Pune: ‘Helicopter’ Fish Infestation in Ujani Dam Alarms Fishermen, Threatens Native Species

Indapur, 9th October 2025: The rapid spread of the so-called “helicopter fish” in the Ujani Dam has become a growing concern for local fishermen, as the invasive ornamental species is endangering native freshwater fish populations.

Following heavy rainfall this year, the dam filled up quickly, leading to large quantities of fish seed being washed away during water discharge. However, the sudden rise in the population of helicopter fish — typically found in household aquariums — has disrupted the natural aquatic balance.

Fishermen report that traditional freshwater species in the reservoir have drastically declined. The helicopter fish, known for their tough, spiny, scale-covered bodies, are not only outcompeting native species but also damaging fishing equipment. Nets often get torn when these fish become entangled, causing heavy losses to fishermen.

Earlier, the Ujani reservoir was abundant with native fish such as Rohu, Murrel, Catla, Vam, Ghogrya, and Aher. In recent years, however, invasive species like Tilapia have also proliferated. Although Tilapia grow rapidly, they disrupt the natural food chain and hinder the growth of local fish species.

“Recently, prawns have started appearing in the Ujani Dam, which gives us new hope. The natural growth of prawns indicates some positive changes in the water quality. If the state government starts a prawn seed cultivation program, fish production could increase significantly. Prawns also have good market demand, which would boost the income and financial stability of fishermen. The Fisheries Department should take this issue seriously and implement a dedicated prawn cultivation project,” said Kantilal Nagare, a fisherman from Palsadev.