Do Catfish Make Noise? Understanding Catfish Clonks & Sounds

As a lifelong angler and outdoor writer, I’ve spent countless hours on the water, and one question consistently pops up among catfish enthusiasts: do catfish make noise? The answer, surprisingly, is yes – and often in a very distinct way. This isn’t the subtle clicking of a trout or the splash of a bass; we’re talking about what many anglers refer to as a “clonk for catfish,” a low-frequency thumping or knocking sound that can be incredibly helpful in locating these bottom-dwelling giants. Understanding what causes these sounds, and learning to identify a clonk, can dramatically improve your success rate. This article will break down everything you need to know about catfish vocalizations, focusing on the experiences and techniques relevant to US anglers.

What Exactly Is a Catfish Clonk?

The “clonk” isn’t a vocalization in the traditional sense, like a bird’s song. It’s a sound produced by the catfish’s swim bladder. The swim bladder is an internal gas-filled organ that helps the fish control its buoyancy. Catfish, particularly larger species like flathead, channel, and blue catfish, can contract muscles around the swim bladder, forcing air against it. This creates a drumming or knocking sound that travels through the water. Think of it like hitting a hollow drum – the swim bladder is the drum, and the muscle contractions are the stick.

But why do they do it? The reasons are still being researched, but the prevailing theories suggest it’s used for communication. This communication can include:

• Attracting Mates: During spawning season, males may use clonks to attract females.
• Establishing Territory: Clonks could serve as a warning to other catfish to stay away from a prime feeding or nesting spot.
• Predator Deterrence: A sudden, loud clonk might startle potential predators.
• General Communication: Catfish may simply use clonks to maintain contact with other individuals in murky water where visibility is limited.

Identifying a Catfish Clonk: What Does It Sound Like?

Describing a sound is tricky, but here’s what most anglers report when they hear a clonk for catfish:

• Low Frequency: It’s a deep, rumbling sound, not a high-pitched ping.
• Thumping or Knocking: Imagine a dull thud or a muffled knock.
• Rhythmic (Sometimes): While not always consistent, clonks often occur in a pattern – a series of thumps with pauses in between.
• Travels Through Water: The sound carries well underwater, especially in still or slow-moving water.

It’s important to differentiate a catfish clonk from other underwater sounds. Here’s a quick comparison:

Sound	Description	Likely Source
Catfish Clonk	Low-frequency thumping, rhythmic	Catfish swim bladder contraction
Boat Motor	High-pitched whine or rumble	Motor propeller
Falling Rocks/Debris	Sharp, distinct impact	Natural erosion or disturbance
Fish Feeding (e.g., Shad)	Rapid clicking or splashing	Schooling baitfish

Experienced anglers often develop a “feel” for recognizing a clonk. It takes practice, but the more time you spend on the water, the easier it will become. You can also find audio examples online to help train your ear – search for “catfish clonk sound” on platforms like YouTube. REI’s Expert Advice section has a good overview of underwater sounds for anglers.

How to Detect Catfish Clonks: Gear and Techniques

Detecting these subtle sounds requires the right equipment and techniques. Here’s a breakdown:

Hydrophones: The Key to Listening

A hydrophone is an underwater microphone. These devices are specifically designed to pick up sounds in water and are essential for reliably detecting do catfish make noise. There are several types available, ranging in price and sensitivity:

• Basic Hydrophones: Affordable options that connect to a standard audio recorder.
• Digital Hydrophones: Offer higher fidelity and often include built-in amplifiers and filters.
• Hydrophone Systems: Complete packages with hydrophone, amplifier, headphones, and recording device.

When choosing a hydrophone, consider the frequency range. Catfish clonks are low-frequency sounds, so a hydrophone that’s sensitive to lower frequencies (below 500 Hz) is ideal. Leave No Trace principles remind us to minimize disturbance to aquatic life when using any underwater equipment.

Using Your Hydrophone Effectively

1. Positioning: Lower the hydrophone into the water, ideally near structure where catfish are likely to congregate (e.g., submerged logs, rock piles, deep holes).
2. Sensitivity: Adjust the amplifier’s sensitivity to maximize sound pickup without introducing excessive noise.
3. Listen Carefully: Use headphones to block out external sounds and focus on the underwater environment.
4. Recordings: Record your sessions to analyze the sounds later and identify patterns.

Beyond Hydrophones: Other Clues

While hydrophones are the most reliable method, you can also look for other clues:

• Surface Disturbances: Sometimes, a strong clonk can create a subtle ripple on the water’s surface.
• Vibrations: If you’re fishing from a boat, you might feel a slight vibration through the hull.
• Fish Finder: While not directly detecting sound, a fish finder can show you large fish holding near the bottom, which could be the source of the clonks.

What to Do When You Hear a Clonk

Hearing a clonk for catfish is exciting! Here’s how to capitalize on it:

1. Pinpoint the Location: Try to determine the direction the sound is coming from. Move your boat or adjust your position to get a clearer signal.
2. Present Your Bait: Immediately present a bait near the source of the sound. Cut bait, live bait, or prepared baits all work well.
3. Be Patient: Catfish may not strike immediately. Let your bait sit and soak for a while.
4. Experiment: If you don’t get a bite, try different baits, depths, or presentations.

Species Variations: Which Catfish Clonk the Most?

While all three major US catfish species (channel, blue, and flathead) are capable of producing clonks, some are more vocal than others. Flathead catfish are generally considered the most prolific clonkers, likely due to their larger size and more powerful swim bladders. Blue catfish also clonk frequently, especially during spawning season. Channel catfish are known to make sounds, but their clonks are often quieter and less frequent.

Ethical Considerations and Conservation

As responsible anglers, it’s crucial to minimize our impact on the environment. When using hydrophones, avoid disturbing sensitive habitats or harassing fish. The National Park Service provides guidelines for responsible fishing in national parks. Furthermore, be mindful of local fishing regulations and practice catch-and-release whenever possible to help conserve catfish populations for future generations. The USDA Forest Service also offers resources on sustainable fishing practices.

Final Thoughts on Catfish Sounds

So, do catfish make noise? Absolutely. Learning to recognize and interpret these sounds, particularly the distinctive clonk for catfish, can give you a significant edge in your pursuit of these impressive fish. It requires patience, practice, and the right equipment, but the rewards – landing a trophy catfish – are well worth the effort. Remember to fish responsibly, respect the environment, and enjoy the thrill of the chase!

Want to learn more about advanced catfish fishing techniques? Check out our article on "Mastering Catfish Bait Selection" or explore our guide to "Finding the Best Catfish Holes."