If no fish are present it will go to the cyst stage if there is still fish it transforms into another stage in which it becomes an amoebae. They shed the flagella, lose some of the toxicity, stop photosynthesizing, and become more animal-like. No where is a fish immune to the toxin. Dinos life cycle is amazing it consists of 15 stages one as an amoebae that can grow to be 20 times the size of the original. Ironically the only time they can reproduce is during a feeding frenzy.
Autotrophs are a lot less deadly, and complex as their brothers.
Bioluminescence is light produced from a living organism produced by a chemical reaction. The two chemicals involved in this are luciferin which produces the light, and luciferate which acts as the catalyzer of the reaction. Dinos used in experiments are the Pyrocystsis lunula , fusiformis and noctiluca . The noctiluca is a little easier to deal with because of it's large size 2 mm diameter. The bioluminescence chemical structure that is produced closely resembles the structure of chlorophyll and many feel it derived from this.