Freshwater

African brown knifefish

Xenomystus nigri

The body of this fish is unusual: it is flattened ventrolaterally and elongated, giving it a …

Arapaima

Arapaima gigas

The body of the arapaima is elongated and compressed from the sides. It is covered with …

Astyanax jordani

Anoptichthys jordani

Astyanax jordani is very close to A. mexicanus and their taxonomic affiliation is controversial. Some consider …

Black tetra

Gymnocorymbus ternetzi

The black tetra has a flat, tall body.

Campylomormyrus curvirostris

Campylomormyrus curvirostris, gnathonemus curvirostris, campylomormyrus rhynchophorus.

The snout of Campylomormyrus curvirostris is highly elongated and curved downward like a trunk, with a …

Campylomormyrus numenius

Campylomormyrus numenius

Campylomormyrus numenius possesses a highly elongated, ventrally curved rostrum, analogous to an elephant's trunk, terminating in …

Cardinal tetra

Paracheirodon axelrodi

The Cardinal tetra has an elongated body that is slightly flattened on the sides. The females …

Eastern bottle-nosed mormyrid

Mormyrus longirostris

The eastern bottle-nosed mormyrid has such a distinctive appearance that it cannot be confused with any …

Frankfish

Gymnarchus niloticus

The Frankfish has a long and slender body. It possesses four small bony gills on both …

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 …

Peters's elephant-nose fish

Gnathonemus petersii

The elephantnose fish has a moderately deep, laterally compressed body with a distinctive sharp, funnel-shaped snout. …

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 …

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 …