European Flounder

Habitat Distribution

• Native to UK and Irish coastal waters; found all around Britain and Ireland, from Scottish sea lochs to the English Channel and Irish Sea.
• A bottom-dwelling flatfish of shallow inshore water — estuaries, tidal creeks, sandy beaches and muddy bays are its core habitat.
• Unusually tolerant of fresh water: flounder move well up into rivers and can be caught miles from the sea in tidal reaches.
• Spawning fish move offshore into deeper open water in late autumn and winter, returning inshore as water warms in spring.

Key Locations

• Estuaries of major English rivers — Thames, Severn, Humber, Exe — hold good flounder populations through autumn and into winter.
• Tidal creeks and harbours along the Cornish coast, including Fowey and Charlestown, are known for clear-water sight-fishing opportunities.
• Scottish sea lochs and the tidal reaches of west-coast rivers produce flounder well into freshwater territory.
• The North West coast of England and Wales, including the estuaries managed by the North Western IFCA, holds consistent populations year-round.

Specific Spots

• Estuaries and tidal creeks are the most reliable marks — flounder follow the tide onto mudflats and sandbanks to feed, then drop back into channels as the tide ebbs.
• The junction where a freshwater stream or drain enters an estuary concentrates flounder; they're drawn to the invertebrates disturbed by the influx.
• Sandy or muddy gullies between sandbanks hold fish at low water — flounder sit in the deeper channels waiting for the tide to push food to them.
• In clear, shallow harbours and creeks, fish can be spotted resting on the bottom and sight-fished with small lures worked slowly across the substrate.