Actinopterygii (ray-finned fishes) > Tetraodontiformes
(Puffers and filefishes) > Monacanthidae
Etymology: Monacanthus: Greek, monos = one + Greek, akantha = thorn (Ref. 45335).
Environment / Climate / Range
Marine; reef-associated; depth range ? - 50 m (Ref. 3790). Subtropical; 52°N - 51°S
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 20.0 cm TL male/unsexed; (Ref. 7251); common length : 10.0 cm TL male/unsexed; (Ref. 3790)
soft rays: 28 - 36. Snout prominently projecting but not very elongate; first dorsal spine originating above posterior part of eye; adult males with two pairs of enlarged recurved spines on each side of caudal peduncle; spines of females only slightly larger than other scale spinules of caudal peduncle (Ref. 13442).
Western Atlantic: Newfoundland (Canada), Bermuda, and northern Gulf of Mexico to Argentina, including the Caribbean (Ref. 3790). Eastern Atlantic.
Occurs in shallow water down to 50 m depth, over sandy and rocky bottoms, but more commonly in grass beds (Ref. 3790). Often seen moving head down among seagrass blades (Ref. 9710). The young are often associated with floating Sargassum (Ref. 3720). Feeds on plants and algae, and also on small crustaceans (Ref. 3720). Rarely consumed (Ref. 3790).
Robins, C.R. and G.C. Ray, 1986. A field guide to Atlantic coast fishes of North America. Houghton Mifflin Company, Boston, U.S.A. 354 p.
IUCN Red List Status (Ref. 90363)
Threat to humans
Reports of ciguatera poisoning (Ref. 30303)
Fisheries: subsistence fisheries; aquarium: commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01393 (-0.10252 - 0.13037), b=2.85 (2.77 - 2.93), based on LWR estimates for species & family-BS (Ref. 93245
Trophic Level (Ref. 69278
): 2.7 ±0.3 se; Based on diet studies.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (30 of 100) .