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80,531-acre Dublin Bay. Outer 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 outer 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 134 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 - Outer runs 80,398 acres with 55.7 miles of edge. The basin is a simple one (shoreline index 1.4) — close to a bowl, so the structure on the chart matters more than the bank. Roughly 0% of the water is 15 ft or less, the band where the food chain lives. Tip to tip the water measures near 21.1 mi with a 7.6-mi widest point. Closest neighbour on DepthScout: Dublin Bay - Middle, 5 mi west of here.
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. Summer pushes them deeper, 2 to 30 ft, and winter fish settle into 10 to 55 ft. INFOMAR measured shoal is the standout, a gravel shoal at roughly 29 ft, rated good for fall european seabass. Time it for early morning and the evening. 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 | Feeding flat (25 ft) | Paddle-tail soft plastic, Shallow minnow plug |
| Summer | 2 to 30 ft | dawn & dusk | Feeding flat (25 ft) | Surface lure, Paddle-tail soft plastic |
| Fall | 4 to 40 ft | dawn & dusk | INFOMAR measured shoal (29 ft) | Slim metal lure, Minnow plug |
| Winter | 10 to 55 ft | midday | open water | Slow soft-plastic shad, Suspending minnow |
Early season atlantic mackerel use the shallows, holding in 5 to 45 ft. Expect a summer slide to 15 to 80 ft, then a winter hold in 30 to 120 ft. Put INFOMAR measured current seam first on the milk run — a current seam near 60 ft that grades prime for fall. In summer the feeding windows fall in 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 point (46 ft) | Mackerel feather rig, Small silver jig |
| Summer | 15 to 80 ft | dawn & dusk | INFOMAR measured current seam (60 ft) | Feather rig, Small vertical jig |
| Fall | 10 to 65 ft | dawn & dusk | INFOMAR measured current seam (60 ft) | Compact silver jig, Sparse feather rig |
| Winter | 30 to 120 ft | midday | Deepest basin (134 ft) | Small deep jig |
In spring, atlantic herring run shallow here, mostly 5 to 25 ft. Summer pushes them deeper, 15 to 50 ft, and winter fish settle into 20 to 60 ft. Sharp break is the standout, a drop-off at roughly 6 ft, rated good for fall atlantic herring. Time it for early morning and the evening. 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 | Feeding flat (25 ft) | Small herring feather rig, Micro jig rig |
| Summer | 15 to 50 ft | dawn & dusk | open water | Herring feather rig, Small silver jig |
| Fall | 10 to 40 ft | dawn & dusk | Sharp break (6 ft) | Small feather rig, Compact silver spoon |
| Winter | 20 to 60 ft | midday | INFOMAR measured current seam (60 ft) | Small silver jig, Sparse feather rig |
Spring puts whiting in skinny water — 15 to 55 ft is the zone. Warm water sends them out to 20 to 70 ft; cold water stacks them in 15 to 70 ft. INFOMAR measured current seam is the standout, a current seam at roughly 60 ft, rated good for fall whiting. Plan around early morning in the warm months. 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 current seam (60 ft) | Small silver jig, Two-hook feather rig |
| Summer | 20 to 70 ft | dawn | INFOMAR measured channel edge (74 ft) | Small vertical jig |
| Fall | 10 to 60 ft | dusk | INFOMAR measured current seam (60 ft) | Small silver jig, Sparse feather rig |
| Winter | 15 to 70 ft | dusk | INFOMAR measured channel edge (74 ft) | Compact vertical jig |
Early season european flounder use the shallows, holding in 5 to 25 ft. Expect a summer slide to 6 to 35 ft, then a winter hold in 15 to 50 ft. Put Feeding flat first on the milk run — a feeding flat near 25 ft that grades prime for spring. In summer the feeding windows fall in 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 | Feeding flat (25 ft) | Small bucktail dragged on bottom |
| Summer | 6 to 35 ft | dawn & dusk | Feeding flat (25 ft) | Bottom jig with spinner blade |
| Fall | 8 to 40 ft | dusk | Feeding flat (25 ft) | Compact bottom jig |
| Winter | 15 to 50 ft | midday | Sharp break (6 ft) | Small bottom jig |
Spring puts european plaice in skinny water — 8 to 35 ft is the zone. Warm water sends them out to 6 to 40 ft; cold water stacks them in 25 to 80 ft. Feeding flat is the standout, a feeding flat at roughly 25 ft, rated prime for spring european plaice. Plan around early morning and the evening in the warm months. 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 (25 ft) | Beaded flowing trace |
| Summer | 6 to 40 ft | dawn & dusk | Feeding flat (25 ft) | Light spooned bottom rig, Beaded trace |
| Fall | 10 to 50 ft | dusk | Feeding flat (25 ft) | Beaded bottom trace |
| Winter | 25 to 80 ft | midday | INFOMAR measured channel edge (74 ft) |
Dublin Bay - Outer 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 (34 to 134 ft in summer). Pick any of them on the map above for rated spots and bait picks.
7 pieces of structure are mapped here — Deepest basin, around 134 ft, is the deepest of them.
The complete Marine Institute Fishing Ports layer returned no port point inside this operational section. DepthScout does not substitute a nearby road, beach or community slipway as verified public fishing access; confirm legal access, parking, tides and local restrictions before visiting.
Private land and private launches need the owner's permission — please ask first.
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 - Outer 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 - Outer is about 134 ft (41 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 - Outer. 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 60 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 - Outer 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 - Middle 5 mi · Dublin Bay - Inner 10 mi · Dundalk Bay - Outer 39 mi · Dundalk Bay - Middle 41 mi · Carlingford Lough - Outer 45 mi, IRL/UK · Llyn Dinam 60 mi, UK · Llyn Penrhyn 60 mi, UK · Llyn Alaw 65 mi, UK · Llyn Coron 65 mi, UK · Wexford Harbour and Rosslare Bay - Rosslare North 67 mi · Llyn yr Wyth-Eidion 70 mi, UK · Wexford Harbour and Rosslare Bay - Wexford Outer North 70 mi
See how Dublin Bay - Outer 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.