Catfish also do not resemble in terms of appearance on what a common fish should look like. With more than 2000 species known to date, they are most popular and widely known among fishkeepers as scavenger for leftover food in the community aquarium. Catfish can also grow very big with size ranging from a few centimeters up to more than two meters in length. They feeding behavior is usually after the aquarium lights are out and their diet varies considerably between different species. Let’s look at some of the most common freshwater catfish families.
Mochokidae (upside-down catfish) – This family of African catfish spends most their time upside-down near the surface although there are some within the family that tends to be bottom-dwellers. They are known to have attractive markings on their body and usually they grow up to moderate size from 7-35 centimeters.
Doradidae (talking catfish)
This type of catfish is unique in the sense that they have the ability to produce sounds using the pectoral fins or by vibrating their swim bladder. They originated from South America and their body is fully armored. The size can range between 7 to more than 75 centimeters in length and usually the smaller sized species is suited for community aquarium.
It is quite impossible to list each and every one of them here and I would suggest a good reference such as http://en.wikipedia.org/wiki/Catfish. With further research, you will be amazed with the number of diverse species that comes up and I’m sure as an aquarist, at any point, you will find that Catfish will make interesting aquarium pets.
» Other freshwater tropical fish: Neon Fish, Red-Tailed Black Shark