La Villa de Maria Behety Lodge -Fly Fishing the Rio Grande

Rio Grande

In 1935, John Goodall stocked 60,000 Chilean salmo trutta eggs in 2 tributaries of the 70 km Rio Grande. Today, young Brown Trout spend an average of 2 years in the river before their first migration to the sea where they’ll spend 6 months before returning to the river with an average weight of 6 lbs. Sea Runs that spawn 4 times in the Rio Grande weigh over 20 lbs and some fish have been known to complete the cycle 6 times

Studies show that the Sea Run Browns in Tierra del Fuego’s Rio Grande are about 17% heavier than other sea trout of the same length. Their size and high return rate are factors of low predation, biologically rich salt waters and a strict Catch and Release policy employed by all lodges. Rio Grande’s Sea Run Brown Trout population was estimated at 75,500 adult fish in 2008.

Today, the average daily catch rate on the Rio Grande is an amazing 3-6 fish per rod. The key to success is to adapt your fly fishing technique. Sea Run Browns are rather moody and will strike when the fly is presented well, at the right time and in the right spot. Be flexible with your tactics and listen to your guide. If a fly moving evenly and slowly still does not produce a strike, consider modifying the depth or fly pattern. Fly placement is also a factor. Like other anadromous salmonids, Sea Run Browns generally move up river at night, congregating at the head of the pool in the evening and at tail of the pool in the morning and against cut banks during the middle of the day. On overcast days the fish could be found in the middle of the pools.

Chromed Sea Run Brown Trout begin to enter the Rio Grande lower pools in early December and continue to enter until May. The peak weeks are unpredictable and fall sometime during the busy early January to late March timeframe, but regardless of the month, if conditions are good, the fishing is good. April is often overlooked and can be equally exciting and productive as mid-season. In April, all the fish that are going to return are now in the river with spectacular fall colors and weighting at their peak. Water levels are at their lowest, fish are more concentrated and the strong Tierra del Fuego winds are significantly diminished.