Fish trap

People use traps to catch fish.

Some traps stay in the water. They can be made of stone or wood.

Other traps are small pots. They can be made from a jar or a bottle.

People use food to lure fish inside. The fish swim in through a small hole. Then they cannot get out.

Traps help people get food from the water.

People all over the world use traps to catch fish.

There are two main types of traps. Some stay in rivers or tidal areas. These are permanent structures made of stone or wood.

Other traps are small and portable. We call these pot traps. They often look like a bottle or a jar.

Many pot traps use an inverted funnel. This is a hole that gets smaller inside. A fish swims through the wide part. It cannot find its way back out the small end. Some people use bait to lure the fish inside.

Some traps can even be made from soda bottles. People cut the top and push the tabs inward. This makes the funnel shape. They drill holes so water can move through.

Traps help people get food. They can also catch crabs or lobsters. Some traps are very old. In South Africa, some stone traps are 3,000 years old. At Budj Bim, people made stone canals 6,600 years ago. These helped them catch eels.

Fish traps are clever tools used to catch fish and other helpful aquatic animals.

People all over the world use them to find food. There are two main ways these traps work. Some are permanent structures that stay in a river or a tidal area. Others are small, portable tools called pot traps or bottle traps. These are often lifted out of the water after they have been sitting for a while.

Using traps is a tradition found in almost every culture on Earth.

Most portable traps work using a special shape called an inverted funnel.

This is an opening that gets much narrower as it goes inside the trap. A fish swims through the wide part to reach bait. Once inside, the fish cannot find its way back out through the tiny end. Some modern traps use a thick steel wire frame shaped like a heart.

Chicken wire is stretched around this frame to create a mesh. The mesh wraps around and then tapers into the inside of the trap. This design makes it very easy for fish to enter but hard to leave.

Humans have been building fish traps for thousands of years.

In South Africa, some stone walls used as traps are 3,000 years old. Even older systems exist at a place called Budj Bim. There, indigenous people built canals over 2 km long to catch eels.

These canals are part of a system that is at least 6,600 years old. This makes it older than the famous Pyramids of Giza. In Australia, the Brewarrina fish traps on the Barwon River also caught huge numbers of fish as water levels changed.

There are many different kinds of traps for different animals and places.

In Japan, heavy earthenware pots are used to catch octopuses. These octopuses enter the pot to find shelter and protection. Lobster pots often have two parts called a "kitchen" and a "parlour." The lobster enters the kitchen for bait and then moves into the parlour where it is caught.

In the Philippines, people use Bubu traps made of bamboo or rattan. These are shaped like boxes or domes to fit on coral reefs.

While traps are helpful, they can sometimes cause problems for the environment.

Lost traps can become marine debris that stays in the ocean. For example, fishers in Bristol Bay, Alaska, lost 31,600 crab traps in just two years. In the Chesapeake Bay, people lose or leave behind 12 to 20 percent of their crab traps every year. These lost traps can continue to catch animals by mistake. Some traps can even catch protected animals like the platypus in Australia. It is important to use traps that are safe for the water.

A fish trap is a specialized tool designed to capture fish and other valuable aquatic animals.

These devices are used globally to harvest food or for commercial purposes. Traps are almost universal in human culture. It appears they were invented many times independently across different parts of the world. They range from massive, permanent structures in rivers to small, portable containers. Using these tools helps people manage resources in both fresh and saltwater environments.

Most traps function through a specific mechanical design. One common method uses an inverted funnel to control movement.

This opening is wide at the entrance but narrows significantly as it leads into the trap. An animal swims through the wide opening, often attracted by bait. Once inside, the animal cannot navigate back through the narrow end. Modern cage traps often use a thick steel wire frame shaped like a heart.

Chicken wire is stretched around this frame and tapers toward the interior. This ensures the mesh opening bends back to its narrow state, preventing escape.

There are two primary categories of fish traps. The first type consists of permanent or semi-permanent structures. These are placed in specific locations like rivers or tidal areas to catch animals as they move. The second type includes portable bottle or pot traps.

These are often baited to attract prey and are periodically lifted out of the water by people. Some traps are specialized for specific habitats, such as the Bubu traps used in Southeast Asia. These are made of bamboo or rattan and are shaped to fit the uneven terrain of coral reefs.

Human history is deeply connected to the development of trapping technology.

In South Africa, some intertidal stonewall traps date back 3,000 years. Even older systems exist at Budj Bim in southern Victoria. Indigenous people there created an elaborate system of canals, some exceeding 2 km in length.

This system of aquaculture is at least 6,600 years old. This makes it older than the Pyramids of Giza. In Australia, the Brewarrina fish traps on the Barwon River were used to catch large numbers of migratory fish during floods.

Different animals require different trapping methods and structures.

In Japan and the Mediterranean, heavy earthenware pots are used to catch octopuses. These animals enter the pots seeking shelter and protection rather than being lured by bait. Lobster pots are often constructed in two distinct parts. The lobster enters a section called the "kitchen" to find bait. It then moves into a second section called the "parlour," where it becomes trapped. In the Philippines, Salambáw are raft-operated lift nets that use a crane mechanism to raise large nets.

While traps are effective, they can cause significant environmental challenges.

Lost or abandoned traps contribute to the problem of marine debris. In Bristol Bay, Alaska, fishers lost 31,600 crab traps during a two-year period. In the Chesapeake Bay, between 12 and 20 percent of crab traps are lost or abandoned every year. These abandoned traps can continue to catch animals unintentionally. They can also capture protected species, such as the platypus in Australia. Using biodegradable materials can help reduce these long-term impacts.

Some researchers look at the natural world as a giant version of these tools.

The Mediterranean Sea is sometimes described as the world's largest fish trap. It has an area of about 2.5 million square kilometers. The sea is shaped in a way that mimics a bottle trap. It is easy for fish to swim from the Atlantic Ocean into the Mediterranean through the narrow neck at Gibraltar. However, it is very difficult for them to find their way back out. This geological feature creates a massive, natural collection system for marine life.