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Swim bladder disease is a very common illness within aquarium fish that results in the bladder not functioning properly causing the fish to swim upside down. This disorder can be due to multiple factors such as physical abnormalities, environmental, mechanical, or in some cases due to fishes being inbred.
In the wild, it swims upside down with its belly facing upward, which explains its darker colors on the underside and lighter colors on the dorsal side. [1] In captivity, however, the fish sometimes stops swimming upside down and its color pattern reverses, so that it is dark on the back and light on the underside. [ 1 ]
Poecilia sphenops, called the Mexican molly or simply the molly, is a species of poeciliid fish from Central America. It was once understood as a widespread species with numerous local variants ranging from Mexico to Venezuela, but these variants are today considered distinct species belonging to the P. sphenops complex and P. sphenops itself as being native to Mexico, Guatemala, and Honduras.
Like other Synodontis species, this fish almost always swims upside down. [2] This fish may grow up to 50 centimetres (20 in) TL and weigh up to 1.5 kilograms (3.3 lb). [4] This omnivorous fish feeds on plankton, algae, detritus, surface insects, chironomid larvae, benthic crustaceans, and molluscs. It is oviparous and venomous. [4] [3]
The most commonly kept species are guppies (P. reticulata), mollies (P. sphenops or P. latipinna), and Endler's livebearers . Members of the genus readily hybridize with each other and so most commercially offered fish are hybrids (with guppies having some Endler, and mollies being a mix of common and sailfin mollies).
Poecilia vandepolli, or Van de Poll's molly, is a poeciliid fish native to the ABC islands of the Lesser Antilles, namely Aruba, Bonaire, and Curaçao. It is a euryhaline species and one of the most common fish in its range , inhabiting fresh, brackish , salt, and hypersaline waters.
The more objects around the fish, the more they tend to swim upside down. [4] When close to an object, the fish puts its ventral side closest to the object. [4] It rarely swims in the middle of the water, preferring to swim either at the bottom or at the surface. [6] By swimming upside down when it feeds, [7] it can readily catch prey at the ...
Poecilia kykesis, also known as the Usumacinta molly, Petén molly, spiketail molly, or swordtail molly, is a poeciliid fish species native to the fresh and brackish waters of Mexico, Guatemala, and Belize. It belongs to the sailfin molly clade, with males exhibiting an enlarged dorsal fin.