The biological system in these lakes cannot support a sustainable population of this type of animal.
How to Calculate the Potential Loch Ness Population
https://hubpages.com/education/How-to-calculate-Loch-Ness-population-based-on-predator-to-prey-ratios
50 alligators spotted in Florida pond
http://6abc.com/news/-50-alligators-spotted-in-florida-pond/1533454/