Scientific Anglers Sonar Saltwater Intermediate Fly Line
It’s not very often you’ll need to fish topwater flies in the salt. That’s where an intermediate line comes in handy. The SONAR Saltwater Intermediate fly line features a slow-sinking clear head that cuts through the surface and provides an amazing amount of stealth for those wary fish cruising the flats. From redfish and bonefish to permit and tarpon, give yourself an edge that fish won’t be able to see.
Slow sink rate gets flies just below the surface
Engineered for use in salt water
Clear for stealthy presentations
Tropi-Core technology for tropical climates
Sink Rate: 1.25 ips (Intermediate)
SA ID – SA SONAR SW INT WF X I (X = line weight)
| Specification | Detail |
|---|---|
| Sink Rate | 1.25 ips (Intermediate) |
| Application | Saline water fishing |
| Head Type | Slow-sinking clear head |
| Technology | Tropi-Core |
| Line Weight | Indicated by X in SA ID (SA SONAR SW INT WF X I) |
FAQ
What makes the SONAR Saltwater Intermediate fly line suitable for flat fishing?
The slow-sinking clear head allows the line to cut through the surface and place flies just below the water, providing stealth for wary fish like redfish and bonefish that patrol the flats.
Is this line suitable for tropical saltwater environments?
Yes, the Tropi-Core technology is specifically engineered to perform well in tropical climates, offering durability and resistance to saltwater exposure.
What types of fish can this line effectively target?
This line is effective for targeting redfish, bonefish, permit, and tarpon, all of which are known to be cautious and sensitive to surface disturbances.


Frank Lawrence –
Used this line for bonefish fishing on the flats. The clear head stayed almost invisible and the slow sink rate kept the flies just below the surface. Fish were more likely to take the flies, especially in early morning when visibility is low.
Jake Dickens –
Felt a noticeable difference in stealth compared to my previous line. The sink rate is consistent and the line holds up well in saltwater conditions. Would recommend for intermediate saltwater fly fishing.
Jasmine Gill –
Perfect for targeting tarpon in shallow waters. The slow-sinking head gives a natural presentation and fish seem more interested. Tropi-Core feels durable and doesn’t degrade quickly in the sun.