udp report The content included in this site is from big data collection and the copyright belongs to the original website! 2 Shellfish spit sand is a seemingly simple behavior, but in fact, there is a complex biological mechanism hidden behind it, reflecting the unique way shellfish survives and adapts in the marine environment. We need to understand the specific meaning of shellfish spit sand. When people observe that shellfish expels sand or small particulate matter from the body, they are actually undergoing food filtration. Shellfish ingest food particles such as plankton, organic debris, and other food particles in the water into the body through their special filtering organs - tentacles and gills. These food particles are usually attached to water and suspended... 30 people