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<i>Crassostrea</i> is the most farmed oyster genus worldwide and has significant economic and social impacts with environmental benefits. Hatchery oyster seed production is a highly costly phase, and a fluidized nursery system can help reduce this cost and reduce seed production time. The present study evaluated the survival and growth of two oyster species (<i>Crassostrea gasar</i> and <i>Crassostrea gigas</i>) in a fluidized bed bottle nursery system. With <i>C. gasar</i>, two experiments were performed; one tested three stocking densities and the other three bialgae diets. With <i>C. gigas</i>, one experiment with a bialgae and monoalgae in an initial bottle occupation of 8.8% produced more seeds per bottle, but an initial bottle occupation of 2.2% produced bigger seeds. Also, the experiment with <i>C. gasar</i> and with <i>C. gigas</i> tested diets did not affect seed survival, but the diets with bialgae <i>I. galbana</i> and <i>N. oculate</i> promoted more seed growth. The fluidized bed bottle nursery system developed for this study was adequate for the seeds of the oysters <i>C. gasar</i> and <i>C. gigas</i> in the nursery phase.