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29,646-acre Dublin Bay. Middle saltwater fishing map with official INFOMAR survey bathymetry, measured-cell fishing spots, official fish evidence, seasonal forage guidance, access context and current-rule links. The middle trip-scale survey reach of Dublin Bay, retaining only official survey-backed seabed cells that pass the Ireland release gates. The water tops out around 109 ft. The depth chart comes from INFOMAR (Geological Survey Ireland and Marine Institute) bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Here is how the season plays out for each species, straight from the data behind the map.
Traced from the shoreline, Dublin Bay - Middle runs 29,643 acres with 61 miles of edge. An index of 2.5 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. The shallow band under 15 ft claims about 19% of the surface — that's where the groceries are. End to end it runs roughly 20.7 mi, about 6.4 mi across. The nearest mapped water is Dublin Bay - Inner, 5 mi to the west.
Marine Institute spawning, nursery, observation and range layers support the principal surveyed pelagic and groundfish. IFI's national and regional sea-angling publications support additional habitat-compatible recreational targets. This is occurrence and search guidance, not equal abundance, a section-level population estimate or a promised catch. The roster may combine exact-water monitoring with habitat-filtered official regional evidence; it does not imply that every species is equally abundant throughout the mapped section.
| Species | Evidence basis | Count / date |
|---|---|---|
| Bass (European Seabass) | official species listing | — |
| Mackerel (Atlantic Mackerel) | official species listing | — |
| Herring (Atlantic Herring) | official species listing | — |
| Whiting (Whiting) | official species listing | — |
| Flounder (European Flounder) | official species listing | — |
| Plaice (European Plaice) | official species listing | — |
| Sole (Common Sole) | official species listing | — |
| Thornback ray (Thornback Ray) | official species listing | — |
| Brill (Brill) | official species listing | — |
| Thick-lipped grey mullet (Thick-lipped Grey Mullet) | official species listing | — |
| Garfish (Garfish) | official species listing | — |
| Cod (Atlantic Cod) | official species listing | — |
Official species-evidence source.
In spring, european seabass run shallow here, mostly 3 to 25 ft. Midsummer fish sit out in 2 to 30 ft before dropping to 10 to 55 ft for winter. Fall european seabass concentrate at Shoreline point, a good-rated point around 27 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a surface lure or a paddle-tail soft plastic most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 25 ft | dawn & dusk | Shoreline point (27 ft) | Paddle-tail soft plastic, Shallow minnow plug |
| Summer | 2 to 30 ft | dawn & dusk | Shoreline point (27 ft) | Surface lure, Paddle-tail soft plastic |
| Fall | 4 to 40 ft | dawn & dusk | Shoreline point (27 ft) | Slim metal lure, Minnow plug |
| Winter | 10 to 55 ft | midday | INFOMAR measured channel edge (60 ft) | Slow soft-plastic shad, Suspending minnow |
Early season atlantic mackerel use the shallows, holding in 5 to 45 ft. Summer is a 15 to 80 ft game here, winter a 27 to 109 ft one. The chart's best answer is INFOMAR measured current seam — current seam, 49 ft, prime for fall. Best bite is early morning and the evening. Tie on a feather rig or a small vertical jig and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 45 ft | dawn & dusk | INFOMAR measured current seam (49 ft) | Mackerel feather rig, Small silver jig |
| Summer | 15 to 80 ft | dawn & dusk | Sharp break (17 ft) | Feather rig, Small vertical jig |
| Fall | 10 to 65 ft | dawn & dusk | INFOMAR measured current seam (49 ft) | Compact silver jig, Sparse feather rig |
| Winter | 27 to 109 ft | midday | Deepest basin (107 ft) | Small deep jig |
In spring, atlantic herring run shallow here, mostly 5 to 25 ft. Midsummer fish sit out in 15 to 50 ft before dropping to 20 to 60 ft for winter. Summer atlantic herring concentrate at Sharp break, a good-rated drop-off around 17 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a herring feather rig or a small silver jig most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dawn & dusk | INFOMAR measured shoal (24 ft) | Small herring feather rig, Micro jig rig |
| Summer | 15 to 50 ft | dawn & dusk | Sharp break (17 ft) | Herring feather rig, Small silver jig |
| Fall | 10 to 40 ft | dawn & dusk | Sharp break (17 ft) | Small feather rig, Compact silver spoon |
| Winter | 20 to 60 ft | midday | Sharp break (17 ft) | Small silver jig, Sparse feather rig |
Spring puts whiting in skinny water — 15 to 55 ft is the zone. As the season builds they drop to 20 to 70 ft, wintering in 15 to 70 ft. Fall whiting concentrate at INFOMAR measured channel edge, a prime-rated channel edge around 60 ft. Warm-month bites cluster around early morning. A small vertical jig covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 15 to 55 ft | dawn & dusk | INFOMAR measured channel edge (60 ft) | Small silver jig, Two-hook feather rig |
