Elasmobranchii (sharks and rays) > Squaliformes
(Bramble, sleeper and dogfish sharks) > Squalidae
Etymology: Squalus: Latin, squalidus = pale, weak (Ref. 45335).
Environment / Climate / Range
Marine; demersal; depth range 60 - 400 m (Ref. 247). Subtropical; 36°N - 56°S, 97°W - 45°W (Ref. 54893)
Size / Weight / Age
Maturity: Lm ?  range ? - 50 cm
Max length : 110 cm TL male/unsexed; (Ref. 247); common length : 75.0 cm TL male/unsexed; (Ref. 247)
A slim, gray shark with tips of dorsal fins black and edges of pectoral, pelvic and caudal fins white; two dorsal fins each with strong, ungrooved spine at front edge (Ref. 26938).
Western Atlantic: North Carolina to Florida (USA), Gulf of Mexico, Cuba, Hispaniola; southern Brazil and Argentina.
Inhabits continental shelves and uppermost slopes. Found in 60 to 380 m deep (Ref. 26938). Found on or near the bottom in large, dense schools. Probably feeds on bottom fishes and invertebrates. Ovoviviparous, with about 10 young per litter. A huge parasite (isopod) lives in its buccal cavity. Seldom used for food, but taken in commercial catches for its liver which yields oil and vitamins. Maximum depth reported taken from Ref. 55584.
Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 1 - Hexanchiformes to Lamniformes. FAO Fish. Synop. 125(4/1):1-249. Rome: FAO.
IUCN Red List Status (Ref. 90363)
Threat to humans
Fisheries: minor commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
CollaboratorsPicturesStamps, CoinsSoundsCiguateraSpeedSwim. typeGill areaOtolithsBrainsVision
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00380 (0.00169 - 0.00856), b=3.06 (2.88 - 3.24), based on LWR estimates for this Genus-BS (Ref. 93245
Trophic Level (Ref. 69278
): 4.2 ±0.7 se; Based on diet studies.
Resilience (Ref. 69278
): Very Low, minimum population doubling time more than 14 years (Fec=10).
Vulnerability (Ref. 59153
): High to very high vulnerability (66 of 100) .