I love foreign films. No, this is not a hijack. There is a Korean film that is just wonderful, "Spring, Summer, Fall, Winter . . . And Spring". You don't have to know how to speak Korean, or read subtitles, because there is very little dialogue in this flick. One of the lessons to be learned by the main character is demonstrated by him putting a leash on a fish. YES! He ties a string around a fish, and ties the end to a rock. Now the poor fish is tethered. He feels guilty and returns to the pond, but the fish is already dead. His punishment (by his Buddhist Monk teacher) is to tether a large rock to himself with a rope. He wears this for some time.
Interesting movie. I watched it over 2 years ago, and still think about it occasionally.
Anyway, please don't put leashes on your fishes.
Here is a link to the movie trailer, which shows the leash on the fish. You have to get past a "Platoon" movie advertisement first.
http://www.imdb.com/video/screenplay/vi2441412889/