Atlantic Cod

Fascinating facts about the Atlantic Cod

• A single Atlantic cod can live up to 25 years and attain sexual maturity between ages 2 and 8, varying between populations.
• When a school of cod migrates, the biggest members act as scouts, eating a wider variety of prey and more food than the fish trailing behind. Smaller cod benefit by staying in the group, where they snag more meals than they would alone. The size-based “leader-follower” system shows how teamwork lets even the tiniest cod survive the long journey.
• In the wild, cod can sprint between 2 cm/s and 54 cm/s, averaging about 9 cm/s, and in a single hour they cover roughly 100 to 226 m. Their daytime speed is higher, matching their habit of hunting more actively when there’s light. These modest bursts let them chase down herring and squid while still conserving energy for long migrations.
• A rise of just 2.5 °C (5 °F) can boost a cod’s metabolic rate by 15-30 %, forcing it to work harder to stay warm. To offset this cost, cod dive deeper into cooler water by day and rise to warmer surface layers at night. This temperature-driven shuffling reveals how even a few degrees can reshape where cod live and feed.
• Heavy fishing in the 1990s wiped out more than 95 % of the historic biomass of several cod stocks, and even after bans the populations have barely recovered. The loss of this apex predator sparked a trophic cascade, letting lobsters, crabs and shrimp flourish unchecked. The ripple effect highlights cod’s pivotal role in keeping North Atlantic ecosystems balanced.

At a glance

About the Atlantic Cod

The Atlantic cod (Gadus morhua) glides through the cold waters of the North Atlantic with a mottled brown-green back speckled with spots that fade to a silvery belly, a vivid stripe tracing its lateral line. It inhabits the continental shelf from the shoreline down to 300 m (1,000 ft), ranging from Cape Hatteras, North Carolina, around Greenland and the Labrador Sea in the west, to the Bay of Biscay, the Baltic Sea, the North Sea, the Hebrides, Iceland and the Barents Sea in the east. Individuals typically reach 100–140 cm (40–55 in) and 25 years of age, though giants over 180 cm (70 in) and 50 kg (110 lb) have been recorded. Cod form size-structured shoals, with larger scouts leading migrations inland for feeding while smaller members benefit from the collective, gaining more consistent meals than they would alone. Their diet shifts with size: juveniles gorge on crustaceans, while adults dominate on fish such as herring, capelin and sand eels, supplemented by squid, mussels and even occasional cannibalism. A surprising trait lies in their temperature-sensitive physiology, just a 2.5 °C (5 °F) drop can raise metabolic costs by 15–30 %, prompting cod to dive deeper into colder layers by day and rise to warmer surface waters at night to maintain energy balance.

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