i too have a Fuji S5700. See my flickr acount (signature) for some fish pics. They come out well so i can only imagine the S200HD will be better If you are getting blurry pics though i would reccomend a tripod because you will only get the same results no matter how good the camera is - unless you can set a faster shutter speed.
It isnt all about the camera, you first need to know how to use one.