Fishing in Nelson Lakes National Park

Nelson Lakes National Park sits at the northern tip of the Southern Alps in the South Island, where glaciers carved out a landscape of deep lakes, beech-forested valleys, and clear mountain rivers.

The park's waters drain into some of the South Island's most significant river systems, and the fishing reflects that alpine character — cold, clear, and best approached on foot. The two anchor lakes are Rotoiti and Rotoroa.

Lake Rotoiti is the source of the Buller River, one of the South Island's major fisheries, and sits close to the village of St Arnaud. Lake Rotoroa lies about 30 minutes further in, surrounded almost entirely by native forest.

Both lakes hold brown and rainbow trout, with fish averaging around 3–4 lbs and larger fish taken regularly. The lakes are deep and cold year-round, which keeps them fishable even through summer.

Shore fishing is productive near the river mouths — where the Sabine and D'Urville enter Rotoroa, and where the Gowan leaves it — but the banks drop away steeply elsewhere, making a boat or water taxi worth arranging.

DoC operates water taxi services on both lakes. The rivers inside the park are the Travers, Sabine, and D'Urville — all wilderness waters reached by DoC tracks and huts. The Travers flows into Rotoiti; the Sabine and D'Urville drain into Rotoroa.

These are fly fishing rivers: clear water, visible fish, technical presentations. The Buller itself begins at Rotoiti and picks up volume quickly as it heads downstream toward Murchison, where it collects the Matakitaki and other tributaries.

Flyfishing is the most effective method in the rivers. Trolling produces on the lakes. The park's infrastructure — tracks, bridges, huts — is genuinely useful for anglers planning multi-day trips into the upper valleys.

The Buller catchment holds a National Water Conservation Order, a recognition of its significance as a fishery. Didymo has affected the mainstem Buller below the park, but the tributary waters, including those within the park, remain in good condition.

Check current regulations with DoC before fishing — the park is administered by the Department of Conservation, and rules specific to park waters apply alongside the standard licence requirements. Getting into the best water here takes time and legs.

That's not a drawback — it's the point.