it? probably not. although interestingly enough it s the same seaweed we would eat in miso soup. reporter: it put the state in foul water. fouls, fishing gear, pro poler, it s a fast growing intrusive species. reporter: the state raising a red flag on the weed worry is no surprise. we have already been working with environmental stakeholders and even reaching out to places like the smithsonian institution to figure out best practice. reporter: it s not like the vase going to create the problem. every day boats like these go out and spread it around more. every day tankers come into the bay, ships coming in carrying it. but the city wants to tear down and rebuild a number of aging piers along the waterfront that are likely infested with the invadin seaweed. that s like setting off a bomb. it likes to attach to a hard structure like a pier or boat hull and when you move it at the wrong time it releases thousands of spores which can go anywhere. i think it s goin