The Wairau River mouth at Cloudy Bay is one of the most productive surf-and-river fishing spots in Marlborough — a major estuary where the 170 km Wairau meets the sea, supporting large kahawai schools through summer, sea-run brown trout moving up into the river system, and a small salmon presence (the Wairau has a minor salmon run). The mouth area straddles the marine/freshwater boundary, so anglers need to be aware of both Fish & Game (freshwater) and MPI Challenger (marine) rules depending on exactly where they’re fishing.
Practical Information
| Location | Wairau River mouth, Cloudy Bay — north-east of Blenheim |
| Headline species | Kahawai (large numbers, summer schools) — particularly on spinning lures |
| Trout | Sea-run brown trout in lower river / upper estuary |
| Salmon | Small Wairau salmon run — low numbers, opportunistic catches |
| Other species | Red cod, whitebait (in season), occasional surf species |
| Freshwater rules (river) | Nelson/Marlborough Fish & Game licence required for trout/salmon |
| Marine rules (mouth/surf) | MPI Challenger area rules for kahawai and other marine species |
| Best time | Summer for kahawai schools; spring/early summer for sea-run trout |
About the Mouth
The Wairau River mouth is where Marlborough’s largest river spills into Cloudy Bay through a wide gravel estuary. The estuarine zone — and the adjacent surf — is one of the more productive Marlborough land-based fishing spots, with several species concentrating where freshwater meets the sea.
Kahawai are the standard summer target — large numbers gather at the mouth chasing baitfish, and surfcasters along the mouth area regularly take them on spinning lures (metal jigs, soft baits, slow-twitched lures). The Wairau, Wairau Diversion and Awatere mouths are all kahawai-productive in summer.
Sea-run brown trout move up the lower Wairau and into the Ōpaoa system through the season, with the lower river section above the mouth being prime sea-run water. Salmon are present in a small run but the Wairau is not a salmon-target fishery — salmon catches are opportunistic.
Where the Rules Change
The mouth is a regulatory boundary. Trout and salmon fishing requires a Nelson/Marlborough Fish & Game freshwater licence and is governed by the regional Sports Fishing Regulations. Marine species (kahawai, red cod, surf species) are governed by MPI’s Challenger area rules. The specific point where the regulations switch is defined in current Fish & Game and MPI documents — check both before fishing the mouth.
Where to Learn More
FishingMag — Wairau River and Diversion — practical first-person guide to fishing the lower Wairau and mouth, with notes on sea-run trout, kahawai, salmon, red cod and whitebait.
Fish & Game — Wairau Catchment — official freshwater regulations for the Wairau system including the boundary with the marine zone at the mouth.
MPI — Challenger Area Fishing Rules — marine fishing rules for kahawai and other species in the surf and mouth area.
Frequently Asked Questions
Can you catch salmon at the Wairau mouth?
Salmon are present in a small run, but the Wairau is not a primary salmon fishery — catches are opportunistic rather than reliable.
What’s the best season for the Wairau mouth?
Summer for kahawai schools; spring and early summer for sea-run brown trout moving up into the lower river.
Which licence do I need for the Wairau mouth?
Depends on what you’re targeting. Trout and salmon need a Nelson/Marlborough Fish & Game freshwater licence. Kahawai and other marine species fall under MPI Challenger area rules.
What method works for mouth kahawai?
Spinning is the standard approach — metal jigs, soft baits or slowly twitched lures cast into the surf or estuary.
For the wider Wairau River fishery see Wairau River fishing. For the river itself see Wairau River overview.
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