Method for collecting and cultivating Platymonas

The invention discloses a method for collecting and cultivating Platymonas. The Platymonas is rich in protein, serves as high quality plant bait of a larva earlier stage of a marine food product, is high in nutrition and free of side effects and can improve larva immunity and disease resistance after the feeding. The method comprises the concrete steps of preparing vegetative growth collecting liquid, selecting an intertidal zone that is provided with low lying water storage low lying land and is suitable for Platymonas growth, spraying the vegetative growth collecting liquid, collecting the Platymonas, collecting algae-containing seawater in the water storage low lying land, adding the vegetative growth collecting liquid to the algae-containing seawater to cultivate the Platymonas, absorbing and putting the Platymonas floating on the upper layer into seawater containing nutrient solution to cultivate the Platymonas, and using the seawater containing the Platymonas to feed the larva of the marine food product directly. According to the nutrient substance tropism exists in the Platymonas, the vegetative growth collecting liquid is utilized, the Platymonas scattered in the water storage low lying land of the intertidal zone is gathered, the Platymonas is cultivated for a short time after the Platymonas is collected to serve as the nutrition source of the larva of the marine food product, and the Platymonas is the high quality plant bait for the earlier stage of the larva of the marine food product.