Not all of them are recommended for beginners. Some of them are strictly recommended only for experienced fish keepers, so as to maintain the required factors needed for their survival.
Occasional lettuce and spinach are also enjoyed by Chinese algae eaters. It is said that, if these types of freshwater fish are not provided with other food sources (not just algae), they tend to prey on other fish neighboring them.
They are known as anadromous fish, which means that they live in the sea but reproduce in freshwater (stream or lake). An amazing fact about the life cycle of salmons is that they live in freshwater in their early life, get matured in saltwater, and return to breed in freshwater, before they die.
Black Ruby Barb
These freshwater tropical fish are usually found in streams on hills (300m from sea level). The black ruby fish is known to bear an aggressive temperament and prefers plants and rocks in their habitat.
After they return from their sea life, they tend to be larger in size than their 'like-ones', who did not go for a 'vacation at the sea!'
Some exotic types of goldfish species include oranda, ranchu, and pearlscape. Goldfish types that can be commonly found are fantail, black moor, common goldfish, and veiltail.
Swordtails fries must be kept away from other swordtails, as it is a common habit for these fish to eat the young ones. Prepared foods or live foods; both are their delicacies.
They keep their entire life span limited to one stretch of river and can be regarded as 'residential freshwater fish'. They prefer shallow water and living under stones, as they do not possess good swimming qualities. They feed mainly on invertebrates. Male bullheads become black and females become plump when they start the spawning period of their lives.
They form an important part of trout diet and mostly dwell in the upper reaches of rivers. In case of these species, the back becomes black, the sides turn golden, and the belly and lower fins appear bright red during their spawning season.
They thrive in ponds and have a large family of fish like the common or king carp, mirror carp, koi carp, carp bream, bighead carp, carnatic carp, and crucian carp. Carp fish are associated with bringing good fortune to people in the Asian countries.
About 41% of the total known species of fish are freshwater fish, and they spend their lives mostly in rivers, lakes, ponds, streams, etc., with a salinity as low as 0.05%. Different species of these fish have different needs and requirements with respect to their habitat. This fact becomes important when it comes to keeping them as pets.