Bebek, the beautiful neighborhood in which I live, is a five minute walk to the Bosphorus. It's about a 20 minute walk to the next neighborhood, Arnavutköy. The walk between Bebek and Arnavutköy travels right alongside the water and is absolutely beautiful.
In good weather, fishermen line up to see what they can catch. The fishing isn't actually that good - I've never seen anyone catch anything of notable size. It's pretty much a social activity.
As you stroll along the waterfront, you have to keep your eye out for lines waiting to be cast. Some people that I know don't enjoy walking past them because of the prevalence of hooks and lines but as a girl who spent her formative years standing in my friend's front yard while he practiced casting, it's not a big deal to me. Here and there you'll see large buckets of water holding small fish. I really don't know if these 5" fish are coming from or going to the Bosphorus, but they seem as happy as they could be swimming around in old yogurt containers.
I really want to go fishing but I need to learn more Turkish before I attempt to penetrate this sub-culture. Maybe next spring. I'll post pictures when I do.