Unfortunately at some stage you will need a specific lens for each application.
If you don't like to do too much PP then the first method I described sould work fine still it does require an external flash.
I don't know which 18-200 lens you mention for Canon as I was not aware that there is one for Canon. I do have the 18-200VR from Nikon and even though VR is great and helps a lot with handheld shots you will still need a faster lens to freeze fish motion especially if you will not be using a flash.
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