The correct answer is b) Gillnets.
Gillnets are a type of fishing net that is used to catch fish by entangling their gills. They are made of a fine mesh that is suspended in the water, and they are often anchored to the bottom of the seabed or to buoys. Gillnets are a very effective way to catch fish, but they can also be harmful to other marine life, such as dolphins and turtles.
Trawlers are a type of fishing boat that uses a large net to drag along the seabed. They are very effective at catching fish, but they can also damage the seabed and coral reefs.
Longlines are a type of fishing line that is used to catch fish by hooking them in the mouth. They are often baited with fish or squid, and they can be very long, sometimes up to 100 miles. Longlines can be harmful to other marine life, such as dolphins and turtles, because they can become entangled in the line.
Purse seines are a type of fishing net that is used to catch fish by surrounding them. They are made of a fine mesh, and they are often anchored to the bottom of the seabed or to buoys. Purse seines are a very effective way to catch fish, but they can also be harmful to other marine life, such as dolphins and turtles.
Kerala’s traditional fishing communities primarily use gillnets because they are a very effective way to catch fish. Gillnets are also relatively inexpensive to make and maintain, which makes them a good option for small-scale fishermen.