Nomeus gronovii (Gmelin, 1789)
Man-of-war fish
Nomeus gronovii
photo by O'Donnell, P.

Family:  Nomeidae (Driftfishes)
Max. size:  39 cm TL (male/unsexed)
Environment:  demersal; marine; depth range 200 - 1000 m
Distribution:  Western Atlantic: Newfoundland, Canada and northern Gulf of Mexico to Brazil (Ref. 7251). Eastern Atlantic: north-west Africa and the Canary Islands (Ref. 4777); also São Tomé Island (Ref. 34088). Not recorded from the Mediterranean and most of the eastern Atlantic (Ref. 9834). Indian and Pacific: widely distributed.
Diagnosis:  Dorsal spines (total): 9-13; Dorsal soft rays (total): 24-28; Anal spines: 1-2; Anal soft rays: 24-29; Vertebrae: 41-41. Juveniles whitish or silvery with dark blue mottlings; pelvic fins black (Ref. 4412). Dark blue above, side silvery with patches of dark blue. Pelvic fin with inner rays joined to abdomen by membrane for its entire length (Ref. 26938).
Biology:  Found offshore in warm waters. Juveniles pelagic in coastal and offshore waters down to at least 30 m, but adults possibly demersal in deep water (Ref. 9563). Occur in association with floating Portuguese man-of-war, Physalia, feeding on its tentacles and gonads and may drift with it into shore waters with proper wind conditions (Ref. 4777). Probably also feed on other soft-bodied jellyfish as well as on zooplankton (Ref.4777).
IUCN Red List Status: Least Concern (LC); Date assessed: 29 January 2013 Ref. (124695)
Threat to humans:  harmless
Country info:   

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