Three wild species. No stocked fish.
The Chilean Patagonia fishery around Puerto Natales holds three wild fly fishing target species: brown trout, sea-run brown trout and king salmon. All are non-native, established more than 100 years ago, and naturally reproducing — there are no stocked fish in our waters.
Brown trout (Salmo trutta) was introduced to Chile between 1905 and 1924 from European stock. King salmon (Oncorhynchus tshawytscha) became established later via escapes from coastal aquaculture and now runs as a self-sustaining Pacific population. Every fish you cast to with us is wild, naturally reproducing and counted against an annual stewardship plan we file with Sernapesca. We practice strict catch-and-release on all trout. Pacific salmon are retained selectively under the agency's invasive-species protocol.
Salmo trutta
Brown trout
Trucha marrón. Spring-creek sippers, the smart fish.
Salmo trutta (anadromous)
Sea-run brown
Trucha marrón de mar. The trophy of the season.
Oncorhynchus tshawytscha
King salmon
Salmón rey. Big shoulders, established Pacific runs.
Brown trout.
Salmo trutta · Trucha marrón / fario
The brown is the prize fish of our spring creeks — old, smart and hard to fool, the most technical sight fishing we offer. A 6-pound brown is a trip-maker. A 12-pound brown is a once-a-season story. We see fish in the 8–14 lb class every January and February in two specific tributaries of Río de las Chinas.
Where & when
- Río de las Chinas — true Spring creek. Sight fishing for browns from January through mid-March on dries.
- Estancia private feeders — three tributaries under exclusive arrangement. December–February for the biggest resident fish.
- Lago Sarmiento shoreline — wading-distance cruisers along the marl flats at dawn. The "big brown" lake — multiple 10+ lb fish landed every season.
- Río Serrano backwaters — March and April, when browns drop down before the sea-run window opens up the lower river.
Average & trophy size
Flies that produce
- Sight-fishing dries — Parachute Adams size 16, CDC Caddis size 14 (tan), foam Beetle size 14 (black) on the marl flats and slow runs of Las Chinas.
- Cripples & emergers — Quigley Cripple size 16, Klinkhåmer size 14, a single fish working a regular feeding lane — drag-free drift on 5X fluorocarbon.
- Streamers — Conehead Bunny Leech size 4 in olive/black; Galloup's Sex Dungeon in natural; an articulated Mini Loop Sculpin (size 6) for tight quarters.
- Hopper — Morrish Hopper size 10 (tan) cast tight to the cut bank from late December through February. The reactive eat from a big brown is the take of the trip.
Behavior notes
- Big browns are territorial and predictable. The largest residents claim a single lie under an undercut bank or log jam and feed on a regular clock. Once you have one located, plan the cast.
- They become nocturnal in midsummer and feed hardest in the last 90 minutes before dark. April brings them into full daylight again.
- Browns spook on shadow, line slap and approach angle before they spook on tippet diameter. Approach from downstream, low, slow.
- Hooked browns often run for the structure that holds them. Side pressure and a heavier 0X tippet on streamer rigs is non-negotiable.
Verifiable fact
Our largest landed brown trout is a 14-pound resident male taken in February 2024 in a Spring tributary of Río de las Chinas, on a size 10 tan Morrish Hopper cast 18 inches off an undercut bank. The fish measured 78 cm and was released after a 12-minute fight on a 5-weight Scott Centric.
Sea-run brown trout.
Salmo trutta (anadromous) · Trucha marrón de mar
The sea-run is the trophy of the Patagonian season. Chrome bullets in from the Última Esperanza Sound between late February and the close of the season. Average fish run 5 to 8 pounds. Fish over 15 pounds are landed every March. Our best week, March 2023, produced four sea-runs over 18 pounds across three rods.
Where & when
- Río Serrano lower section — primary sea-run water. Mid-February through April 15.
- Última Esperanza estuary — saltwater drift chasing chrome cruisers in late March and April.
- Tributary mouths after high tide — fresh fish stack on incoming tide; the first three hours after the turn are the window.
- Peak month — March is the highest density. April brings fewer fish but the largest individuals of the year.
Average & trophy size
Flies that produce
- Conehead Bunny Leech — size 2 and 4, olive/black or all black, dressed long. The single most productive sea-run pattern we tie.
- Sunray Shadow — Atlantic salmon classic on a 4-inch tube. Skated across the swing at dawn.
- Yuk Bug — size 2, black with rubber legs, dead-drifted under an indicator on the deepest holding water.
- Intruder-style flies — size 1.5 trailing hook, purple/black or pink/black, dropped on a fast-sinking poly leader during high water.
- Lines — 7-weight rod, integrated Skagit head, T-11 sink tip 10 ft. Bring a floating 7-weight as backup for top-water surface skating in April low water.
Behavior notes
- Sea-runs hold deep through the heat of the day and move into tailouts and shallow seams from late afternoon to dusk. The last hour of light is the most productive of any 24.
