Keeping ammonia formalin tablets inside the gills keeps the fish fresh for 4 to 5 days. The tablet melts and the chemical leaches into the body of the fish and that's what prevents decay. But regular consumption of such formalin-laced fish can cause kidney damage.

This amounts… pic.twitter.com/lMW9XoKCIK

— Rakesh Krishnan Simha (@ByRakeshSimha) August 12, 2024