European plaice

Identification

Plaice is the best-known flatfish of the North Sea, reaching 20 to 40 cm (up to 100 cm maximum). The body is oval and strongly flattened, with both eyes on the right side. The most distinctive feature is the orange to red spots on the brown upper surface — no other North Sea flatfish has this pattern. The underside is pearl white. The skin is smooth with small scales. The head is relatively small with a curved lateral line making a sharp curve above the pectoral fin. Not to be confused with dab (rougher skin, no orange spots) or flounder (spiny scales along the lateral line).

Behavior & ecology

Plaice is a bottom fish that lives on sandy and fine-gravel seabeds in the North Sea, from shallow coastal water to 200 meters depth. It feeds on polychaete worms, thin-shelled bivalves, small shrimp, and mysid shrimp — food it extracts from the sand. Plaice is a master of camouflage: it adjusts its color to the substrate and buries itself. The species makes seasonal migrations: to shallow coastal water in spring to forage, to deeper spawning grounds in winter. Plaice spawns from January to March in the central North Sea at 30 to 50 meters depth. Young plaice grow up in the shallow Wadden Sea and along the coast.

Fishing techniques

Plaice is a popular target for sea anglers, especially when beach fishing. The most effective method is a bottom rig with one or two hooks (size 2–6) with lugworm or ragworm as bait. Plaice take the bait eagerly — the hook is often swallowed deep. The best periods are spring and summer (April–August), when plaice forages in shallow coastal water. Fish on sandy beach sections, sandbanks, and from breakwaters. Groundbait with pieces of shrimp can add extra attraction. Larger specimens are also caught from boats on the North Sea.

In the Netherlands

Plaice is culturally and economically one of the most important North Sea fish — "kibbeling" (battered fried fish) from plaice is a Dutch icon. The North Sea plaice population is one of Europe's best-managed fish stocks, with a healthy biomass after decades of quota policy. The Wadden Sea is a crucial nursery: young plaice grow up in its shallow, nutrient-rich waters. For sport fishers, plaice is a reliable and tasty catch. A minimum landing size of 27 cm applies in commercial fishing. The Dutch beam trawl fleet catches thousands of tons of plaice annually.