I was reading through a couple of the blogs I track each at day work and came across this robotic fish project some MIT students created. I can't wait till they make a trout version and figure out a way to hook a line to the bait and then we can just keep it swimming in all different directions :+

Just had to share - look at their prototypes I wonder if they got there hands on a couple of jointed baits before making these?

http://deals.venturebeat.com/2009/08/24/mit-researchers-create-robotic-fish-for-underwater-exploration/