It is a battle of wits that every aquarist will eventually lose their sanity to. You have a mission, if you choose to accept it. You need to catch one specific, impossibly fast fish. This task must be done from a heavily decorated tank. Because your opponent has the home-field advantage, is fueled by pure instinct, and can navigate a dense jungle of driftwood and plants with the grace of a ninja, the odds are not in your favor. You are, after all, a giant, clumsy creature with a net. Consequently, this guide is your tactical briefing, providing you with the strategies and tricks you need to successfully extract a single fish without completely destroying your beautiful aquascape or your will to live.
The 45-Minute War Against a Single Tetra
I once spent 45 minutes in a state of escalating fury, dismantling what I considered to be my magnum opus of aquascaping. I removed the perfectly placed driftwood, uprooted the thriving cryptocorynes, and in the end, generally turned my serene underwater world into a chaotic, muddy mess.
All this destruction was caused by one single Neon Tetra that had decided it was time to move to a different tank.
The tetra, for its part, looked smug. It effortlessly dodged my every move with a flick of its tiny tail, meanwhile usingmy beautiful decorations as an elaborate obstacle course. Because of this experience, that day, I was thoroughly outsmarted by a creature with a brain the size of a grain of sand. This guide is forged from the humbling lessons of that defeat.
Why is Catching a Fish in a Planted Tank So Hard?
You are essentially trying to catch a highly agile creature in an environment that is perfectly designed to help it evade capture. As soon as the fish sees a giant net coming, its ancient survival instincts kick in. To the fish, you are a predator, and therefore, this is a life-or-death chase. Consequently, every rock, plant, and piece of wood is a shield, and it will use them all.
Phase 1: How Should I Prepare Before Trying to Catch a Fish?
A good plan is your greatest weapon. Do not just plunge a net into the tank. Preparation is key to reducing stress for both you and all your fish.
- Fast the Fish: Skip feeding your tank for a day before the planned capture. A slightly hungry fish will be less stressed and will produce less waste if you need to temporarily bag it.
- Lower the Water Level: This is the most effective trick in the book. Drain 30-50% of the tank water. This dramatically reduces the vertical space the fish has to maneuver, making it much easier to corner.
- Prepare the Destination: Have your quarantine tank or transport container ready and waiting, filled with water from the current tank. The goal is to minimize the time the fish is out of water.
- Unplug Equipment: Turn off your filters and heaters. This prevents them from being damaged by running dry as the water level drops and stops the filter current from working against you.
Phase 2: What Are the Best Methods for Catching a Fish?
The Two-Net Method: The Classic Pincer Movement
This is the most common and effective technique.
- What you need: Two nets, preferably one slightly larger than the other.
- How it works: Use the larger net as a stationary wall or a slow-moving herding tool. With your other hand, use the smaller net to gently guide or “chase” the target fish towards the larger, waiting net. Most fish will not see the stationary net as a threat and will swim right into it while trying to evade the smaller, moving net. Patience is key. Use slow, deliberate movements.
The “Trap” Method: For the Truly Uncatchable Fish
For that one fish that is simply too smart or too fast, it’s time to outthink it.
- What you need: A clear plastic water bottle, scissors, and a piece of fish food.
- How to build it: Cut the top third (the tapered part) off of the water bottle. Invert this cone and place it back inside the bottle’s opening, creating a funnel.
- How it works: Place a sinking algae wafer or a favorite food pellet inside the bottle trap. Lay the trap on its side on the substrate and wait. A curious and hungry fish will swim in through the wide funnel opening to get the food, but its simple brain will have a very difficult time figuring out how to swim back out through the tiny hole.
The “Herding” Method: The Low-Stress Option
This method is great for catching less frantic fish or for when you want to minimize stress as much as possible.
- What you need: A large, clear container (like a plastic Tupperware or a specimen cup) and one net or a plastic ruler.
- How it works: Instead of chasing, you simply use the net or ruler to gently guide the fish into the large, waiting container. The container is clear and stationary. As a result, the fish often doesn’t perceive it as a threat. It will swim right in.
What Should I Absolutely NOT Do?
- Don’t Chase Frantically: Wildly chasing a fish around the tank with one net is a recipe for failure. Not only will itstress out every single fish in the aquarium, but you will also likely injure the target fish or damage your aquascape.
- Don’t Pin the Fish: Furthermore, never pin a fish against the glass with the rim of the net. Doing so can scrape off its protective slime coat and cause serious injury.
- Don’t Rip Apart Your Scape (Unless It’s a Last Resort): Finally, sometimes you may need to move a large piece of driftwood. Avoid a full teardown unless all other methods have failed.
Sources
- Britannica (Lateral Line System)
https://www.britannica.com/science/lateral-line-system - Aquarium Co-Op (How to Catch Fish)
https://www.aquariumcoop.com/blogs/aquarium/how-to-catch-fish - Practical Fishkeeping (Catching Elusive Fish)
https://www.practicalfishkeeping.co.uk/features/how-to-catch-skittish-fish/ - The Spruce Pets (How to Make a Fish Trap)
https://www.thesprucepets.com/make-your-own-aquarium-fish-trap-2920955 - University of Florida (Stress in Fish)
https://edis.ifas.ufl.edu/publication/FA005
Leave a Reply