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 gurgle of a trout or the splash of a bass; we’re talking about what many anglers refer to as a “clonk for catfish,” a sound that can be incredibly helpful in locating these bottom-dwelling giants. Understanding what causes these sounds, and learning to identify a catfish clonk, can dramatically improve your success rate. This article will break down everything you need to know about catfish vocalizations, from the science behind them to practical tips for using this knowledge to your advantage.

What Exactly Is a Catfish Clonk?

The “clonk” is a low-frequency thumping or knocking sound, often described as sounding like wood hitting wood underwater. It’s not a consistent sound; it’s sporadic and can vary in intensity. It’s most commonly heard in slower-moving water, like rivers, lakes, and reservoirs, particularly around structure like submerged timber, rocks, and drop-offs. But what’s causing it? For years, it was largely anecdotal, dismissed as boat noises or other underwater disturbances. However, research and increasing angler reports have confirmed that catfish are, in fact, the source of these mysterious sounds.

How Do Catfish Produce These Sounds?

Catfish don’t have vocal cords like mammals. Instead, they create sounds using their swim bladder. The swim bladder is an internal, gas-filled organ that helps them control buoyancy. Catfish can contract muscles around the swim bladder, forcing air against it and creating vibrations. These vibrations travel through the water as sound waves. Larger catfish, with larger swim bladders, generally produce louder and more noticeable clonks. According to research cited by the US Geological Survey, the sounds are likely used for communication, potentially related to attracting mates, defending territory, or even coordinating feeding.

Is it Always a Catfish? Distinguishing a True Clonk

While a clonk for catfish is a strong indicator, it’s crucial to differentiate it from other underwater sounds. Here’s a breakdown of potential imposters:

• Boat Noise: Propeller cavitation, hull creaks, and even the sound of your trolling motor can mimic a clonk.
• Falling Debris: Small rocks or branches falling into the water can create a similar thumping sound.
• Ice Formation/Movement: In colder months, expanding or shifting ice can produce sounds that resemble a clonk.
• Other Fish: Larger fish like carp can sometimes create thumping sounds, though they are generally higher pitched than a catfish clonk.

The key is to listen carefully and consider the context. A true catfish clonk will often be deeper, more resonant, and may be followed by other sounds, like subtle vibrations felt through your rod tip. It’s also more likely to occur near structure where catfish congregate.

Why Do Catfish Make These Sounds? The Purpose of Vocalization

The exact reasons why catfish make these sounds are still being studied, but several theories have emerged. Understanding these potential motivations can help you predict when and where you’re most likely to hear a catfish clonk.

Communication & Mate Attraction

One leading theory is that catfish use these sounds to communicate with each other, particularly during spawning season. Males may use clonks to attract females, establish dominance, or signal their readiness to breed. This is why you might hear increased clonk activity during the spring and early summer months. Leave No Trace principles remind us to be mindful of disturbing spawning grounds, so listen respectfully and avoid excessive noise near potential breeding areas.

Territorial Defense

Catfish are generally solitary creatures, and they may use clonks to defend their territory from rivals. A loud clonk could serve as a warning signal to other catfish, indicating that an area is already occupied. This behavior is more likely to be observed in areas with limited resources or high catfish populations.

Predatory Behavior & Coordination

Some researchers believe that catfish may also use sounds to coordinate hunting efforts. While not definitively proven, it’s possible that clonks could help catfish locate prey or signal to other catfish when a food source has been found. This is a fascinating area of ongoing research.

How to Use Catfish Sounds to Your Advantage: Angling Tactics

Now for the practical part: how can you use your knowledge of do catfish make noise to catch more fish? Here are some effective angling tactics:

1. Listen Carefully: Invest in a good quality underwater listening device (hydrophone) or simply turn off your trolling motor and listen intently. Pay attention to the depth and location of the sounds.
2. Target Structure: Focus your efforts around submerged timber, rock piles, drop-offs, and other structures where catfish are likely to congregate.
3. Use Vibration-Sensitive Tackle: A sensitive rod and line will help you detect subtle vibrations that accompany the clonks.
4. Present Bait Near the Source: Once you’ve identified the location of a clonk, immediately present your bait nearby. Cut bait, live bait, and stink baits are all effective options.
5. Experiment with Bait Presentation: Try different bait presentations to see what the catfish are responding to. Sometimes a slow, bottom-bouncing presentation is best, while other times a slightly more active presentation will trigger a strike.
6. Be Patient: Catfish can be finicky, so don’t get discouraged if you don’t get a bite right away. Keep listening and adjusting your tactics until you find what works.

Equipment for Detecting Catfish Sounds

While you can sometimes hear a clonk for catfish with just your ears, specialized equipment can significantly improve your ability to detect and locate these sounds.

Remember to check local regulations regarding the use of underwater sound devices. Some areas may have restrictions to protect fish populations. The USDA Forest Service website is a great resource for finding information about fishing regulations in national forests.

Responsible Angling & Sound Sensitivity

As anglers, we have a responsibility to minimize our impact on the environment and the fish we pursue. When listening for catfish clonks, be mindful of the following:

• Avoid Excessive Noise: Minimize boat noise and avoid shouting or making loud sounds near potential catfish habitats.
• Respect Spawning Grounds: Avoid fishing near known spawning areas during the breeding season.
• Practice Catch and Release: Release catfish responsibly to help maintain healthy populations.
• Be Aware of Your Surroundings: Pay attention to other anglers and boaters, and avoid creating disturbances.

By following these guidelines, we can ensure that future generations of anglers will continue to enjoy the thrill of catching these magnificent fish. Learning to understand if do catfish make noise and what those sounds mean is a rewarding experience that can elevate your angling game and deepen your connection to the natural world. For more information on responsible fishing practices, check out REI Expert Advice on Fishing Ethics.

Want to learn more about catfish bait selection? Check out our article: The Ultimate Guide to Catfish Baits.

Need help choosing the right catfish rod? Read our review: Best Catfish Rods for Every Budget.