*2.1. Crab Sampling*

Chinese mitten crabs were obtained from various farms situated in the Qingpu and Chongming districts of Shanghai (Table 1). Among the sampling sites, three were in the Qingpu district and three were in the Chongming district (Figure 1). A total of 90 crabs were collected, 15 at each sampling site, and each crab was the commercial standard size of about 100.2 ± 5.6 g. In addition, Chinese mitten crab samples sold in fresh markets around Shanghai were also procured for further testing and evaluation. A total of 555 crabs were collected, 15 at each sampling site, and each crab was about 101.6 ± 3.6 g. The sampling information for the market crabs is shown in Table S1 and Figure 1. After arriving at the lab, the samples were freeze-dried and stored in a refrigerator at −20 ◦C.

**Table 1.** Farm crab sampling site information.


**Figure 1.** Crab sampling sites in Shanghai.
