Light is inhibitory to zoospore formation but stimulatory to zoospore germination. The sorus forms directly from the zoospore nucleus. Zooxanthellae in the zoospore stage exhibit motility as forward movement or gyratory movement. Zooxanthellae is only motile if it originates as a zoospore. As opposed to the zoospore, the zooxanthella contains numerous chloroplasts. Some chytrids are monocentric, meaning a single zoospore gives rise to a single zoosporangium. Asexual reproduction by zoospore or by aplanospore. The morphology of the zoospore is similar to a "standard" stramenopile cell. The lifecycle of "Syndinium" is currently not well understood beyond the parasitic and zoospore stages. Within a few minutes, this zoospore will encyst, germinate and release another zoospore. Only one type of zoospore will emerge from any single host. Others are polycentric, meaning one zoospore gives rise to many zoosporangium connected by a rhizomycelium. In eukaryotes there are four main types of zoospore, illustrated in Fig. The initial classification of the pathogen as a chytrid was based on zoospore ultrastructure. Proper field drainage prevents flooding and therefore inhibit zoospore movement towards the host.