Species: Nomeus gronovii, the Man-of-war fish
Nomeus gronovii (Gmelin, 1789)
Body elongate; eye large, with a fatty ring around it; mouth small, usually ends before eye; teeth small, conical, ~ 1 row on jaws; teeth on center and sides of roof of mouth, and on bases of gill arches, none on tongue; opercle thin, with 2 flat spines; gill rakers 8 + 15 -19; 2 scarcely separated dorsal fins, 1st with IX-XII spines, which fold into a groove, its origin behind (in small specimens directly over) pectoral origin, longest spine slightly longer than longest ray; anal fin I-II, 24-29; pelvic fins insert before or under pectoral base, fan shaped, attached to belly along entire length, folds into a groove; pectoral fins 19-24, long and wing-like, with oblique bases; branched mucous canal along flank; scales on head in a broad band, extending before eyes; lateral line complete, high along back. Juvenile with greatly enlarged pelvic fins and round pectoral fins, deeply forked tail fin; lateral line ends under end of dorsal fin base.
Juveniles: silvery blue with black bars and spots; pelvic fins blue-black with white blotches; adults: uniformly dark brown.
Size: reaches 40 cm.
Inhabits surface layers of the high seas; young are associated with drifting Man-of-War siphonophores (Physalia).
Depth: 0-20 m.
Worldwide in warm temperate and tropical seas. The tip of Baja California to the eastern Gulf of California to Peru and the oceanic islands.
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- Marine Only
- Offshore Only
- Water Column Position
- Mid Water
- Water column only
- Near Surface
- Water column
- FishBase Habitat
- Feeding Group
- No Data
- Pelagic jellyfish/ctenophores
- Egg Type
- Pelagic larva
- No data
- Global Endemism
- Transisthmian (East Pacific + Atlantic of Central America)
- "Transpacific" (East + Central &/or West Pacific)
- East Pacific + all Atlantic (East+West)
- All Pacific (West + Central + East)
- TEP non-endemic
- Circumtropical ( Indian + Pacific + Atlantic Oceans)
- All species
- East Pacific + Atlantic (East +/or West)
- Regional Endemism
- All species
- Tropical Eastern Pacific (TEP) non-endemic
- Eastern Pacific non-endemic
- Island (s)
- Continent + Island (s)
- Climate Zone
- Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
- Northern Subtropical (Cortez Province + Sinaloan Gap)
- Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
- South Temperate (Peruvian Province )
- IUCN Red List
- Not evaluated / Listed
- Not listed
- Length Max
- Depth Range Min
- Depth Range Max