The Galong people, or Galo a people, form some of the major indigenous communities in Arunachal Pradesh, known for their traditional ecological knowledge and practices. Among the numerous fishing tools, the Eder occupies a special place. Considered to be a rather long fish trap, it is one of the interesting developments, or devices of capturing fish from running water by tribal craftsmanship. Finely split bamboo strips are used for making the Eder, ingeniously woven to form an elongated cylindrical body. Inside the trap is a cone-shaped valve-an innovative element design, which allows fish to come in, but does not let them go out. This inward-pointing valve works like a naturally pointed funnel, drawing the fish to go deeper into the trap with the help of water currents. Furthermore, one end of the trap is tightly woven with bamboo to form a lid that can be removed for obtaining the catch.
An Eder is usually placed between narrow parts of a stream or river, commonly clamped between rocks or driven with stakes, where it has a continuous flow of water. The water current gently ushers the fish into the trap, essentially making fishing an unprocessed method that is still very effective without compromising the aquatic ecosystem. The Eder speaks not only for its functionality but also for the bond enjoyed by the Galo with nature through low-impact fishing and renewable materials. It has a long ancestry as a cultural heritage that has passed from one generation to another among the tribe's oral and practical history.