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Wildman beat me to some comments. Over water in the middle of the day can add air turbulence ans well that could play into the mix even on a cool day. Water is evaporating constantly and effecting the image close to the water surface.
The old film shooters rule of thumb is "shutter speed needs to equal the focal length". Since this camera has no SR, you need to be shooting at 1/250th or higher when hand held. Use a tripod and a higher shutter speed to cure most of the issue (the most important tool a wildlife pro has with him is a solid tripod).
Stopping down has been commented on and is correct. The lens should be between f8 to f11 for best results.
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