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Dogtooth tuna ( Gymnosarda unicolor ), Red Sea, Egypt

Dogtooth tuna

A large Indo-Pacific bonito prized by sport anglers.

Photo: Diego Delso, CC BY-SA 4.0, via Wikimedia Commons

The dogtooth tuna is a large marine fish found in tropical Indo-Pacific waters. It belongs to the mackerel family but is classified as a bonito rather than a true tuna. Anglers value it for its fighting ability and rarity, while locals consume it as food despite potential toxin risks.

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  • Males can grow up to 248 cm long and weigh 130 kg
  • Found in tropical Indo-Pacific reefs and seamounts
  • Adults may be ciguatoxic and unsafe to eat
  • Known for aggressive downward runs when hooked
  • Biologically a bonito, not a true tuna

What it is

This species is a pelagic marine fish belonging to the Scombridae family. Although called a tuna, it is biologically a bonito. Adults grow large, with males reaching up to 248 centimetres in length and weighing 130 kilograms. Most observed individuals measure between 40 and 120 centimetres. The body is streamlined with a brilliant blue-green back, silvery sides, and a white belly. Two white tips mark the rear fins near the tail. The lateral line curves noticeably, and the fish keeps its jaws open while swimming.

Where it lives

These fish inhabit tropical waters across the Indo-Pacific region. Their range extends from the eastern coast of Africa, including the Red Sea, eastward to French Polynesia and various Pacific islands, excluding Hawaii. Northern limits reach Japan, while southern boundaries extend to Australia. They prefer offshore reef environments. Smaller individuals stay near shallow reefs, whereas larger adults haunt deep drop-offs, seamounts, and steep underwater walls. They are found at depths ranging from 10 to 300 metres.

How it lives

Dogtooth tuna act as apex predators in non-pelagic settings, sharing this role with giant trevally, Napoleon wrasse, large groupers, and sharks like bull and tiger sharks. They are usually solitary or form small schools. As aggressive opportunists, they feed on small schooling fish and squids. Their diet mainly consists of pelagic species near reefs, such as rainbow runners, mackerel scad, and various fusiliers. Preliminary estimates suggest they can live for at least 20 years.

Dogtooth tuna
A drawing made by EveryFish from what this page says. It is a diagram, not a picture of the real fish.

Fish and people

Anglers and spearfishermen prize this species for sport and food. It is often marketed frozen or canned. However, adults may contain ciguatera toxins, posing a health risk if eaten. Fishing effort has increased recently due to its sporting qualities. Capturing them is difficult because they make high-speed downward runs that cut lines on bottom structures. Sharks also frequently attack hooked or speared fish. Popular fishing destinations include Okinawa, the Maldives, Bali, the Great Barrier Reef, and islands in the Western Pacific like Fiji and Palau.

Images provided courtesy of a multi-partnered collaboration between the Department of Agriculture, Bureau of Fisheries and Aquatic Resources-National Fisheries Research and Development Institute (BFAR-NFRDI), Philippines
Images provided courtesy of a multi-partnered collaboration between the Department of Agriculture, Bureau of Fisheries a. Photo: The U.S. Food and Drug Administration, Public domain, via Wikimedia Commons
Dogtooth tuna ( Gymnosarda unicolor ), Ambalihabe, Madagascar
Dogtooth tuna ( Gymnosarda unicolor ), Ambalihabe, Madagascar. Photo: Poco a poco, CC BY-SA 4.0, via Wikimedia Commons

Questions people ask about Dogtooth tuna

Is the dogtooth tuna a true tuna?

No, despite its name, it is not a true tuna. It belongs to the mackerel family Scombridae but is classified as a bonito. It shares the family with tunas but is a distinct type of fish within that group.

Why is catching dogtooth tuna difficult?

They are hard to land because they make high-speed downward runs when hooked, often cutting lines on deep bottom structures. Additionally, sharks frequently mutilate hooked or speared fish during the fight, adding to the challenge for anglers.

Is it safe to eat dogtooth tuna?

While appreciated as a fine food fish in many areas, adult dogtooth tuna may be ciguatoxic. This means they can carry toxins that cause illness in humans, so caution is advised when consuming larger specimens caught in reef environments.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Dogtooth tuna", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.

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Photo credits on this page

The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.

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