Adrian Conan Doyle, the son of the famous creator of Sherlock Holmes, wrote in his book “Heaven has Claws” about a lagoon in Zanzibar where the bioluminiscense was so intense that he managed to read a newspaper from his boat deck at night, so bright was the glow coming from the water !
Similarly, he tells the tale of another haunting experience involving sea phosphorescense, which you can read in these excerpts from the same 1952 book:
“Silently, we stood and watched. It was apparent that this great patch of light, burning with a weird electric blue color, was well below the surface of the sea, and as it moved nearer the whole ship beneath the waterline commenced to glow with the radiance of its approach. It was passing directly under the keel when, seizing a lead sinker from the deck, I hurled it into the depth. In an instant the whole mass disintegrated into tongues of blue flame streaking away like meteors through the blackness of the water. It’s a school of big fish… Over there, cried Anna, there too! Oh, what a marvelous sight!
From all directions slow-moving masses of submarine light had begun to drift about the lagoon, glimmering palely at a distance of some hundred yards and gradually warming into wonderful shades of blue and green as they moved nearer to the ship. By watching very closely it was possible to discern that some of these mobile patches of light were caused by great sharks while others were whole schouols of middle-sized fish.
Straight past the ship they swept, their diamond-shaped forms lit up in a livid radiance, their great flukes thirty feet or more from tip to tip and so on into the darkness, streaming with heatless fire like ghost coaches gliding upon their way. Thus passed the Mantas.”