| Common names: houndshark (English), tollo (Espanol) |
Triakis acutipinna Kato, 1968
Elongate, relatively robust body; snout short, bluntly rounded; mouth convex; eyes horizontal ovals, with ventral nictitating membranes; widely separated anterior nasal flaps do not meet mouth; teeth semi-molar-like, with straight erect points and side points absent or poorly developed; 5 gill slits, last 2 over pectoral fin base; pectorals narrowly curved with pointed tips in adults; 2 large dorsal fins, second slightly smaller than first; first dorsal fin with vertical rear edge, centered midway between pectoral and pelvic bases; anal fin smaller than and with origin under middle of second dorsal; tail strongly asymmetrical, lower lobe with small point; fins with angular points.
Grey; no spots.
Size: 112 cm.
Habitat: continental platform.
Depth: 50-200 m.
Southern Colombia to Perú.
Global Endemism: All species, East Pacific endemic, Tropical Eastern Pacific (TEP) endemic
Regional Endemism: All species, TEP endemic, Continental TEP endemic, Panamic province endemic, Continent, Continent only
Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo), South Temperate (Peruvian Province )
Catalog Number: USNM 201409
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Year Collected: 1961
Locality: Isla De La Plata, acquired from fishermen., Ecuador, Pacific
- Holotype: Kato, S. 1968. Copeia. 2: 320, Figs. 1, 2.
Inshore/Offshore: Inshore, Inshore Only
Water Column Position: Bottom, Bottom only
Habitat: Reef (rock &/or coral), Rocks, Reef and soft bottom, Soft bottom (mud, sand,gravel, beach, estuary & mangrove), Mud, Sand & gravel
FishBase Habitat: Demersal
Habitat and Ecology
Diet: mobile benthic crustacea (shrimps/crabs), bony fishes
Life History and Behavior
CITES: Not listed
IUCN Red List Assessment
Red List Category
Red List Criteria
The sharpfin houndshark is rarely landed in coastal monofilament gillnet artisanal fisheries in the fishing port of Daniel López in Manabí, Ecuador (J. Martínez pers. comm.). It is unknown if the species is taken in other inshore artisanal fisheries.
Field surveys are required to accurately document the species' distribution and habitat requirements. An assessment of what fisheries are catching the species and where it is being landed is also required. The sharpfin houndshark, along with other inshore elasmobranch species, would then benefit from effective regulation of these fisheries. However, given the rarity of this species, along with its occurrence in exploited inshore waters, it likely requires more immediate conservation actions, i.e. full protection.
Relevance to Humans and Ecosystems
The sharpfin houndshark, Triakis acutipinna, is a houndshark of the family Triakidae. Only two specimens have been found, both in the coastal waters of Ecuador, the longest one being 1.02 meters in length. The reproduction of this houndshark is ovoviviparous.
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