Eeltail catfish can be found in both marine and freshwater.

Tandanus is a genus of eeltail catfishes endemic to Australia.

Like other eeltail catfish, the cobbler resembles a catfish in front, but an eel behind.

The eeltail catfish are a family (Plotosidae) of catfish whose tails are elongated in an eel-like fashion.

Plotosus lineatus, common name Striped eel catfish, is a species of eeltail catfishes belonging to the family Plotosidae.

Plotosus is a genus of eeltail catfishes native to the Indian Ocean, the western Pacific Ocean and New Guinea.

The most speciose families in New Guinea are the rainbowfish, blue-eyes, gudgeons and gobies, but there are also several species of Old World silverside, grunters, glassfish, ariid catfish, eeltail catfish and more.

The Kutubu tandan (Oloplotosus torobo) is a species of fish in the Plotosidae family.

Plotosus lineatus, common name Striped eel catfish, is a species of eeltail catfishes belonging to the family Plotosidae.

The freshwater cobbler, Tandanus bostocki, is a species of catfish (order Siluriformes) of the family Plotosidae.

Phreatobius has been classified with a number of different families: Clariidae, Plotosidae, Trichomycteridae, Cetopsidae, and Pimelodidae.

Ostariophysians account for about 68% of all freshwater species; in fact, there are only about 123 marine species (Chanidae, Gonorynchidae, most Ariidae, about half of Plotosidae).