The pearl oyster is noted for producing the largest and most valuable colored pearls in the world. In French Polynesia, is the most important aquaculture species, far ahead of any other main food species. Indeed, the pearl culture industry plays a major economic role and represents the largest export industry in the region. Traditionally, culture has been based on spat collected from the wild, which are then on-grown to a suitable size prior to seeding for pearl production. However, in a number of Pacific countries, the abundance of adult pearl oysters is low and there is limited natural spatfall. Hatchery production has been considered as an important alternative to wild spat collection for pearling industries. However, high mortality rates during spatfall and a few days after settlement have been limiting factors. This study was conducted using larvae at different stages to observe their swimming behavior, swimming speed, natural sedimentation, and the filtering of microalgae under an optical microscope, so as to provide information for optimizing larval breeding facilities and feeding strategies. The results showed that the larvae swim and filter microalgae by beating their cilia. When functional, the double shells on the top of the larvae open with the umbo toward the bottom, and the velum projecting from back of the shell is used to propel the body when swimming. Larvae swim around clockwise in circles of a certain radius, and in the vertical direction the larvae swim in a spiral either rising or falling. The 1~25-day-old post-hatch (dph) larvae have a horizontal swimming speed ranging from 246.88 μm/s to 3641.94 μm/s, and the relationship between shell length ² +37.2690 P<0.05) positive correlation between the swimming speed and the surrounding radius. With an increase in body weight and degeneration of the velum, the velum can no longer be used for larval swimming, which causes an increase in the natural sedimentation rate, and at 13 dph the shell length of larvae settled on the bottom substrate was significantly (<0.05) larger than that when in suspension. Excessive ingestion of baits would lead to indigestion, with bait being directly excreted from the body without being fully digested and exploited.