Allfishes
Astyanax jordani
Anoptichthys jordani
Astyanax jordani is very close to A. mexicanus and their taxonomic affiliation is controversial. Some consider …
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 1–20 of 20
Black tetra
Gymnocorymbus ternetzi
The black tetra has a flat, tall body.
Bowfin
Amia calva
The ancient fish, described by some as looking more like a snake than a fish, has …
Cardinal tetra
Paracheirodon axelrodi
The Cardinal tetra has an elongated body that is slightly flattened on the sides. The females …
Golden pencilfish
Nannostomus beckfordi
The genus name Nannostomus comes from the Latin nannus ("small") and the Greek stoma ("mouth"), referring …
One-lined pencilfish
Nannostomus unifasciatus
The name unifasciatus comes from the Latin words uni ("one") and fasciatus ("banded"), meaning "one-banded." The …
Paddlefish
Polyodon spathula
The paddlefish is almost sharklike in appearance, and if you cut off its long paddle-like snout, …
Pallid sturgeon
Scaphirhynchus albus
The pallid sturgeon has a distinctive, prehistoric appearance. Its body is elongated, nearly cylindrical, with a …
Piraya
Pygocentrus piraya
The piraya has a laterally compressed, roughly circular profile typical of piranhas. A distinctive feature 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 …
Siberian sturgeon
Huso baerii
The Siberian sturgeon has a spindle-shaped body with several longitudinal rows of bumps. Its short, triangular …
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 …
Sturgeon, Atlantic
Acipenser oxyrinchus
The Atlantic sturgeon is dark brown or olive green with a white belly. The head is …
Sturgeon, Lake
Acipenser fulvescens
Lake sturgeon are somewhat torpedo-shaped, and the upper lobe of the caudal fin is longer than …
Sturgeon, Shovelnose
Scaphirhynchus platorinchus
The shovelnose sturgeon has a broad, flat head with an elongated shovel-like snout. There are four …
Sturgeon, White
Acipenser transmontanus
The adult white sturgeon has a moderately blunt snout, spines closer to the tip of the …
Sturgeon: Green Sturgeon
Acipenser medirostris
Sturgeon and paddlefish, best known for their black caviar, belong to the order Acipenseriformes, but at …
Three-lined pencilfish
Nannostomus trifasciatus
The genus name Nannostomus comes from the Greek nannos ("dwarf") and the Latin stomus ("mouth"), referring …