Élasmobranches (requins et raies) (sharks and rays) >
Squaliformes (Sleeper and dogfish sharks) >
Dalatiidae (Sleeper sharks)
Etymology: Squaliolus: Diminutive of squalus (L.), a sea-fish, usually applied to sharks, referring to small size of S. laticaudus. (See ETYFish); aliae: In honor of the Teng’s wife Huang A-li, for her “cordial help and constant encouragement” [originally spelled alii; since name honors a woman, aliae reflects the correct gender]. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
Écologie
marin bathypélagique; profondeur 200 - 2000 m (Ref. 6871). Deep-water
Western Pacific: Japan to Australia (off northwestern Australia and New South Wales).
Length at first maturity / Taille / Poids / Âge
Maturity: Lm ?, range 15 - ? cm
Max length : 22.0 cm TL mâle / non sexé; (Ref. 6871)
Épines dorsales (Total): 1; Rayons mous dorsaux (Total): 0; Épines anales 0; Rayons mous anaux: 0. The smalleye pygmy shark, Squaliolus aliae, is a very small dogfish (about 22cm) characterized by its small eye, with diameter about 46-70% of interorbital width, and with upper margin angular and chevron-shaped; upper lip with a pair of prominent lateral papillae (rarely indistinct) (Ref. 31367, 6871).Colour: dark brown to black, fin margins pale (Ref. 6871). Squaliolus are the only sharks with a fin spine on its first dorsal fin (spine sometimes concealed by skin) but not on its second dorsal fin; second dorsal fin long-based and low, about twice the length of the first dorsal fin base; first dorsal-fin base closer to pectoral fins than to pelvic fins; and caudal fin nearly symmetrical, with subterminal notch present (Ref. 247, 6871).
Possibly the smallest living shark (Ref. 6871). Found near continental and island land masses (Ref. 31367). Feeds mainly on cephalopods and small midwater bony fishes (Ref. 6871). Probably makes diurnal vertical migrations from within 200 m of the surface at night down to about 2,000 m during the day (Ref. 6871). Ovoviviparous (Ref. 6871).
Life cycle and mating behavior
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Distinct pairing with embrace (Ref. 205). Ovoviviparous but litter size unknown (Ref. 6871). Males mature at 15 cm (Ref. 31367).
Last, P.R. and J.D. Stevens, 1994. Sharks and rays of Australia. CSIRO, Australia. 513 p. (Ref. 6871)
Statut dans la liste rouge de l'IUCN (Ref. 130435)
Menace pour l'homme
Harmless
Utilisations par l'homme
Pêcheries: sans intérêt
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Estimates based on models
Preferred temperature (Ref.
123201): 4.6 - 10.1, mean 6.5 °C (based on 559 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.7520 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00372 (0.00141 - 0.00976), b=3.12 (2.89 - 3.35), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 4.4 ±0.57 se; based on food items.
Résilience (Ref.
120179): Faible, temps minimum de doublement de population : 4,5 à 14 années (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Low vulnerability (12 of 100).
