeping. But they used to die with few days due to lack of oxygen, So later different designed tanks and filters were introduced for a suitable environment.
Anabantoidei is a species of fish that breathe through the intestine, they can use atmospheric oxygen as they come top of the surface and use atmospheric oxygen. These species do not require artificial oxygen machines in an aquarium. But you must keep open space on top so they can breathe through the atmosphere.