Arctozenus risso

FamilyScientific NameAuthorYearCommon Name
ParalepididaeArctozenus risso(Bonaparte 1840)1840White Barracudina

Family Paralepididae — Small to medium-sized (6 to 56 cm), very elongate and slender aulopiform fishes; cross-section of body oval or compressed. Eye medium to large, nontubular, located on side of head. Snout very long and pointed with terminal mouth, but lower jaw projects as fleshy process; mouth extends to front of eye or under middle of eye. Teeth small; alternately fixed and depressible fang-like teeth on lower jaw and roof of mouth. Single small supramaxilla on dorsal edge of maxilla. Gill rakers reduced to small multiple spines set on bony plates.

Arctozenus risso

Unique Characters: Body elongate, its depth 10 or more times in SL. Snout pointed, about half head length. Gill rakers needle-like in multiple series on bony bases. Dorsal fin short, well behind midpoint of body, with 9-10 fin rays. A small adipose dorsal fin near tail. Pectoral fin rays 11-13; pelvic fins behind dorsal fin base, with 9 fin rays; anal fin far back on body, with 30-32 fin rays. Anus between pelvic fins. Body scaled, but scales delicate and easily shed; 62-67 scales in lateral line. Large melanophores scattered to make dark dorsal band. Size: to 29 cm.

Reference: Marine Species Identification Portal. Accessed at:

Unique Characters: Body covered by cycloid scales, moderately stout to slender. Body uniformly and densely covered with chromatophores. Body depth 9‒16 times in standard length. A short, deep head, depth at middle of eye 3.5‒4.1 in head length. Gill rakers with multiple rows of short teeth, which never slender or needle-like. Scales on body smaller than lateral-line scales. Anterior lateral-line scales subequal in depth and length. Teeth on anterior portion of palatine enlarged and fang-shape; two rows of tooth pairs on lower jaw. Pelvic fin origin under dorsal-fin base.

Reference: Ho, H. and G. Duhamel. 2019. A new species of the fish genus Arctozenus from the Kerguelen Islands, with comments on the lost teeth in adults (Aulopiformes: Paralepididae). Zootaxa 4651 (3):497–512.

Similar Species: None.