Dolphin carcasses are seen after being displayed by conservationists and environmental police officers at San Jose beach, 40kms north of Chiclayo April 6, 2012. The cause of death of over 800 dolphins in the last four months on the shores of Piura and Lambayeque is still being researched, Gabriel Quijandria, Deputy Environment Minister said on April 20, 2012. [Photo/Agencies]

Dolphin carcasses are displayed by conservationists and environmental police officers at San Jose beach, 40kms north of Chiclayo April 6, 2012. [Photo/Agencies]