European green crabs have started expanding into Puget Sound here in Washington in recent years. Part of the problem is that some people--such as myself--would happily catch and eat them, but as an invasive species, they're illegal to catch/possess. I imagine our huge Asian population would also happily eat them. The fish and wildlife department really ought to carve out an exception so that we can all help slow their spread. They have the potential to destroy our native dungeness crab population (the green crabs eat the baby dungeness crabs), which is a huge commercial and recreational fishery.
The idea is to prevent people from spreading invasive species, but in this case, the law is backfiring because it's not people spreading the invasive species. It's already here and spreading on its own.
Hey, it's not like crab isn't a delicacy to western civilization, at least ever since trains in the US started serving lobster. Ever since we stopped thinking of them as "gross water crawlies" and started seeing them as valid gourmet food, crustaceans have become a boon to coastal communities. If these ones don't belong here, the real issue is keeping them alive. Simply make sale of live crabs illegal and require all crabs to be cooked the same day the invasive crabs are caught (donate the extra to the homeless).