The algae is phosphorescent and lights up with a bluish light visible at night when the water is subjected to “unexpected” motion. Thus phosphorescent surf. This is not a real common occurrence, but is impressive. I understand that the actions of swimming also causes phosphorescence. Apparently makes your arms light up.I was too old to try this a few years ago near San Diego, but a younger friend came running across the beach, announcing, “I’m going in!”
One of God’s under appreciated wonders.
That just makes it easier for sharks to feed at night.
The phenomenon is indeed, fairly rare, and very beautiful at night. The light is more accurately called "bio-luminescence", and it is quite a sight. I remember nights, especially when there was no moon when the "red tide" was in bloom, we would stroll on the sand, and watch the waves explode as they rolled in. Just kicking the sand was like creating yellow-greenish explosions. It is one of my fondest romantic memories of Ventura California, sailing home from a trip to the islands, and making a path through the red tide. The water glowed brilliantly as we passed through, our wake glowing and exploding with the light.
Thanks for that memory...
Amazing! I wish I could see it!