According to posts on the ALIENS-L listerserver today, Nile tilapia (Oreochromis niloticus, but the exact species is not yet officially confirmed) have been discovered in a lake on the Galapagos Islands. Hundreds of the freshwater fish were removed from the lake on the island of San Cristobal (perhaps El Junco?), indicating that the introduction was not recent. There are no native freshwater fish species native to the Galapagos, and as far I can tell, stocking of freshwater bodies with fish is not allowed there.
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