Scientists have found lately that close to 90% of Sea creatures can produce their own light. This is a deep sea bioluminescent fish called the Midshipman Fish, so called for it's light buttons that look like the buttons on Midshipman's coat. They were among the first known of the Bioluminescent fish. They are kind of like the engineers of the sea.
Tracy Jacobs Midshipman Fish Cast Polyurethane plastic, light, electronics 4'x1'x1", 2015