Cheap Aquarium Fish - Freshwater Fish Belontidae
FRESHWATER FISH BELONTIIDAE These fish possess an unusual feature: located in the upper part of the head is a special organ known as the labyrinth - hence their earlier name of Labyrinthidae. They were also formerly known as Anabantidae (meaning “climbers”), since some can scramble out onto land. The labyrinth, in fact, allows them to breathe oxygen from the atmosphere. This process is supplemental to the normal function of the gills and represents an adaptation to their habitat, developing in juveniles during the first few weeks of life. The underlying reason is that Belontiidae, natives of Asia, live in environments deficient in oxygen: standing water, stagnant and often muddy, including pools and rice paddies. The pectoral fins of certain species have developed thread-like organs which have a tactile function and help the fish find its direction. Betta splendens The Siamese fighting fish only partly deserves its common name: the males are aggressive towards one another - and to females after spawning - but they do not interfere with other species. The females are always mutually tolerant. A handsome male (red, blue, or green) can therefore be kept in a regional or community tank. As soon as the female has laid her clutch of several hundred eggs, she must be removed, as she runs the risk that her mate will attack or even kill her. Incubation takes 2 days; remove the male after hatching. The fry will develop rapidly. Size: 6-8 cm. Betta splendens A ripe female. Colisa fasciata Males of the giant gourami will battle for dominance. The females lay over 100 eggs in soft, acidic water. This species interbreeds with the thicklipped gourami: dealers market the resulting hybrids under either name. Size: 10 cm. Betta splendens Males. Colisa sota (Colisa chuna) The honey gourami does not always construct a nest for spawning: the male carries the fry about until they are free-swimming. A gregarious but timid species. Size: 5 cm. Colisa labiosa The timid thick-lipped gourami hides in the vegetation whenever it feels threatened. The female lays several hundred eggs in soft, acidic water. Size: 10-12 cm.
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Tags: freshwater fish, giant gourami