Both brown trout and rainbow trout are present throughout the rivers and lakes of Northern Patagonia, and most anglers will catch both species during a week on the water. For the full destination overview, see our complete guide to fly fishing in Northern Patagonia.
Origins in Patagonia
Neither species is native to Patagonia. Brown trout were introduced from Europe in the late 1800s. Rainbow trout were brought from Northern California around the same period. Both have thrived for over a century. All trout in Patagonia are wild — there is no stocking program.
Rainbow Trout
Rainbows are the more abundant species in most rivers. They feed actively on the surface during hatches and are generally less selective than brown trout. Average rainbows run 12 to 20 inches. Fish over 20 inches are caught regularly. A hooked rainbow typically makes long, fast runs followed by jumps. Best rivers for rainbows: Malleo, Quilquihue, and Meliquina for wading; Collon Curá and Aluminé for floating.
Brown Trout
Browns are the more elusive and prized species. They grow larger than rainbows on average and are considerably more selective. Fish over 24 inches are taken regularly on the bigger rivers. Browns are most active during low-light periods and become most aggressive in March and April. Target them with streamers fished along undercut banks and through deep pools. The Chimehuin and Limay are the most celebrated rivers for large brown trout.
Brook Trout
Brook trout are found mainly in high-elevation alpine lakes in LanÃn National Park. They grow to impressive sizes in Patagonia and take dry flies readily.
Key Differences at a Glance
Size: Browns generally grow larger. Rainbows are more abundant. Fighting style: Rainbows run and jump. Browns power through the current. Selectivity: Browns require the most precise presentations. Best time for browns: March and April. Best time for rainbows: December through February.