Swordfish

Fascinating facts about the Swordfish

• The IGFA all-tackle record for a swordfish is a 536 kg (1,182 lb) specimen taken off Chile in 1953.
• Heater cells next to the eyes raise the fish’s eye temperature by 10-15 °C above surrounding water, and swordfish can be found from the surface down to 2,878 m (9,442 ft).
• Females outgrow males, with Pacific individuals regularly hitting 3 m (10 ft) and the longest recorded at 4.55 m (14 ft 11 in) and 682 kg (1,500 lb), underscoring sexual size dimorphism that fuels higher egg production in big females. Bigger mothers mean millions of eggs, up to 29 million, entering the ocean each season.
• Swordfish can be found as deep as 2,878 m (9,442 ft) and rise to the surface at night to feed.
• In 2019, North Atlantic fisheries reported catching 1.3 million kg (2.9 million lb) of swordfish, illustrating how human demand can quickly scale to millions of kilograms and why sustainable limits are essential for the species’ future.

At a glance

About the Swordfish

The swordfish (Xiphias gladius) cuts a striking figure in the world’s oceans, its sleek, round-bodied form ending in a long, flat, sword-like bill that can reach a meter in length. Adults shed all teeth and scales, growing to a common length of about 3 m (10 ft) and, in rare cases, to a record 4.55 m (14 ft 11 in) and 682 kg (1,500 lb). Their range spans tropical and temperate waters of the Atlantic, Pacific and Indian Oceans, where they roam from the surface to depths of 550 m (1,800 ft) and, on exceptional dives, as deep as 2,878 m (9,442 ft). Preferring water temperatures of 18–22 °C (64–72 °F) yet tolerating 5–27 °C, they migrate seasonally toward cooler waters to feed, often surfacing at night to chase schools of mackerel, herring, lanternfishes, squid and crustaceans. Though the popular image shows them spearing prey, they more commonly slash larger targets with their bill while swallowing smaller ones whole. A remarkable physiological adaptation sets them apart: heater cells beside the eyes raise ocular and brain temperatures 10–15 °C above ambient water, sharpening vision and hunting efficiency in the dim depths. Their solitary nature, often seen alone or in loose pairs, sometimes breaching the surface to dislodge parasites, adds to the mystique of these swift, powerful predators, whose speed, while often exaggerated, still ranks among the ocean’s fastest swimmers.

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