Thank you to everyone, especially Alan Friswell, who solved my conundrum of yesterday. The mermaid, which was supposedly washed up off the coast of Mexico was a complex creation of artist Juan Cabanos, a man of whom I had never heard before. He writes:
I created this 5 foot long mermaid using a human skeleton and covering the entire corpse with real fish skin. The fins and teeth are also authentic and derived from fish. Unknown persons took my photos and used them to create stories of finding this mermaid in various locations around the world. A newsreporter in Mexico sent me the actual newspaper reports (shown below) of my mermaid being discovered off the coast of Campeche.
And the images appear to be nearly a decade old... Well done guys