What a Keep Net Does and When to Use One

A keep net is a mesh cylinder or bag that hangs in the water, tethered to the bank or boat, and holds live fish while you continue fishing. Unlike a fish bag that you carry, a keep net stays in place — you land a fish, slip it through the opening, and it swims inside until you're ready to weigh, photograph, or release it. The mesh lets water flow through so fish stay alive for hours.

Keep nets work best in still water or slow current: ponds, lakes, canals, and calm river sections. They're standard in match fishing, where anglers compete on catch weight and need to hold dozens of fish safely. They're also useful for any session where you want to keep fish alive without handling them repeatedly — live bait fishing, photography, or catch-and-release tournaments.

The main trade-off is that keep nets require setup time and a secure anchor point. You can't use one effectively from a moving boat, in heavy current, or where you have nowhere to tie off. For mobile fishing or wading, a sling or bag is faster.

Key Takeaways

  • Keep nets hold fish alive in the water while you fish, using mesh that lets water flow through and keeps fish from escaping.
  • They work in still water and slow current but need a secure tie-off point on the bank or boat.
  • Mesh size matters: smaller mesh (around 6 mm) holds small fish; larger mesh (8–10 mm) reduces drag and works for bigger species.
  • A properly anchored keep net with regular water flow will keep fish alive for 8 to 12 hours, though you should check them every couple of hours.
  • Match fishing rules often specify keep net dimensions and materials, so check your event rules before buying.

Keep Net Size and Mesh Choice

Keep nets come in two main lengths: 1.5 meters (about 5 feet) for small to medium fish, and 2 meters (6.5 feet) for larger species or longer sessions. Diameter ranges from 35 to 50 centimeters. A 1.5-meter net with 40-centimeter diameter is the standard for match fishing and general coarse fishing — it's portable enough to carry but deep enough to hold 20 to 40 fish depending on size.

Mesh size directly affects which fish you can hold and how much water resistance the net creates. A 6-millimeter mesh is tight enough to hold roach, rudd, and small bream without them slipping through, but it creates more drag in current and is harder to clean. An 8-millimeter mesh is the middle ground — it holds most coarse fish and reduces drag. A 10-millimeter mesh is best for pike, perch, and larger species, though smaller fish can slip through if the net isn't handled carefully.

The frame material also matters. Aluminum frames are lightweight and won't rust, making them ideal if you're carrying the net regularly. Steel frames are heavier but more durable if you're setting up in one spot for a full day. Most modern keep nets use aluminum.

How to Set Up and Anchor a Keep Net

Position the keep net 1 to 2 meters from where you're fishing, close enough to land fish easily but far enough that your activity doesn't spook fish inside it. The net should hang vertically in the water with the opening at or just below the surface — this makes it easy to slip fish in and lets you see what's inside.

Anchor the net using the rope or chain attached to the frame. On a bank, tie it to a rod rest, a bank stick driven into the ground, or a heavy object like a tackle box. The anchor point should be solid enough that the net won't drift or flip if a large fish thrashes inside. In a boat, tie it to a cleat or secure point on the gunwale, making sure the rope has enough slack that the net can move with the water rather than being pulled under.

If you're fishing in current, angle the net slightly downstream so water flows through it naturally. A net fighting against current will fill with debris and tire fish faster. In still water, position it where you can see it clearly and where it won't collect leaves or algae from the surface.

Keeping Fish Alive in a Keep Net

A keep net works because mesh allows water to circulate, but that circulation depends on movement. In still water on a calm day, water exchange slows down, and fish can become stressed if the net is overcrowded. Check your net every 1 to 2 hours — if fish are gasping at the surface or hugging the bottom, they need better water flow or the net needs to be moved to a cooler spot.

Temperature matters more than most anglers realize. On a hot day, water in a keep net can warm faster than the surrounding water, especially if the net is in direct sun. Move the net to shade if possible, or partially submerge the frame so the opening sits lower and cooler water enters from below. In winter, the opposite is true — a net in very cold water can stress warm-water fish like carp, so keep sessions shorter.

Overcrowding is the fastest way to kill fish in a keep net. A 1.5-meter net with 40-centimeter diameter can safely hold 30 to 40 small roach or rudd, but only 10 to 15 large bream or carp. If you're catching faster than you expected, either release some fish or switch to a second net. Predatory fish like pike and perch should never share a net with smaller species.

Maintenance and Storage

After each session, rinse the keep net with fresh water to remove algae, mud, and salt (if you've been fishing saltwater). Let it dry completely before storing — a damp net will develop mold and the mesh will rot. Hang it vertically or lay it flat in a cool, dry place.

Check the mesh regularly for tears or holes, especially around the frame where stress is highest. Small holes can be patched with a mesh repair kit, but large tears mean replacing the net. The frame should be inspected for bends or cracks that could catch and tear the mesh or create sharp edges that injure fish.

If you use the net in saltwater, rinse it immediately after each session and consider storing it with a light coat of fresh water to prevent salt crystallization. Aluminum frames won't rust, but salt can corrode the mesh over time if not rinsed.

Keep Nets vs. Other Fish-Holding Methods

A keep net is different from a fish sling, which is a long mesh bag you carry on your shoulder and fill as you fish. Slings are portable and work while wading or moving, but they don't keep fish as cool or as alive as a keep net in still water. A sling is better for mobile fishing; a keep net is better for staying in one spot.

A fish bag or creel is a hard-sided container you carry, often insulated. It's portable and protects fish from sun and damage, but it doesn't provide the water circulation a keep net does. Fish in a bag will stay alive for a few hours, but not as long as in a keep net. Bags are best for short sessions or catch-and-release fishing where you're not holding fish for hours.

For match fishing or long sessions where you need to hold many fish alive and in good condition, a keep net is the standard choice. For everything else, the method depends on how far you're walking and how long you're fishing.

Match Fishing Rules and Keep Net Standards

If you're fishing a match or tournament, check the rules before you buy or bring a keep net. Most match-fishing organizations specify maximum dimensions — typically 2 meters long and 50 centimeters in diameter — and require mesh of a certain size to prevent fish escaping. Some events ban keep nets entirely and require fish to be weighed in a separate weigh net.

The rules exist to keep competition fair and to protect fish welfare. A net that's too large or has mesh that's too loose can give an unfair advantage, and a net with poor water flow can stress fish. If you're new to match fishing, ask the organizer what equipment is allowed before the event.

Frequently Asked Questions

How long can fish survive in a keep net?

In cool, well-oxygenated water with good circulation, fish can survive 8 to 12 hours. In warm or still water, survival time drops to 4 to 6 hours. Check the net every 1 to 2 hours and move it if fish show signs of stress like gasping or lying on the bottom.

Can I use a keep net in a river with current?

Yes, but angle the net downstream so current flows through it naturally. In fast current, the net will fill with debris and tire fish quickly. In slow or moderate current, a keep net works well if anchored securely.

What size keep net do I need for pike or large carp?

A 2-meter net with 50-centimeter diameter and 10-millimeter mesh is best for large predatory fish. Never mix pike or perch with smaller fish in the same net. Large carp can be held in a standard 1.5-meter net, but only one or two at a time.

Do I need to feed fish in a keep net?

No. Fish can survive without food for the duration of a fishing session. Feeding them can foul the water and stress them further. Focus on keeping the water cool and circulating.

What should I do if a fish dies in the keep net?

Remove it immediately so it doesn't foul the water for the other fish. A dead fish will decompose and use up oxygen quickly. If multiple fish are dying, move the net to a different location or release the remaining fish.