Scientists discovered a new blind groundwater fish species 'Gitchak nakana' in Assam's Goalpara district, marking the first recorded instance of a groundwater-dwelling fish from Northeast India. The tiny, translucent red fish measures about 2 cm in length and exhibits classic subterranean adaptations such as complete blindness, lack of pigmentation, and absence of a skull roof.

The discovery was published in a peer-reviewed journal in early March 2026. It underscores the unexplored biodiversity in Northeast India's aquifer systems. Researchers noted that the fish's isolation in underground water systems makes it highly sensitive to groundwater pollution and overextraction, highlighting the need for aquifer conservation.