CR

Squatina oculata

DecliningCREUCREU

Overview

Squatina oculata, commonly known as the smoothback angelshark, is a critically endangered species of angelshark found in the northeastern Atlantic Ocean and Mediterranean Sea. This bottom-dwelling elasmobranch is characterized by its flattened body shape and ability to bury itself in sandy or muddy substrates, making it well-adapted for ambush predation. Historically distributed along European coasts from the North Sea to Morocco, including the Mediterranean, the species has experienced severe population declines and range contractions over the past century.

The smoothback angelshark inhabits continental shelf waters, typically at depths ranging from shallow coastal areas to approximately 150 meters. Like other angelsharks, it feeds primarily on bottom-dwelling fish, crustaceans, and mollusks. The species faces multiple anthropogenic threats that have contributed to its critical conservation status.

Commercial fishing activities, particularly bottom trawling, have significantly impacted populations through both targeted capture and incidental bycatch. Habitat degradation from coastal development and marine pollution further compounds these pressures. The species' slow reproductive rate, with late sexual maturity and low fecundity, makes population recovery particularly challenging.

Conservation efforts include fishing restrictions in some areas, habitat protection measures, and research programs aimed at better understanding remaining populations. Several European countries have implemented species-specific protection measures, and the species is listed under various international conservation frameworks. However, coordinated international action remains essential for the species' long-term survival.

The smoothback angelshark faces severe threats from commercial fishing activities, particularly bottom trawling operations that destroy benthic habitats and result in high bycatch mortality. Coastal development and habitat degradation have further reduced suitable breeding and feeding areas. The species' naturally slow reproductive rate makes recovery from these anthropogenic pressures extremely difficult.

Threat summary

Habitat

Squatina oculata inhabits sandy and muddy bottoms of continental shelf waters in the northeastern Atlantic and Mediterranean Sea, typically at depths from shallow coastal areas to around 150 meters. The species prefers areas with soft substrates where it can effectively bury itself for camouflage and ambush hunting.

MARINE· major

Conservation measures underway

Species managementPolicies and regulationsCompliance and enforcement

Frequently asked questions

Why is Squatina oculata classified as Critically Endangered?
Squatina oculata is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. The smoothback angelshark faces severe threats from commercial fishing activities, particularly bottom trawling operations that destroy benthic habitats and result in high bycatch mortality. Coastal development and habitat degradation have further reduced suitable breeding and feeding areas. The species' naturally slow reproductive rate makes recovery from these anthropogenic pressures extremely difficult.
Where does Squatina oculata live?
Squatina oculata occurs in Angola, Benin, Cameroon, Congo - Brazzaville, Congo - Kinshasa, and Côte d’Ivoire (plus 21 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Squatina oculata?
The main threats to Squatina oculata are 5.3, 5.4, and 6.1. The full IUCN-classified threat record for this species is detailed on the species page.

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