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86,855-acre Lagrange Bay Australian saltwater fishing map showing only directly measured AusBathyTopo 2026 cells, source-qualified fishing spots, official regional fish evidence, seasonal forage context, access guidance and current-rule links. Trip-scale surveyed footprint within Lagrange Bay. An official Australian bay evaluated inside a compact 24-kilometre trip-planning window centred on the Composite Gazetteer feature. The public outline is limited to retained direct AusBathyTopo survey cells, not a legal or navigational boundary. The displayed footprint is not a legal boundary or a claim of complete named-water coverage. The water tops out around 71 ft. The depth chart comes from Geoscience Australia / AusSeabed bathymetric survey data, so the contours are survey-derived rather than computer-modeled. What follows comes from the same scoring engine that paints the spots above.
Traced from the shoreline, Lagrange Bay runs 86,847 acres with 60.9 miles of edge. Index 1.5 on the shoreline: a few honest points and pockets, nothing labyrinthine. The shallow band under 15 ft claims about 21% of the surface — that's where the groceries are. Figure 18.7 mi of water from one end to the other, 14.2 mi at the beam. Closest neighbour on DepthScout: Desault Bay, 26 mi southwest of here.
Regional occurrence does not mean equal abundance, child-specific catch rate, retention permission or a promised catch. Live state, territory, Commonwealth, protected-area and local rules always control. 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 |
|---|---|---|
| barramundi (Barramundi) | official species listing | — |
| golden snapper (Golden Snapper) | official species listing | — |
| black jewfish (Black Jewfish) | official species listing | — |
| king threadfin (King Threadfin) | official species listing | — |
| queenfish (Queenfish) | official species listing | — |
| giant trevally (Giant Trevally) | official species listing | — |
| mangrove jack (Mangrove Jack) | official species listing | — |
| Spanish mackerel (Narrow-barred Spanish Mackerel) | official species listing | — |
| coral trout (Coral Trout) | official species listing | — |
Official species-evidence source.
When the water first warms, barramundi slide up into 2 to 18 ft. There's no big seasonal slide here — summer means 2 to 18 ft, winter 11 to 35 ft. If you only fish one area, make it Sharp break: a drop-off around 15 ft that scores good in fall. In summer the feeding windows fall in early morning and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 18 ft | dawn & dusk | Sharp break (15 ft) | see map |
| Summer | 2 to 18 ft | dawn & dusk | Sharp break (15 ft) | see map |
| Fall | 2 to 25 ft | dawn & dusk | Sharp break (15 ft) | see map |
| Winter | 11 to 35 ft | midday | Sharp break (26 ft) | see map |
Come spring, look for golden snapper tight to the bank in 8 to 35 ft. Through summer count on 8 to 35 ft; the winter hold is 19 to 71 ft. Start at Sharp break. It's a drop-off holding about 26 ft of water and rates good come fall. Prime time lands in early morning and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 8 to 35 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Summer | 8 to 35 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Fall | 8 to 56 ft | dawn & dusk | Sharp break (26 ft) | see map |
| Winter | 19 to 71 ft | midday | Sharp break (26 ft) | see map |
The spring pattern is a shallow one: black jewfish in 8 to 35 ft. The depth story barely changes: 8 to 35 ft through summer, 17 to 71 ft in winter. Top water on the chart: Deepest basin, a deep basin in the 70 ft range, prime in winter. Time it for early morning and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 8 to 35 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Summer | 8 to 35 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Fall | 8 to 63 ft | dawn & dusk | Sharp break (26 ft) | see map |
| Winter | 17 to 71 ft | midday | Deepest basin (70 ft) | see map |
When the water first warms, king threadfin slide up into 2 to 16 ft. There's no big seasonal slide here — summer means 2 to 16 ft, winter 10 to 35 ft. If you only fish one area, make it Shallow measured flat: a feeding flat around 2 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 16 ft | dawn & dusk | Shallow measured flat (2 ft) | see map |
| Summer | 2 to 16 ft | dawn & dusk | Shallow measured flat (2 ft) | see map |
| Fall | 2 to 25 ft | dawn & dusk | Shallow measured flat (2 ft) | see map |
