Going into the source of the article (infobae.com, not the best source of information around here), the fish is a tarira, local name for the Hoplias malabaricus, a fish that likes warm, slow flow, shallow muddy waters and that can breathe oxygen from the air if it needs to. It's a nocturnal predator and eats nearly everything (according to the Spanish page of Wikipedia). Given that there is no recurrence of similar features in other organisms in the zone, the most likely explanation for the third eye is that it just happened. If there is recurrence, then we can start to speculate about contamination. Genetics is just a lottery.
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