There are two theories: the sound mimics a feeding catfish (food competition) or acts as a mating call. Either way, a correctly produced sound forces the fish to rise from the bottom. It's vital that your gear is ready for a strike and that the line capacity on the spool is enough to fight a giant.
Wood (apple, oak) is prized for its "organic" sound and buoyancy. Metal is durable and offers perfect blade geometry. Carbon fiber combines lightness and strength. The choice is a matter of preference; with proper technique, any material will work, effectively raising fish to your bait.
The technique requires muscle memory but is accessible to everyone. The goal is to create an air pocket that pops loudly upon exit. Beginners find it easier to start with convex heads. Usually, 1–2 trips are enough to produce a consistent sound and stop hitting the boat's side with the tool.
The sonar displays catfish rising as thick lines moving from the bottom toward the bait. If the fish approaches, reduce the frequency of clonking. The clonk allows for a "dialogue" with the predator: if it doesn't strike, try changing the rhythm while monitoring its every move on the screen.
Classics include nightcrawlers, mussel meat, mole crickets, or live bait. The bait should be 2–5 meters above the bottom. Use heavy-duty hooks and strong tackle, as clonking attracts trophies capable of stripping a reel spool in seconds during their first run.
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