One of the oldest markets in south Kolkata, located in Mudiali, this entire complex was a residential area, which is now an old, decrepit building. Breathe in the smell of fresh vegetables the moment you step in, and then gradually move to the section where the fishes are being sold. During season, almost all the fish sellers stock Ilish, so you might want to explore a few shops first and then go for your buy.
Address: 184, Shyama Prasad Mukherjee Road, Sahanagar