European Plaice

Fascinating facts about the European Plaice

• A 78-cm European plaice once tipped the scales at 5.7 kg, far beyond the typical 50-70 cm maximum – a size that shows the species can keep growing well past the average adult stage. This rare giant hints at how abundant food and low predation can let flatfish push their growth limits. It reminds us that even common fish can surprise us with extreme individuals.
• When night falls, plaice turn into stealth hunters, slipping over sandy bottoms to pick polychaete worms, crustaceans and bivalves, while 1- to 2-year-old juveniles stick mainly to shrimp. Their diet shift mirrors the changing prey landscape as they grow. It underscores how flexible feeding habits help them thrive across life stages.
• A female plaice in the North Sea may start making eggs as early as three years old, but most wait until age three to join the spawning rush from December to May. She releases batches of eggs every 3–5 days for about a month, a rhythm that spreads the risk of loss. This timing strategy boosts the chances that at least some offspring survive the harsh winter seas.
• Plaice larvae don’t fight the tide; instead they ride it by moving up in the water column on flood tides and down on ebb tides, a behavior called semiactive tidal transport. This vertical shuffle steers them toward shallow intertidal zones where they later settle. It reveals a clever, low-energy way to reach the right habitat without swimming against strong currents.
• North Sea landings of plaice peaked at roughly 200 000 tonnes in the late 1980s, but today catches stay under 120 000 tonnes after stricter management lowered pressure. All stocks now sit within safe biological limits set by ICES. The rebound shows that well-crafted fisheries rules can restore a species that once faced overexploitation.

At a glance

About the European Plaice

The European plaice (Pleuronectes platessa) glides across the sandy and muddy shelves of the North Atlantic, its dorsal side a mottled tapestry of dark green to brown punctuated by irregular orange spots that never fade, even as the fish subtly shifts its hue to match the seabed. Its smooth, scale-covered skin leads to a pearly white ventral surface, while a compact head, less than a quarter of its total length, houses a small terminal mouth whose maxilla barely reaches the right eye, one of the pair perched on the right side of its oval body. Adults can grow to 50–70 cm, with rare giants reaching 78 cm and 5.7 kg, and may live two decades, their dorsal fin bearing 65–79 soft rays and the anal fin 48–59, each preceded by a spine. By night, plaice become stealthy predators, emerging from their daytime burrows to hunt polychaete worms, crustaceans and bivalves, while juveniles under two years favor shrimp. Their life begins in the plankton, where eggs hatch after two weeks and larvae drift for 8–10 weeks, using a clever tidal dance, rising in flood tides and sinking in ebb tides, to ride currents toward shallow intertidal sands. After metamorphosing into their characteristic asymmetrical shape, the youngest settle in tidal pools for up to a week, a puzzling behavior that hints at an ancient survival strategy before migrating to deeper waters. Their main spawning grounds lie in the Southern Bight of the North Sea and the eastern English Channel, where females, maturing as early as three years, release batches of eggs every 3–5 days from December to May.

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