Skip to content
FishingHQSearch

The Welsh Dee at Mostyn and Flint

Estuary mark · Brackish water · in The Welsh coast and Anglesey

The Welsh bank of the Dee estuary between Flint and the Point of Ayr, where the training walls and the deep channel run close to a shore that is otherwise miles of saltmarsh and sand. The channel is the fishing; the marsh is what you walk over to reach it.

Safety: tides and being cut off — can cause serious injury or death. 2 more points apply here.

What each one does, and what reduces it ↓

FishingHQ describes what this place is, not whether you may fish it. Access, permits and who to ask.

What you can catch here

Documented at this place, grouped by how you would be fishing, with how strongly the sources support each one. This is what has been written down, not a forecast, and being listed is never permission to fish.

From the shore · 8

What these strengths mean
Regular local target
Fishing sources describe this as a normal local target here, not merely as caught.
Seasonal
Well supported, and concentrated in part of the year rather than spread through it.
Recorded here
At least one credible public account of this species being caught here. That is all it means.
How breadth is counted
A fish documented at six marks is shown as six marks: breadth never raises the strength on its own. A fishery account describes the fishing; a recorded catch reports one specific catch. How evidence is weighed.

Fish documented nearby, not here

Nothing below has been documented at The Welsh Dee at Mostyn and Flint itself. Each one has been documented at a named place on the same ground, and the places are listed with it. Treat this as what the water around here holds rather than as a catch list for this mark.

Also documented at neighbouring places

One or two accounts each, on the ground around here. Enough to know the fish is caught in these waters; not enough to say anything about this place.

From the shore

How people fish it

Practised here: Sea fishing.

Methods the sources name for this ground. Each one is explained in full on its own page.

  • Ledgering

    Fishing a bait on the bottom held by a weight, with no float — the simplest way to fish at distance, in depth, or in wind.

  • Surfcasting

    Casting heavy baited tackle from a beach into surf — a method defined by distance, by tide, and by reading water that all looks the same.

The ground and the water

The ground
The Welsh bank of the Dee estuary between Flint and the Point of Ayr, where the training walls and the deep channel run close to a shore that is otherwise miles of saltmarsh and sand. The channel is the fishing; the marsh is what you walk over to reach it.
Exposure
Sheltered inside the estuary; the weather that matters here is what the wind does to the flats.
Tide and flow
Large range with the flood filling the estuary fast over flat ground, and the channel the only water at low tide.

Through the year

Flatfish through the year, plaice in summer, school bass and mullet in summer, codling in winter.

The months the sources attach to each species here. Where a species carries no season it is listed underneath rather than assumed to run through the year.

The months in which each species is recorded as caught at this location.
SpeciesJFMAMJJASOND
Atlantic cod — seasonal, recorded in November, December, January, February.
European plaice — seasonal, recorded in June, July, August, September.
European sea bass — seasonal, recorded in June, July, August, September.
Thick-lipped grey mullet — seasonal, recorded in June, July, August, September.

Recorded here with no season stated: Dab, European flounder, Common sole, Whiting.

Safety

Tides and being cut off — Can cause serious injury or death

The flood fills the ground behind an angler before it covers the ground in front, so the water arrives between them and the shore while the position they are standing on is still dry.

What reduces it: Read the tide table before going rather than after arriving, set a leaving time from the tide rather than from the fishing, and identify the exit and how long it takes while the ground is still uncovered.

Moving water and currents — Can cause serious injury or death

Tidal races and overfalls form and disperse with the state of the tide, producing standing waves and fast confused water where flat water was an hour earlier. Small craft caught in a race on the wrong state face conditions that paddling or a small engine will not overcome, and a person swept from rock into a running stream is carried away from the entry point immediately.

What reduces it: Plan against tidal stream timing rather than against wind alone; obtain local knowledge of when each piece of water runs and when it is slack; never launch a small craft near a race without that information; and treat the state of the tide as the go or no-go variable it is here.

Worse when:

  • Spring tides, when the streams run hardest
  • Wind against tide, which stands the water up steeply
  • Any small craft, and kayaks in particular, whose speed is a fraction of the stream's

Cliffs and rock platforms — Can cause serious injury or death

Rock platforms on the north and west put an angler beside deep, fast-moving water, sometimes with a descent that is much harder to reverse than to make. Immersion here is compounded by the stream, which removes any prospect of climbing out where you went in.

What reduces it: Watch a mark for a long period before committing; wear a buoyancy aid; never fish rock alone; plan the exit for a worse sea than the one you arrived in; and know whether the mark is cut off by the tide.

Rules and access

FishingHQ does not know the current access position here. Shore angling in Wales is not rod-licensed, but access rights, landowner permission, local authority and harbour byelaws, national and inshore fisheries measures, and site designations all apply and all change. Check the current position with Natural Resources Wales, the harbour or local authority, and the landowner before going. This water is tidal and transitional, so the freshwater regime may also apply above the tidal limit: FishingHQ does not know the current access position here. Freshwater rod fishing in Wales requires a current rod licence AND separate permission from whoever controls the fishing, which is frequently a club, riparian owner or navigation authority rather than a public body. Close seasons, byelaws and local rules apply and change. Check with Natural Resources Wales and with the controlling club or owner before going.

Who holds the answer:

  • Natural Resources Wales, which administers marine and fisheries regulation in Welsh waters.
  • The local authority and, where one exists, the harbour authority, for access, byelaws and shellfish classification.
  • Natural Resources Wales, for rod licensing, close seasons and fisheries regulation in Wales.
  • The club, association or riparian owner that controls the fishing.
  • The Welsh environmental and fisheries authority, for licensing, sea fisheries rules and enforcement in Wales
  • The relevant local authority, for byelaws and for shellfish harvesting classification and closures
  • The body managing any marine protected area on the stretch concerned
  • The harbour authority for working harbours and the relevant landowner for access points
  • The coastguard, for tidal stream and safety information, and local charter skippers whose knowledge of the races is operative safety information

Nearby fishing

Other publicly documented places within about 40 km, by distance. Positions are approximate public geography and are never exact marks.

The Welsh Dee at Mostyn and FlintPoint of Ayr and TalacreThe ClwydPriory Wharf, BirkenheadOtterspool PromenadeRhylNew Brighton and Perch RockSeaforth RocksLlyn Brenig
The Welsh Dee at Mostyn and Flint and the publicly documented places around it. Approximate positions, not marks. On a narrow screen the plot is wider than the screen and scrolls sideways inside its frame. Positions are approximate by design — they are capped at about a hundred metres and describe where a named public place is, not where fish are and not a mark. Everything plotted here is also listed below.

Sources for this place

  • Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Long-running published description of British sea angling practice by region, ground type and named mark.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly
  • General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated public descriptions of which places are conventionally fished and how, recorded as practitioner consensus rather than as scholarship, and not relied on for access, permission or any current rule.Background and mechanism onlyCitation checked — the work exists and is described correctly
  • British Sea Fishing: Welsh shore marks — British Sea Fishing (Credible secondary source)Relied on for: Mark-by-mark Welsh shore angling: which species are fished for at each named mark, in which season, and with which baits and methods.States this directlyPassage read and verified

How FishingHQ labels evidence is explained in the evidence policy. Last reviewed 2026-08-16.

Share this page