| Summer | 20 to 70 ft | dawn | INFOMAR measured channel edge (60 ft) | Small vertical jig |
| Fall | 10 to 60 ft | dusk | INFOMAR measured channel edge (60 ft) | Small silver jig, Sparse feather rig |
| Winter | 15 to 70 ft | dusk | INFOMAR measured channel edge (60 ft) | Compact vertical jig |
Early season european flounder use the shallows, holding in 5 to 25 ft. Summer is a 6 to 35 ft game here, winter a 15 to 50 ft one. The chart's best answer is Feeding flat — feeding flat, 29 ft, prime for summer. Best bite is early morning and the evening. Tie on a bottom jig with spinner blade and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 25 ft | dusk | Sharp break (17 ft) | Small bucktail dragged on bottom |
| Summer | 6 to 35 ft | dawn & dusk | Feeding flat (29 ft) | Bottom jig with spinner blade |
| Fall | 8 to 40 ft | dusk | Sharp break (17 ft) | Compact bottom jig |
| Winter | 15 to 50 ft | midday | Sharp break (17 ft) | Small bottom jig |
Spring puts european plaice in skinny water — 8 to 35 ft is the zone. As the season builds they drop to 6 to 40 ft, wintering in 25 to 80 ft. Spring european plaice concentrate at Feeding flat, a prime-rated feeding flat around 29 ft. Warm-month bites cluster around early morning and the evening. A light spooned bottom rig or a beaded trace covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 8 to 35 ft | dusk | Feeding flat (29 ft) | Beaded flowing trace |
| Summer | 6 to 40 ft | dawn & dusk | Feeding flat (29 ft) | Light spooned bottom rig, Beaded trace |
| Fall | 10 to 50 ft | dusk | Feeding flat (29 ft) | Beaded bottom trace |
| Winter | 25 to 80 ft | midday | INFOMAR measured channel edge (60 ft) |
Dublin Bay - Middle also holds common sole (3 to 30 ft in summer), thornback ray (10 to 65 ft in summer), brill (6 to 50 ft in summer), thick-lipped grey mullet (1 to 18 ft in summer), garfish (2 to 20 ft in summer), atlantic cod (27 to 109 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Count 7 structure marks on this chart. The deepest, Deepest basin, sits near 107 ft.
Access data: Marine Institute — Fishing Ports. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Ireland waters are set by the Inland Fisheries Ireland (current sea-angling regulations) — and special regulations can apply to Dublin Bay - Middle specifically, so confirm the current rules before you fish. Check the current national and water-specific rules before every trip, including bass measures, the 2026 recreational pollack controls, salmon and sea-trout licences and river-specific status, protected areas, harbour directions, private land and local signs. A mapped fishing port or measured seabed feature is not permission to fish, park, launch or enter a working harbour.
Check the official Ireland fishing regulations →
Department of Climate, Energy and the Environment (2026 salmon and sea-trout status) →
Check special-area and water-specific rules →
Check official shore-access information →
Dublin Bay - Middle is about 109 ft (33 m) deep at its deepest point. The depth chart comes from INFOMAR (Geological Survey Ireland and Marine Institute) bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Official coastal monitoring from Marine Institute and Inland Fisheries Ireland informs the european seabass, atlantic mackerel, atlantic herring, whiting, european flounder, european plaice, common sole, thornback ray, brill, thick-lipped grey mullet, garfish, atlantic cod roster for Dublin Bay - Middle. The mixed roster combines exact-water records where available with habitat-filtered regional evidence; not every species is documented at this exact water, and it is not a promise of equal abundance or a catch on a particular trip.
INFOMAR measured current seam is the top-rated area: a current seam in about 49 ft of water that rates prime for atlantic mackerel in fall. The map above holds the full rated-spot list for every species and season.
For european seabass, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Dublin Bay - Middle is regulated by the Inland Fisheries Ireland (current sea-angling regulations). Check the official Ireland regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Dublin Bay - Inner 5 mi · Dublin Bay - Outer 5 mi · Dundalk Bay - Outer 38 mi · Dundalk Bay - Middle 39 mi · Carlingford Lough - Outer 45 mi, IRL/UK · Llyn Dinam 65 mi, UK · Llyn Penrhyn 66 mi, UK · Wexford Harbour and Rosslare Bay - Rosslare North 67 mi · Wexford Harbour and Rosslare Bay - Wexford Outer North 70 mi · Llyn Alaw 70 mi, UK · Llyn Coron 70 mi, UK · Strangford Lough - South 74 mi, UK
See how Dublin Bay - Middle stacks up: best atlantic herring lakes in Ireland · best european flounder lakes in Ireland · best garfish lakes in Ireland · best european seabass lakes in Ireland
Browse all Ireland fishing maps. See every water on DepthScout. Bathymetry credit: INFOMAR (Geological Survey Ireland and Marine Institute) INFOMAR All Survey bathymetry mosaic (Source-survey vertical references retained in the INFOMAR All Survey mosaic; 100% measured, 0% source-interpolated). How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.