According to reports, police seized three different varieties of fish from their possession.
Officials said that the fish, locally known as Burka Cheng or Pipli Cheng and are known to be exceptionally beautiful.
A police team from the Mangaldoi Sadar Police Station led the operation during which the poachers were caught.
They have been identified as Rafiqul Islam and Abdul Rashid. The police later handed them over along with the seized fishes to the forest department so as to prosecute them under conservation laws.
Officials also informed that the fishes are worth around Rs 25,000 in the black markets.