CR

Smalleye Hammerhead

Sphyrna tudes

Declining

Overview

The smalleye hammerhead, also called the golden hammerhead or curry shark, is a small species of hammerhead shark in the family Sphyrnidae. This species was historically common in the shallow coastal waters of the western Atlantic Ocean, from Venezuela to Uruguay. It favors muddy habitats with poor visibility, reflected by its relatively small eyes.

Adult males and juveniles are schooling and generally found apart from the solitary adult females. Typically reaching 1.2–1.3 m (3.9–4.3 ft) in length, this shark has a unique, bright golden color on its head, sides, and fins, which was only scientifically documented in the 1980s. As in all hammerheads, its head is flattened and laterally expanded into a hammer-shaped structure called the cephalofoil, which in this species is wide and long with an arched front margin bearing central and lateral indentations.

The smalleye hammerhead shark faces severe population declines primarily due to intensive fishing pressure throughout its range in the western Atlantic. This species is particularly vulnerable to both targeted fishing and bycatch in gillnet and longline fisheries, with its shallow coastal habitat overlapping extensively with high-intensity fishing zones. The species' slow reproductive rate and late maturity make population recovery extremely difficult once depleted.

Threat summary

Habitat

The smalleye hammerhead inhabits shallow coastal waters, continental shelves, and nearshore environments in the western Atlantic Ocean. This species typically occurs in waters less than 40 meters deep, preferring sandy and muddy bottoms where it feeds on small fish, crustaceans, and cephalopods.

MARINE· major

Conservation measures underway

Species recoveryLegislationCompliance and enforcement

Frequently asked questions

Why is Smalleye Hammerhead classified as Critically Endangered?
Smalleye Hammerhead 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 smalleye hammerhead shark faces severe population declines primarily due to intensive fishing pressure throughout its range in the western Atlantic. This species is particularly vulnerable to both targeted fishing and bycatch in gillnet and longline fisheries, with its shallow coastal habitat overlapping extensively with high-intensity fishing zones. The species' slow reproductive rate and late maturity make population recovery extremely difficult once depleted.
Where does Smalleye Hammerhead live?
Smalleye Hammerhead occurs in Algeria, Argentina, Brazil, Cambodia, China, and Colombia (plus 20 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 Smalleye Hammerhead?
The main threats to Smalleye Hammerhead are 5.4, 8.1, ai-1, and ai-2. The full IUCN-classified threat record for this species is detailed on the species page.

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