Hi, Len, have a look in your camera's manual for the AF instructions.
The review says
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Focus: Sets focus control to Multi AF or Center AF, or one of five preset focus distances (0.5, 1.0, 3.0, and 7.0 meters, and Infinity).
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If you can work out how to set your camera to 1 or 3 metres focal length for your fishy shots - then stand 1 or 3 metres away when shooting - you should get better results.
At present I suspect you are shooting on auto-focus and the reflections of the water confuse the sensors, causing it to focus elsewhere than your intended subject. By 'fixing' the focal length you'll always get a crisp shot.
Just remember to return the camera to auto-focus for general use.