Last updated July 2026
The Wairau River mouth at Cloudy Bay is a productive estuary where the 170 km Wairau River meets the sea, drawing anglers for kahawai schools in summer, sea-run brown trout in the lower reaches, and a small but consistent Quinnat salmon run. The area straddles the freshwater and marine boundary, requiring anglers to follow Nelson/Marlborough Fish & Game rules for trout and salmon or MPI Challenger area rules for marine species depending on the exact location fished. Large numbers of kahawai concentrate at the mouth chasing baitfish, while sea-run trout move upstream from the estuary into the lower Wairau and connected Ōpaoa system. The Wairau Diversion mouth nearby also offers similar opportunities for kahawai and other species. Red cod, whitebait in season, and occasional surf species add to the variety available from the shore.
Practical Information
| Location | Wairau River mouth, Cloudy Bay, north-east of Blenheim |
| Headline species | Kahawai (summer schools, spinning lures) |
| Trout | Sea-run brown trout in lower river and upper estuary |
| Salmon | Small Quinnat salmon run (opportunistic catches, typically 6-20 lb) |
| Other species | Red cod, whitebait (seasonal), occasional surf species |
| Freshwater rules | Nelson/Marlborough Fish & Game licence required for trout and salmon |
| Marine rules | MPI Challenger area rules for kahawai and marine species |
| Best time | Summer for kahawai; spring to early summer for sea-run trout; incoming tide for salmon |
About the Wairau River Mouth
The Wairau River mouth forms a wide gravel estuary where Marlborough’s longest river enters Cloudy Bay. This transitional zone concentrates fish where freshwater outflows meet the sea, creating one of the region’s more reliable shore-based fishing locations. Kahawai gather in large schools during summer and autumn, readily taking metal jigs, soft baits and other spinning lures cast from the surf or estuary edges. The Wairau and Wairau Diversion mouths are both noted for consistent kahawai action in these months.
Sea-run brown trout enter the lower Wairau from the sea and move upstream, with good opportunities in the river section immediately above the mouth. These trout also access the Ōpaoa (Opawa) River system via connections from the lower Wairau. Quinnat salmon make a small but regular run up the Wairau, with fish typically in the 6-20 lb range; catches are opportunistic rather than the focus of a dedicated fishery.
The mouth area offers a mix of estuarine and surf fishing. Anglers should note tidal influences, with incoming tides often productive for salmon. Access points include roads leading to the south bank and nearby reserves, though conditions can be windy and exposed.
Regulations at the Mouth
The Wairau River mouth marks the boundary between freshwater and marine fishing zones. Trout and salmon fishing requires a current Nelson/Marlborough Fish & Game freshwater licence and must follow the regional sports fishing regulations. Marine species such as kahawai fall under MPI’s Challenger area amateur fishing regulations, which do not require a licence but impose bag and size limits. The precise regulatory line is defined in official Fish & Game and MPI documents; anglers must check both sets of rules for their intended target and location before fishing.
What Visitors Often Say
Anglers report reliable kahawai action on spinning gear during summer, with fish often schooling close to the mouth and responding well to metal jigs and soft plastics. Many note the added excitement of possible sea-run trout or salmon encounters while targeting kahawai.
Visitors describe the lower river and estuary as accessible for shore fishing, with productive sessions on incoming tides. Some mention variable conditions due to wind and the need to watch for the regulatory boundary when changing targets.
Where to Learn More
Fish & Game NZ — Wairau Catchment: Official information on the Wairau fishery, access, and regulations including the river mouth.
MPI — Challenger Area Fishing Rules: Current marine fishing regulations and bag limits for the area including the river mouth.
Fish & Game NZ — Wairau Access: Details on river mouth fishing opportunities and access points for the Wairau and Diversion.
Frequently Asked Questions
Can you catch salmon at the Wairau mouth?
Yes, a small but consistent Quinnat salmon run occurs, with opportunistic catches possible especially on incoming tides; the Wairau is not a primary salmon destination.
What’s the best season for fishing the Wairau mouth?
Summer and autumn for kahawai schools; spring through early summer for sea-run brown trout moving into the lower river.
Which licence do I need at the Wairau mouth?
A Nelson/Marlborough Fish & Game freshwater licence is required for trout and salmon. Marine species such as kahawai are covered by MPI Challenger area rules with no licence needed.
What method works best for kahawai at the mouth?
Spinning with metal jigs, soft baits or slowly twitched lures is the standard and effective approach from the surf or estuary.
Are there other species available?
Red cod, seasonal whitebait and occasional surf species can be caught alongside the main targets.
Is the Wairau Diversion also worth fishing?
Yes, the nearby Wairau Diversion mouth provides similar kahawai, sea-run trout and salmon opportunities.
Where can I find current regulations?
Check the latest Fish & Game Nelson/Marlborough sports fishing regulations and MPI Challenger area rules before each trip, as boundaries and limits are clearly defined in official documents.
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