Allfishes
Argentine pearlfish
Austrolebias bellottii
The Argentine pearlfish has a laterally compressed, fusiform (spindle-shaped) body with a rounded profile. Males are …
Freshwater
Freshwater fish spend part or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 1.05%.
Showing 1–21 of 21
Astyanax jordani
Anoptichthys jordani
Astyanax jordani is very close to A. mexicanus and their taxonomic affiliation is controversial. Some consider …
Black Molly
Poecilia sphenops
The Black Molly has an elongated body. Females tend to be more rounded in appearance. The …
Black tetra
Gymnocorymbus ternetzi
The black tetra has a flat, tall body.
Cardinal tetra
Paracheirodon axelrodi
The Cardinal tetra has an elongated body that is slightly flattened on the sides. The females …
Constancia’s seasonal killifish
Cynolebias constanciae
The body of Constancia's seasonal killifish (Cynolebias constanciae) is elongate and slightly laterally compressed.
Eastern mosquitofish
Gambusia holbrooki
The body of the Eastern mosquitofish is moderately elongated, not tall, and laterally compressed. It is …
Finescaled four-eyed fish
Anableps microlepis
Anableps: Greek, ana = up + Greek, blepo, blepsis, -eos = glance, sight.The elongated cylindrical body …
Golden pencilfish
Nannostomus beckfordi
The genus name Nannostomus comes from the Latin nannus ("small") and the Greek stoma ("mouth"), referring …
Green swordtail
Xiphophorus hellerii
Green swordtails have elongated, narrow bodies that are flattened on the sides. They also have large …
Guppy
Poecilia reticulata
Guppies exhibit pronounced sexual dimorphism, with males and females differing in size, shape, and colouration. Males …
Least killifish
Heterandria formosa
Least killifish differ little in body shape from their closest relatives, the Poecilia. They have an …
Mosquitofish
Gambusia affinis affinis
The male anal fin is modified and is an intermittent organ for introducing sperm into the …
One-lined pencilfish
Nannostomus unifasciatus
The name unifasciatus comes from the Latin words uni ("one") and fasciatus ("banded"), meaning "one-banded." The …
Piraya
Pygocentrus piraya
The piraya has a laterally compressed, roughly circular profile typical of piranhas. A distinctive feature is …
Porous seasonal killifish
Cynolebias porosus
The Porous seasonal killifish has a fusiform (spindle-shaped) body that is laterally compressed. The snout is …
Pyrrhulina filamentosa
Pyrrhulina filamentosa
Pyrrhulina filamentosa has an elongated body with a large caudal fin, the upper lobe of which …
Red-bellied piranha
Pygocentrus nattereri
The red-bellied piranha has a short, deep body shape. Its cross-section is compressed.All piranhas have large …
Slender piranha
Serrasalmus elongatus
The most important feature of the slender piranha, which is reflected in its name, is its …
Striped headstander
Anostomus anostomus
The body of the striped headstander is elongated, slightly compressed laterally, resembling a torpedo. The head …
Three-lined pencilfish
Nannostomus trifasciatus
The genus name Nannostomus comes from the Greek nannos ("dwarf") and the Latin stomus ("mouth"), referring …