What Sea Creatures Live in the North Sea?

The North Sea — a shallow, productive shelf sea — hosts rich, commercially vital marine life across diverse habitats.

Fish (200+ species)

• Demersal (bottom): Cod, haddock, whiting, plaice, sole, turbot, brill, halibut.
• Pelagic (mid-water): Herring, mackerel, sprat, sandeel, anchovy — keystone for food web.
• Elasmobranchs: Spiny dogfish, starry ray, thornback ray.

Shellfish & Crustaceans

• Bivalves: Mussels (blue, horse), oysters (native, Pacific), cockles, razor clams, scallops.
• Crustaceans: Brown crab, lobster, Norway lobster (langoustine), pink shrimp, brown shrimp.

Invertebrates

• Echinoderms: Sea urchins, starfish (common, spiny), brittle stars, sea cucumbers.
• Cnidarians: Moon jellyfish, lion’s mane, soft corals (dead man’s fingers), hydroids.
• Sponges: Boring, encrusting, glass sponges (deep).
• Worms: Polychaetes (lugworm, ragworm), peanut worms.

Plankton & Base of Food Web

• Phytoplankton: Diatoms, dinoflagellates — spring bloom drives productivity.
• Zooplankton: Copepods (Calanus), krill, fish larvae — critical for herring, sandeels, juveniles.

Megafauna (Seasonal/Resident)

• Marine mammals: Harbor porpoise, white-beaked dolphin, minke whale, gray/harbor seals.
• Seabirds: Gannets, puffins, kittiwakes, guillemots, fulmars — massive colonies (Bass Rock, Farne Islands).

Pressures

Overfishing, bottom trawling, nutrient runoff, wind farm expansion, warming, acidification — all reshaping communities. Cod recovery remains fragile.

The North Sea is Europe’s marine breadbasket — but its bounty requires careful stewardship.