Measurements of the number of larvae oyster and the water temperature in the Spuikom Ostend in 1964. Surface water samples (100L) were taken regularly and plankton samples were taken using a planktonnet to calculate the number of Ostrea larves. The measurements within this dataset were digitized by VLIZ from the publication: Polk, P. (1965). Observations sur l'éclosion de larves d'huîtres dans le bassin de chasse d'Ostende Council Meeting - International Council for the Exploration of the Sea, CM 1965(15) ICES: Copenhagen. 4 pp