| Winter | 10 to 35 ft | midday | Sharp break (26 ft) | see map |
Spring puts queenfish in skinny water — 3 to 25 ft is the zone. Summer fish stay in 3 to 25 ft, and winter fish hold in 15 to 55 ft. Sharp break is the standout, a drop-off at roughly 26 ft, rated prime for fall queenfish. Plan around early morning and the evening in the warm months.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 25 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Summer | 3 to 25 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Fall | 3 to 39 ft | dawn & dusk | Sharp break (26 ft) | see map |
| Winter | 15 to 55 ft | midday | Sharp break (26 ft) | see map |
When the water first warms, giant trevally slide up into 4 to 30 ft. There's no big seasonal slide here — summer means 4 to 30 ft, winter 16 to 71 ft. If you only fish one area, make it Shoreline point: a point around 11 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 30 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Summer | 4 to 30 ft | dawn & dusk | Shoreline point (11 ft) | see map |
| Fall | 4 to 56 ft | dawn & dusk | Sharp break (26 ft) | see map |
| Winter | 16 to 71 ft | midday | Sharp break (26 ft) | see map |
Lagrange Bay also holds mangrove jack (2 to 18 ft in summer), narrow-barred spanish mackerel (8 to 45 ft in summer), coral trout (8 to 35 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Count 18 structure marks on this chart. The deepest, Deepest basin, sits near 70 ft.
No facility from the cited Western Australia Department of Transport Public Boat Ramps (DOT-033) source was spatially attached within 3 km of this directly measured map footprint during the 2026-09-08 audit. This is an evidence gap, not a claim that public access is absent. Check the official portal, live site signs, tides, ramp condition, vessel suitability, fees, parking, working-port restrictions and landowner permissions before travel: https://catalogue.data.wa.gov.au/dataset/boat-ramps
Private land and private launches need the owner's permission — please ask first.
Season dates, license requirements, and size and bag limits for Western Australia waters are set by the WA DPIRD (current recreational-fishing rules) — and special regulations can apply to Lagrange Bay specifically, so confirm the current rules before you fish. Check WA DPIRD's live regional guide, licences, demersal-management measures, species limits, seasonal and spatial closures, marine parks, protected species and permitted gear before every trip. Species available to target can change by bioregion and date; a regional occurrence record is not an open-season signal. A directly measured contour, fishing spot or access lead never grants fishing, retention, port entry, parking or launching permission.
Check the official Western Australia fishing regulations →
WA DPIRD current recreational-fishing guides →
Check special-area and water-specific rules →
Lagrange Bay is about 71 ft (22 m) deep at its deepest point. The depth chart comes from Geoscience Australia / AusSeabed bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Official coastal monitoring from Western Australia Department of Primary Industries and Regional Development regional evidence informs the barramundi, golden snapper, black jewfish, king threadfin, queenfish, giant trevally, mangrove jack, narrow-barred spanish mackerel, coral trout roster for Lagrange Bay. 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.
Deepest basin is the top-rated area: a deep basin in about 70 ft of water that rates prime for black jewfish in winter. Every other rated spot, per species and season, is on the map above.
For barramundi, 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 Lagrange Bay is regulated by the WA DPIRD (current recreational-fishing rules). Check the official Western Australia regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Desault Bay 26 mi · Roebuck Bay - Southwest 27 mi · Roebuck Bay - Central 54 mi · Roebuck Bay - North 60 mi · Carnot Bay 111 mi · King Sound - Sector 29 127 mi · King Sound - Sector 22 135 mi · King Sound - Sector 23 147 mi · King Sound - Sector 40 150 mi · King Sound - Sector 32 153 mi · King Sound - Sector 16 155 mi · King Sound - Sector 41 158 mi
See how Lagrange Bay stacks up: best barramundi lakes in Western Australia · best golden snapper lakes in Western Australia · best black jewfish lakes in Western Australia · best king threadfin lakes in Western Australia
Browse all Western Australia fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. 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.