by Colette Derworiz, Calgary Herald A ship enters a port with certain mollusks attached to its hull. A couple drop off and, in not so many years, they multiply and begin to spread. So what? We've got some strange creatures in our waters. What's the big deal about that? And, there is this: Read more @ http://www.calgaryherald.com/news/a...d+carry+high+costs+Alberta/9802615/story.html
