Famous Danish sea trout fly - Polar Magnus Fly
Claus Eriksen – The designer behind the Polar Magnus fly
It is Danish top angler Claus Eriksen from Danish Fishing shop Goo Fishing who is the designer behind the Polar Magnus Fly – Claus Eriksen is known across Scandinavia for this and other great flies like this perfect shrimp imitation – The Polar Magnus is another standart fly in the coastal fly box for the Scandinavian sea trout angler.
Polar Magnus #6 Saltwater
A Scandinavian Sea Trout Classic
Few flies have earned the legendary status of the Polar Magnus. Since the 1990s, this iconic pattern has been a permanent fixture in the fly boxes of Scandinavian sea trout anglers and remains one of the most trusted coastal flies ever developed.
The Polar Magnus combines the profile, movement, and transparency of a natural shrimp with a highly visible silhouette that sea trout find difficult to ignore. Whether fished over shallow sand flats, eelgrass beds, rocky shorelines, or along deeper coastal drop-offs, the fly consistently produces fish throughout the season.
Today, Polar Magnus is regarded as one of the true classics of Scandinavian coastal fly fishing and remains a standard pattern for both experienced and new sea trout anglers.
Designed by Claus Eriksen
The Polar Magnus was designed by renowned Danish fly angler and fly designer Claus Eriksen, known throughout Scandinavia for creating highly effective sea trout flies and realistic shrimp imitations.
Through years of observation and refinement, Claus developed a pattern that perfectly captures the movement and appearance of the small shrimp and crustaceans that make up a significant part of the sea trout’s diet.
The result was the Polar Magnus, a fly that quickly gained popularity across Denmark, Sweden, Norway, and beyond.
A Fly That Works All Season
One of the reasons for the success of Polar Magnus is its versatility. It can be fished effectively throughout the year and performs equally well in cold spring water, summer evenings, and autumn conditions.
The fly excels whenever sea trout are feeding on shrimp and other small crustaceans, making it particularly effective in shallow coastal environments where natural prey is abundant.
Its combination of movement, profile, and natural presentation allows anglers to fish it with confidence in a wide variety of situations.
Product Details
- Fly Name: Polar Magnus Saltwater
- Hook Size: #6
- Target Species: Sea Trout
- Fishing Areas: Coastlines, fjords, bays, estuaries, eelgrass beds, and shallow coastal waters
- Designer: Claus Eriksen
- Country of Origin: Denmark
Why Fish Polar Magnus?
- Legendary Scandinavian sea trout fly
- Designed by Claus Eriksen
- Proven since the 1990s
- Realistic shrimp imitation
- Excellent movement in the water
- Effective throughout the season
- Trusted by generations of coastal anglers
- Essential pattern for Scandinavian sea trout fishing
Polar Magnus remains one of the most influential and successful sea trout flies ever developed and continues to catch fish throughout Scandinavia year after year.
See the other famous Danish sea trout flies in our series
.
.








Ian Stuart (verified owner) –
Andrew W. (verified owner) –