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Tons of squid: the North Sea is warming and now octopuses are also arrivingPhoto by edmondlafoto on Pexels
Science
Climate

Tons of squid: the North Sea is warming and now octopuses are also arriving

Meteored Portugal15 September 2026 at 12:04

The North Sea is undergoing a significant transformation in its marine populations. What was a rarity nine years ago now represents about one-fifth of fish catches in the region. The nets of Belgian fishermen, which previously brought up mainly crabs and cod, now bring tons of octopuses and squid.

The cause of this change is global warming. The temperature in the southern North Sea, a shallow water region, has risen by approximately 4°C over the last hundred years. This change in climatic conditions created a perfect habitat for octopuses to multiply, as their eggs need water to be between 9 and 11°C to develop and hatch.

The food chain of the North Sea has changed drastically, with consequences for the entire marine ecosystem. This transformation was explained by Hans Polet, scientific director of the Flemish Institute for Agricultural and Fisheries Research, in an interview with Swiss public broadcaster RTS. The warming of the waters is favouring species that previously did not reproduce in this region, replacing the traditional species that fishermen were accustomed to catching.

Why this matters

Belgian fishermen are observing a significant change in their catches, with traditional species being replaced by octopuses and squid, which could affect their economic activity and established fishing practices. This transformation follows decades of water warming and represents a concrete indicator of the impacts of climate change on European marine ecosystems. WHY: Belgian fishermen are facing a new reality in their catches, with traditional species like crabs and cod being replaced by octopuses and squid, already representing one-fifth of catches. This transformation of the North Sea ecosystem, documented by scientist Hans Polet, concretely demonstrates how global warming of 4°C is altering marine life in the region.

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This is our short summary of a report published by Meteored Portugal on 15 September 2026 at 12:04; the full text stays with the publisher. In our feed it sits under Science. We currently carry 4682 items in that section.

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