Seno de Mayo

Saltwater
Sound

Seno de Mayo

Saltwater
Sound

Sq. miles: 20
Boat Ramps: 0
Access Points: 0
Species: 1

Seno de Mayo is a prominent sound located within the immense Lago Argentino in the Santa Cruz province of Argentine Patagonia. It forms part of the iconic Los Glaciares National Park, a UNESCO World Heritage site, and is situated in the southwest arm of the lake. This glacially-fed sound extends towards the base of the Mayo Mountain, from whose southwestern flank the Perito Moreno Glacier flows. The landscape is characterized by dramatic Andean peaks, deep blue waters, and the proximity to one of the world's most famous glaciers, creating a fishing environment of unparalleled scenic grandeur. The sound's waters are cold and exceptionally clear, influenced by glacial melt.

Santa Cruz licenses and regulations4 to check before you go

Species & education

Learn what type of fish are at Seno de Mayo and what's needed to catch them.

Find which waters have the species you want to catch

Perca

Percichthys trucha

Fishing spots, boat ramps & amenities

Learn how to get on Seno de Mayo. Uncover great fishing access points, boat ramps, and all the facilities you need for an unforgettable day on the water. Some locations shown may border or include private property. Always check property boundaries and applicable regulations before visiting. onWater's Public & Private Land layer can help you plan your access with confidence.

Given the shore-fishing-only restriction, productive spots are limited to areas of the coastline that are physically accessible by foot. Points of land, rocky outcrops, and mouths of any small feeder streams that enter the sound would be natural areas to target, as they can concentrate baitfish and attract predatory trout and salmon. The underwater structure is dominated by the dramatic topography of the lake floor, with likely steep drop-offs near the glacier face and mountain walls.

Know where you can legally fish on Seno de Mayo

See public and private land boundaries along the water, turn on private parcels with owner details to know where permission is required, and find land-trust parcels that offer permitted fishing access.

Santa Cruz licenses and regulations

Santa Cruz Boating Regulations

Boating in Argentina is regulated nationally by the Prefectura Naval Argentina, not by the province - covering recreational-vessel registration, the boat-operator licence (habilitacion nautica), and navigation safety.

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Santa Cruz Fishing License

Official SIPESQ permit system of the Santa Cruz government (Secretaria de Estado de Pesca y Acuicultura) for the provincial recreational fishing permit. Since 2023 Santa Cruz no longer participates in the unified Patagonian scheme - a Santa Cruz permit is valid only in Santa Cruz waters.

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Santa Cruz Fishing Regulations

Official provincial Reglamento de Pesca: season dates, catch-and-release rules, bag limits, and gear restrictions (no natural bait, no multiple hooks).

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Santa Cruz Stream Access Laws

No distinct stream-access statute page; access provisions are contained within the provincial fishing regulation (the same Reglamento de Pesca).

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Take Seno de Mayo with you

The onWater Fish app keeps this water's access points, species and conditions in your pocket, with the tools you use once you're there.

Use the map without signal
Download the map around Seno de Mayo to use it offline when coverage drops.
Log your catches here
Keep a private fishing journal for Seno de Mayo to find where and when fish are biting for you.

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