This week, scientists are scouring shoreline habitat near Westcott Bay on San Juan Island, hunting for green crabs. The Washington Sea Grant Crab Team, with help from the state Department of Fish and Wildlife, will set dozens of traps in an effort to learn more about the population of the invasive species. Last month, one was found there for the first time, confirming that European green crabs have entered Washington’s inland waters. The rapid response is part of an ongoing monitoring effort