There are thousands of different types of freshwater fish that one can keep inside of their aquarium, many of them are siblings of each other species wise. Thus, each type of fish is categorized into their parent species to make searching easier, and to provide you with information about the different varieties quickly. Like any other animal categorization, there will be various fish that do not belong in any given species category as they are either too few, too different, or have not been classified by aquatic biologists into a respective section.
Consists of species of fish that have a lung and require access to the surface to breathe air. Generally they are small to medium in size, hardy, and peaceful fish that are well suited to community aquariums with the exception of some of aggressive males.
Consists of species of fish that are band like in shape. Many are found within the depths of anywhere from 262 - 1,640 ft (80 - 500 meters) below the surface of the water, although some are known to live in shallow waters.
Consists of species that are covered with skin or an armor-like plating. Many catfish are used as scavengers in aquariums and while many species are well adapted to this, some have very different eating habits.
Consists of a very large number of fish that are commonly found in Africa and the Americas. Some of the smaller species are very popular in community aquariums, with the note that many of these species are wild caught.
Consists of a very large and diverse number of fish that are found throughout Africa, Americas, and Asia. The bright colors and diversity of habitat common to these species make them popular in many aquariums.
Consists of a large number of fish that are found throughout the world and includes both tropical varieties and coldwater species. Many of these species are popular in the aquarium because of their hardiness, ease of care and willingness to breed.
Consists of species of fish that are normally found in fast moving water, or have no bones are able to hide in almost any area.
Consists of fish that are usually small and live and feed near the surface. Many of these species are popular in the aquarium because of their ease and willingness to breed.
Consists of species of fish that give birth to live fry as compared to other species not in this group which are egg layers.
Consists of species of fish that will double to triple their size with water or air if they feel threatened. Relatively hardy and adapt well to captivity if provided with swimming room and a few hiding places.
Consists of a set of species from a variety of different habitats and the individual needs of each species should be researched. Most species are small, peaceful, and colorful, and make good additions to a community aquarium.