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Guppies prefer water temperatures around 22.2–26.1 °C (72–79 °F) for reproduction. Pregnant female guppies have enlarged and darkened gravid spots near their anal vents. Just before birth, the eyes of fry may be seen through the translucent skin in this area of the female's body. [64]
A few species, most notably Dermogenys pusillius, have traditionally been kept in slightly brackish water, though some authors aver that those found in brackish water are estuarine juveniles. [6] [17] Most traded species of Nomorhamphus and Hemirhamphodon prefer soft, neutral to slightly acidic, fresh water conditions. [12] [21]
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). [9]
P. picta is distributed throughout northeastern South America, including Guyana, Suriname, and Venezuela, and the Caribbean islands, a range it shares with the closely related guppies P. reticulata and P. parae. [2] [5] P. picta occurs in lowland habitats such as slowly-flowing waters at stream mouths and still water lagoons. These are often ...
Guppies are a common example of feeder fish. Feeder fish is the common name for certain types of small, inexpensive fish commonly fed as live food to other captive animals such as predatory fishes (e.g. aquarium sharks, farmed salmon and tuna) or carnivorous aquarium fish (e.g. oscars, gar, grouper and rays), turtles, crocodilians and other piscivores that naturally hunt in fresh, brackish or ...
For example, guppies might exhibit a visual signal of approaching and inspecting possible predator which communicates to the predator that the guppies are aware and will be harder to catch. It has been shown that cichlid (the guppies’ predator) are less likely to attack the guppies which exhibit inspecting behaviours.
Requires brackish aquarium conditions with very low Nitrite and Nitrate levels to be kept successfully. Freshwater compromises immune system, harms puffer, and shortens life extremely. Commonly kept in freshwater. Green spotted puffer Tetraodon nigroviridis: 6" Often sold as freshwater fish, but this species actually thrives in brackish water.
Poeciliidae are a family of freshwater ray-finned fishes of the order Cyprinodontiformes, the tooth-carps, and include well-known live-bearing aquarium fish, such as the guppy, molly, platy, and swordtail.