For many tribes in the tropics (e.g. the Kutai and Banjar tribes in East Kalimantan, Indonesia), fishing in peatland catchments is their main livelihood. Peatlands are their main resources area. They traditionally catch fishes and reptiles, and collect fuel wood and grass in peatlands. In January and February, fishes migrate into the waters in the peat forest for mating and breeding. During this season fishermen have relatively little catch since most fishes are in the shallow inland waters far inside the peat forest. Fishermen using these artificial ponds, called beje, take advantage of fluctuations in the movement of water or overflow of river water during the rainy season from November to March to trap the fish in artificial ponds or special containers. Fish come into the beje by themselves since they follow the water flow from the river to the peatland.