It is very distressing seeing birds caught in this way, and even worse when it is illegal.
I know that illegal trapping has bee monitoried on Chongming Island in the past. It may be worthwhile speaking to the researchers involved in that case about what action, if any was taken.
Could I suggest you continue to document the case by:
1. listing the numbers and species of birds caught,
2. the number and, if possible, the length of nets used,
3. the price that birds are being sold for
4. The number of people involved in the trapping
5. Any enforcement action that is taken
It is also helpful to try to find out the specific law under which activity these actions are illegal and quote them when corresponding with the appropriate enforcement authority.
Cheers
Mike K
