I'm with Madfish, torturing animals for fun doesn't do it for me. We had a problem some years ago in the UK when Zander were introduced into a number of lakes locally as 'sport' fish without taking into account of their highly predatory nature. After wiping out the fish stocks in several places a cull was put into place and now there's very few if any left in UK waterways. A cull however, is one thing and I'm afraid this is something else entirely.
Just my 2 cents.
Jabo