Hangzhou City is taking steps to improve the quality and safety of key aquatic species, in line with government regulations. The city has increased inspections and testing of these species, leading to the investigation and handling of six cases. Hangzhou has also implemented a system of personalized colloidal gold test cards for production entities and a waterproof 'one code and one certificate' system for aquatic products. A special rectification task force has been set up to address drug residue in key aquaculture varieties, and township supervisors and village-level coordinators are conducting regular inspections.