is a member of the rattail family. Rattails, also known as grenadiers, resemble a large tadpole by having a characteristically large and broad head and a body that rapidly tapers into a moderately long thin whip-like tail. It has one small dorsal fin and a long continuous ventral fin. The roundnose grenadier reaches up to 1.1 m. It has a broad rounded snout with a large blunt knob-like scute at its tip. It has very large eyes but a small mouth. A small barbel is present on the chin. The body is brownish-grey in colour.