College of Marine Sciences;
Shanghai Ocean University;
Shanghai 201306;
Yellow Sea Fisheries Research Institute;
Chinese Academy of Fishery Sciences;
Qingdao 266071;
School of Chemistry and Pharmaceutical Sciences;
Qingdao Agriculture University;
Qingdao 266109;
Loop-mediated isothermal amplification; DNA extraction-free; Direct gene detection; Viable cell; Extracellular DNA;