Fish traps

Fish Trap (Nasse) for Fishing and Aquaculture

A fish trap is a passive fishing or aquaculture device, commonly used to catch or hold fish and crustaceans.

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Apollo Eel Trap

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The trap is a cage-like structure, usually cylindrical or elongated, with one or more funnel-shaped entrances that allow fish to enter but prevent them from escaping.

Materials

Traditional: wicker, bamboo, rattan.
Modern: plastic-coated wire mesh, nylon netting on a rigid frame.
Stability: floats (plastic or cork) and weights (stone or metal).

Use in Fishing

Placed on the bottom or near banks, often baited (fishmeal, food waste, plants).
Targets: freshwater fish (tilapia, carp, catfish, eel), crustaceans (crayfish, shrimp).
Passive fishing: fish enter attracted by bait or water current.

Use in Aquaculture

Monitoring tool: sampling fish stock (size, weight, health).
Selective harvest: capture market-size fish or broodstock.
Temporary holding: floating traps can keep fish alive before sale or transport.

Advantages

Simple, cheap, durable.
No energy consumption.
Some selectivity (mesh size, funnel design).
Low environmental impact.

🔹 Limitations

Passive method (yield depends on fish density and attractiveness).
May trap non-target species.
Needs monitoring to avoid fish mortality from lack of oxygen or predation.