- Pods of fresh fish move on the rising tide. Time your beat to the tide chart, not the clock — we plan beats around tides every March and April day.
- Aggressive grabs on the swing — strip-set firmly, do not trout-set. Lifting the rod on a sea-run will lose the fish nine times out of ten.
- The biggest sea-runs are loners and often the second or third fish through a pool, not the first.
Verifiable fact
Our largest landed sea-run is a 21-pound 4-ounce hen taken on the Río Serrano in March 2023 on a size 4 Black Conehead Bunny Leech, 7-weight rod and T-11 sink tip. The fish measured 92 cm, was photographed in the net and released within 60 seconds.
King salmon.
Oncorhynchus tshawytscha · Salmón rey / chinook
The king is the heaviest fish that runs our water. Escaped from coastal aquaculture in the 1980s and now established as a self-sustaining Pacific population, kings push into the Serrano system from late December through February. Average fish run 8 to 14 pounds; we put fish over 20 pounds in the net every season.
Where & when
- Río Serrano main stem — kings stage in the deepest holes from January through mid-February. Boat-assisted access for the lowest pools.
- Tributary mouths — fresh fish hold on the seam where the cold tributary meets the warmer main river, particularly mid-morning.
- Última Esperanza estuary — late December, before fish push upriver. Saltwater chasing on bright streamers from the skiff.
- Peak window — January 15 through February 15. After mid-February kings begin spawning and fly fishing them is no longer productive.
Average & trophy size
Flies that produce
- Comet-style flies — size 1/0 pink/orange with chartreuse butt. The original Pacific king pattern, still the producer.
- Intruder — pink/purple on a 2-inch shank with a size 2 trailing hook. Fast-sink Skagit head, dead-drift swing.
- Flesh flies — flesh-pink rabbit strip size 1, dead-drifted off an indicator in deeper holding water.
- Egg-sucking Leech — size 2 black with a pink bead, swung through the staging pools.
- Lines & rod — 8-weight rod with a 30-ft Skagit head and T-14 sink tip. Bring 20-lb tippet. Your trout setup will not land this fish.
Behavior notes
- Kings in fresh-run condition are aggressive on bright color and movement. As they near spawn they shut down and become a snag risk — we stop targeting them by February 15.
- The strike is a heavy stop, not a grab. Strip-set hard, then keep tension. Most kings are lost in the first 30 seconds when the angler does not set firmly enough.
- Plan the fight before the take. Decide on which side of the boat or river you want to land the fish before you cast. A 20-pound king on an 8-weight will run 100+ yards downstream.
- Fresh fish are silver-bright with light spotting on the back. Color up to deep red and olive as spawn approaches.
Verifiable fact
King salmon first appeared in Chilean Patagonian rivers in the early 1980s as escapes from Pacific coast salmon farms. The Río Serrano was confirmed as a naturally reproducing king river in a 2008 INFOR / Universidad Austral study that documented juvenile parr at 4 sampling stations. Our largest landed king is a 27-pound buck from February 2025.
Which species to target, by month.
If you only have a week, this is how we match species to the calendar.
November
Brown trout slowly waking from spring, taking streamers in high water. Too early for salmon and sea-run.
December
Browns coming onto dries in the spring creeks, king salmon arriving in the estuary.
January
Big resident browns on dries. King salmon in the holding pools of the Río Serrano. The most complete fishing month.
February
Same as January with the addition of the first sea-run scouts in the last week of the month. Stable weather, lowest wind.
March
Sea-run brown trout peak. Trout fishing remains excellent. Kings shutting down.
April
Sea-run trophies; trout fishing slows but the largest browns of the year come out at dusk. Cold mornings, fewer rods on the water.
Common questions about the fish.
No. Brown trout was introduced to Chile between 1905 and 1924 from European stock. It has been naturally reproducing for over a century and is now a fully wild, self-sustaining population.
There are no stocked fish in the rivers and lakes we guide. Every fish you catch was born wild.
Our largest landed sea-run brown trout is a 21-pound 4-ounce hen caught in March 2023 on the Río Serrano on a size 4 Black Conehead Bunny Leech.
Our largest resident brown trout is 14 pounds, taken in February 2024 in a Spring tributary of Río de las Chinas. Our largest king salmon: 27 pounds (February 2025).
Yes. The Spring creeks around Puerto Natales — particularly Río de las Chinas and its feeders — are clear, slow and shallow enough for true sight fishing from January through March.
Polarized glasses are mandatory and a 12–14 ft leader tapered to 5X fluorocarbon is standard. Bring a wide-brim hat that does not throw shine.
Sea-run brown trout enter the rivers from late February and peak in March and early April. Fish over 15 pounds are landed every season.
Best water: Río Serrano lower section and the estuary of the Última Esperanza Sound. Plan a 5+ day trip in March to give the run a fair chance.