Evaluation of different settlement substrates for field-based collection of Ostrea edulis. Spatial variation in oyster spat settlement along the Swedish west coast was also monitored.

Aim: Evaluate different types of settlement substrates for field-based collection of <em>Ostrea edulis</em>. Document spatial variation in settlement of oyster spat on coupelle collectors along the Swedish west coast. Different types of substrates (shells of different species and materials with different structures) were placed in the sea and the survival and number of spat attached to the substrates were evaluated. Growth and species identification (<em>O. edulis</em> versus <em>M. gigas</em>) were documented. Data was collected from the Swedish west coast in 2020.