The monitors know how to eat them, but if your nervous, behead them and the gills will not harm them then, but fins might! V. salvator has been report not able to feed on live fish underwater, where-as V. niloticus corals them in lakes/rivers and feeds on them underwater. V. mertensi also coral fish and Steve Irwin has seen that. V. griseus do not hunt fish persay, but do juvenile hedgehogs, and swallow them whole (juveniles do not have envenomated spines until a few months old) in and around water systems! I believe Dr. Wulf Haacke, curator of Reptiles of the African Transvaal Museum (Retired), RSA is doing a paper on this very thing of Varanus and fish foraging/diet...
cheers,
markb
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