We left the Sultanahment area (Blue Mosque area), walked through alot of interesting little neighborhoods to Sokollu Mehmet Pasa Camii and then continued through more neighborhoods to the coast road along the Sea of Marmara and the Kumkapi Fish Market, which backs on the sea. This is the wholesale market where fishing boats bring in their catch each morning. There were so many stalls of very unusual and very fresh(!) fish. There were also stands selling freshly cooked fish sandwiches and a few sit down restaurants as well. If you arrive in time for lunch, grab a sandwich. If you arrive in time for dinner, head across the street.
Across the coast road is the Kumkapi quarter which is famous for its seafood restaurants. At night the street becomes a pedestrian zone and the area becomes very lively. 50+ restaurants line both sides of the street and owners & waiters will be vying for your business as you walk by. Don't be pressured, stop and look at some menus before taking a seat outside and enjoying dinner. Be sure to ask prices, if there aren't any on the menu!
The walk along the sea is nice and this area is a nice place to take a break and enjoy some fish!
Balik Pazari or Fish Market is excellent market for seafood at a cheap price. They are many stalls selling mussels on a stick and stuffed mussels, try it believe me it’s delicious. Fantastic place for a quick snack type of food. Not only the market sells fresh fish but you will also find stalls selling vegetables, fruits, herbs, spices and fabric material such as silk. Souvenir shops can also be found. We bought Turkish Pipe here at the fish market.
The fish market is a very busy place and the street or alley is covered. They are many small restaurants/cafe that the local have their lunch.
This fish market is located in Karakoy, right beside the Galata Bridge and where local ferries cross the Golden Horn.
I believe this is just off the Galata Bridge. You can find fresh fish here, just brought in by the fisherman, and if you have the means, cook it yourself.