Tope

The tope is a slender, migratory houndshark reaching around 2 meters in length, distinguished by a pointed snout, large eyes, and a asymmetrical crescent-shaped tail. It is a fast-swimming predator feeding primarily on small schooling fish, cephalopods, and crustaceans, occupying a mid-to-upper trophic position in coastal and shelf ecosystems. Females give birth to live young after a gestation period of about a year, producing relatively small litters, which limits population recovery when numbers decline.

This species has a wide, largely temperate distribution across both hemispheres, occurring in coastal and oceanic waters off the Americas, Europe, Africa, Oceania, and parts of Asia, including nations such as Argentina, South Africa, New Zealand, the United Kingdom, and Chile. It uses nearshore neritic zones as nursery and feeding grounds and moves into oceanic waters during migrations.

Population declines are driven primarily by targeted and incidental capture in commercial fisheries, particularly through longline, trawl, and gillnet operations, with fins, meat, and liver oil all commercially valuable. Its low reproductive rate makes populations highly vulnerable to sustained fishing pressure. Coastal habitat degradation, linked partly to agricultural runoff and land-use change near nursery areas, along with shifting prey distributions associated with climate change, compound these pressures.

Conservation responses include regional catch limits, finning bans, and listing under international agreements such as the Convention on Migratory Species, which has prompted some countries to introduce protective measures or fishing restrictions. Enforcement and data collection remain inconsistent across its range.

Given continued fishing pressure, slow reproduction, and incomplete management coverage, the species' population trend remains downward, and its classification as Critically Endangered reflects a significant risk of further decline without stronger international coordination.

School sharks inhabit temperate continental shelf waters from the surface to depths of 550 meters, preferring sandy and muddy bottoms. Juveniles utilize shallow coastal bays and estuaries as nursery areas, while adults range across deeper offshore waters of the continental shelf.