Wake up very early and make your way to the Pasir Panjang Wholesale Market. This market deals mainly in fish and vegetables and operates from as early as 1 am,  and so you will see a lot of retailers from the neighbourhood markets buying up their supply for their next day business. This wholesale market is nothing like the Tsukiji fish market in tokyo because there is no auctions and mammoth size tuna .. . only the usual bargainings and lots of ikan bilis.