Totally my current opinion and experince too. Not that I don't hope the one Cole's talking about to be a true perruno but, AFAIK, the chances are 1 in a trillion... not zero thoughThey are known from only one place: South America, Lake Maracaibo basin, from where there has not been any export for many decades... experts tell us.
sorry old photos cant get new ones as they are now in my pond, not sure if they are any good.
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Here is a better quality pic of my TSN. Maybe this will help you with an ID.