Fishing is a popular hobby in Hanoi, especially around West Lake. Lots of people sit by the lakeside try to fish with their bamboo fishing rods.
The most common fish caught is anabas in these lakes. I have sat watching them a few times and I couldn't believe how many fish they actually catch. I'm not sure that I would eat these fish as the lakes in Hanoi are quite polluted but lots of people do. Anyway, this is a relaxing thing to do on the weekend to release stress or simply pass the time.