About one month before the metamorphosis of the sea urchin began, preparations for attachment of benthic diatoms and benthic diatoms were initiated. In a water tank with a water depth of about 60 cm and a good light condition (2000 lux), the frame is placed and the frame is covered with a plexiglass corrugated tile, the specification is 32410.1 (cm), placed 60 degrees from the bottom of the pool, and then collected near the tide Interspersed growth of seaweed, after scrubbing, collecting benthic diatom algae. After filtering with N103 sieve, spread it evenly in the pool, do not change the water within 24 hours after fertilization, change the water and fertilize every day, and check the growth of benthic diatoms. After a period of cultivation, the dominant species is mainly Navicula. Some species of the genus Rhynchophylla, and algae with grooving, etc. These algae species are strong in vigor and growth, and they are palatable baits for metamorphosis of late juvenile sea urchins.
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