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The vernacular name for Alfaro cultratus, knife livebearer, comes from the two knife-shaped rows of scales near the tail on the lower end of the fish. [2] It is known as olomina in Costa Rica , [ 3 ] as are many similar fish.
Featherbacks have slender, elongated, bodies, giving them a knife-like appearance. The caudal fin is small and fused with the anal fin, which runs most of the length of the body. Where present, the dorsal fin is small and narrow, giving rise to the common name of "featherback". The fish swims by holding its body rigid and rippling the anal fin ...
There have been 80 fish species registered as of 2008. [8] The bobo mullet (Joturus pichardi), Brachyrhaphis olomina, [12] knife livebearer fish (Alfaro cultratus) and the tetra (Astyanax fasciatus) are quite common. [8] The endangered tropical gar (Atractosteus tropicus), known locally as pez gaspar, occurs here. [3]
Gymnotus is a genus of Neotropical freshwater fish in the family Gymnotidae found widely in South America, Central America and southern Mexico (36th parallel south to 18th parallel north). [1] The greatest species richness is found in the Amazon basin . [ 2 ]
Aside from the electric eel (Electrophorus electricus), Gymnotiformes are slender fish with narrow bodies and tapering tails, hence the common name of "knifefishes".They have neither pelvic fins nor dorsal fins, but do possess greatly elongated anal fins that stretch along almost the entire underside of their bodies.
Knifefish may refer to several knife-shaped fishes: The Neotropical or weakly electric knifefishes, order Gymnotiformes, containing five families: Family Gymnotidae (banded knifefishes and the electric eel) Family Rhamphichthyidae (sand knifefishes) Family Hypopomidae (bluntnose knifefishes) Family Sternopygidae (glass and rat-tail knifefishes)
Like the other gymnotiforms, gymnotids have classic knifefish bodies. The body is long and eel-like, the dorsal fin and pelvic fins are absent, and the anal fin is extremely long and used for movement.
Livebearers are fish that retain their eggs inside the body and give birth to live, free-swimming young. They are especially prized by aquarium owners. They are especially prized by aquarium owners. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies , mollies , platies and swordtails .
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