Scientific Anglers Sonar Swillwater Intermediate Fly Line
The Scientific Anglers Sonar Stillwater Intermediate Fly Line is a specialized fly line designed for stillwater fishing, particularly effective for targeting trout and other species in lakes, ponds, and slow-moving waters. Here’s a detailed breakdown of its features and best uses:
Key Features:
1. Sink Rate:
– Intermediate (sinks at ~1.5 inches per second).
– Ideal for fishing just below the surface or at mid-depths, making it versatile for various stillwater conditions.
2. Sonar Technology:
– Features Scientific Anglers’ Sonar Taper, optimized for modern fly fishing techniques like indicator fishing, stripping streamers, or slow retrieves.
– The taper enhances turnover and control when casting larger flies or multiple flies (e.g., nymph rigs).
3. Coldwater Core:
– Designed to remain supple in cold conditions, preventing coiling and stiffness.
– Excellent for early-season or high-elevation stillwaters.
4. Durable Coating:
– AST (Advanced Shooting Technology) coating for smooth shooting and reduced friction.
– Resistant to abrasion and UV damage.
5. Color & Visibility:
– Typically comes in green or blue hues to blend into stillwater environments while remaining visible to the angler for line management.
Best Uses:
– Stillwater Trout Fishing: Perfect for lakes where trout feed on midge pupae, damselfly nymphs, or small baitfish.
– Slow-Sinking Presentations: Effective when fish are suspended in the water column (e.g., during hatches or thermocline feeding).

– Streamer & Nymph Fishing: The intermediate sink rate allows for controlled retrieves of woolly buggers, leeches, or nymph rigs.
– Early/Late Season: Performs well in cold water without becoming stiff.
Compatibility:
– Works best with 5-8 weight rods (depending on model).
– Pairs well with long leaders (9-12 ft) when fishing nymphs or small flies.
– Ideal for full-floating or slow-sinking poly leaders for added versatility.
Alternatives:
– Floating Stillwater Line: If you need a surface presentation (e.g., dry flies or emergers).
– Sonar Stillwater Sink Tip/Sinking Lines: For deeper fishing (e.g., Type III or V sink rates).
Final Verdict:
This line is a top choice for stillwater anglers who need precision, control, and a slow-sinking option. Its taper design and coldwater performance make it a reliable pick for year-round lake fishing.
Would you like recommendations for specific setups or techniques with this line?