Planktonic diatoms produce resting stages that survive in the sediment and allow species persistence over periods in which vegetative growth does not occur. Sediments from coastal estuary in the Mokpo Harbour, Korea were took and investigated. Diatom germination tests from sediment were carried out in laboratory. Diatom cells were identified by microscope based on standard method. This study provided more understanding of diatom germination from in situ sediment, seasonal condition as nutrient, light, moonson might also affect and decide significantly phytoplankton growth and bloom in coast. The study is very useful for investigation about plankton dynamic, food chain in coastal areas in general. | Germination test for diatoms from coastal estuary sediment