Bioluminescence is the production and emission of light by a living organism. On dark (moonless) nights on Tomales Bay, bluish white flickers are visible in the water column, which come from blooms of bioluminescent “dinoflagellates”. These tiny critters emit short flashes of light when disturbed, and at certain times of the year put on quite a show for kayakers. Schools of fish in the bay create a phosphorescent trail which can look like a glowing cloud in the water. Seals chasing the fish may create a phosphorescent event which can be very exciting to watch. Night Herons are often out and about as well, chasing the same schools of fish. All this glowing activity is only visible at night when the sun and moon are both down. Accordingly, we have set up evening paddles which should afford good viewing after we enjoy the beautiful sunset.