Measure Oysters Calendar Schedule	May: Thursday Evening and Friday Afternoon Class: Maintaining Shellfish Nursery Systems. Shellfish nurseries cross between being technically advanced and extremely simple. Learn about Upwellers and Downwellers, Flupsies and Seston Flux. The phase in aquaculture where nature and humans come together to maximize shellfish seed culture. Scallops have different requirements in the nursery as compared to other shellfish species. They like space (surface area) and they stick to everything. Find out how to maximize these requirements.