Finally, a good idea from India that we should be adopting on the Rio Grande. And maybe the St. Lawrence if we could get crocs and snakes to withstand the cold.
Piranha fish will thrive in Rio Grande. More effective and more active than crocs who need to eat only once a month.
Snorkeling in Ice: Alligators can survive frozen water by creating holes in the ice, keeping only their snouts above the surface to breathe while their body remains submerged in slightly warmer water below.
https://abcnews.com/US/alligators-north-carolina-poke-nose-ice-survive-freezing/story?id=52233678