Competitor moulds can cut oyster yield by up to 70 per cent, so prevention beats any cure. DMR asks for the spawning room to be disinfected two days before spawning and kept closed. Wash the draining floor; keep hands, buckets and knives clean.
The opening and drainage pattern belongs to the chosen bag method. It does not by itself guarantee substrate temperature; inspect drainage and measure conditions. Use the supplied product's batch-specific storage and use-by instructions; age alone does not establish quality. Keep flies out with fine net on doors and windows. Keep suspect bags closed and limit movement. Follow a competent containment and locally appropriate disposal procedure rather than dumping material in an outdoor pit.