Notacanthidae

Notacanthidae, the deep-sea spiny eels, are a family of fishes found worldwide below , and as deep as .

Their bodies are greatly elongated, though more tapered than in true eels. The caudal fin is small or nonexistent, while the anal fin is lengthy, as long as half of the total body length. They feed on animals attached to or living on the sea floor, such as sea anemones, echinoderms, molluscs, and worms.