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17,135-acre Mulroy 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 Mulroy Bay, retaining only official survey-backed seabed cells that pass the Ireland release gates. The water tops out around 150 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. Species by species, here's what the data says the year looks like.
Drawn out, this is 17,142 acres of water rimmed by 63 miles of bank, with a single island in the mix. The 3.4 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. The shallow band under 15 ft claims about 17% of the surface — that's where the groceries are. End to end it runs roughly 11.2 mi, about 8.6 mi across. Closest neighbour on DepthScout: Lough Swilly - Outer, 7 mi northeast 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 | — |
| Thick-lipped grey mullet (Thick-lipped Grey Mullet) | official species listing | — |
| Garfish (Garfish) | official species listing | — |
| Sea trout (Sea Trout) | 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. Shoreline point is the standout, a point at roughly 33 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 | open water | Paddle-tail soft plastic, Shallow minnow plug |
| Summer | 2 to 30 ft | dawn & dusk | Shoreline point (33 ft) | Surface lure, Paddle-tail soft plastic |
| Fall | 4 to 40 ft | dawn & dusk | Shoreline point (33 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 62 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 | Shoreline point (33 ft) | Mackerel feather rig, Small silver jig |
| Summer | 15 to 80 ft | dawn & dusk | Sharp break (41 ft) | Feather rig, Small vertical jig |
| Fall | 10 to 65 ft | dawn & dusk | INFOMAR measured current seam (62 ft) | Compact silver jig, Sparse feather rig |
| Winter | 30 to 120 ft | midday | INFOMAR measured basin (127 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 41 ft, rated good for summer 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 | open water | Small herring feather rig, Micro jig rig |
| Summer | 15 to 50 ft | dawn & dusk | Sharp break (41 ft) | Herring feather rig, Small silver jig |
| Fall | 10 to 40 ft | dawn & dusk | Sharp break (41 ft) | Small feather rig, Compact silver spoon |
| Winter | 20 to 60 ft | midday | Sharp break (41 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 62 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 | open water | Small silver jig, Two-hook feather rig |
| Summer | 20 to 70 ft | dawn | INFOMAR measured channel edge (75 ft) | Small vertical jig |
| Fall | 10 to 60 ft | dusk | INFOMAR measured current seam (62 ft) | Small silver jig, Sparse feather rig |
| Winter | 15 to 70 ft | dusk | INFOMAR measured channel edge (75 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 Sharp break first on the milk run — a drop-off near 41 ft that grades good for fall. 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 | open water | Small bucktail dragged on bottom |
| Summer | 6 to 35 ft | dawn & dusk | Feeding flat (40 ft) | Bottom jig with spinner blade |
| Fall | 8 to 40 ft | dusk | Sharp break (41 ft) | Compact bottom jig |
| Winter | 15 to 50 ft | midday | Sharp break (41 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 40 ft, rated prime for summer 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 | INFOMAR measured shoal (30 ft) | Beaded flowing trace |
| Summer | 6 to 40 ft | dawn & dusk | Feeding flat (40 ft) | Light spooned bottom rig, Beaded trace |
| Fall | 10 to 50 ft | dusk | Feeding flat (40 ft) | Beaded bottom trace |
| Winter | 25 to 80 ft | midday | INFOMAR measured channel edge (75 ft) |
Mulroy Bay - Outer also holds common sole (3 to 30 ft in summer), thornback ray (10 to 65 ft in summer), thick-lipped grey mullet (1 to 18 ft in summer), garfish (2 to 20 ft in summer), sea trout (15 to 50 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, INFOMAR measured basin, sits near 127 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 Mulroy 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 →
Mulroy Bay - Outer is about 150 ft (46 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, thick-lipped grey mullet, garfish, sea trout roster for Mulroy 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 62 ft of water that rates prime for atlantic mackerel in fall. The interactive chart above rates every spot for each 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 Mulroy 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.
Lough Swilly - Outer 7 mi · Lough Foyle - Inner 8 mi, IRL/UK · Lough Swilly - Middle 10 mi · Sheephaven Bay - East 11 mi · Mulroy Bay - Inner 11 mi · Lough Foyle - Middle 21 mi, IRL/UK · Lough Foyle - Outer 25 mi, IRL/UK · Sheephaven Bay - West 27 mi · The Rosses and Gweedore Bay - Outer Islands 38 mi · Gweebarra Bay - Outer 45 mi · Donegal Bay - Central West North 51 mi · Donegal Bay - Central East 52 mi
See how Mulroy Bay - Outer stacks up: best sea trout lakes in Ireland · best atlantic herring lakes in Ireland · best european flounder lakes in Ireland · best garfish 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.