Narrator: This is Science Today. Ongoing studies by University of California marine biologists are finding that invasive marine animals, such as the European green crab, when introduced to the U.S. environment, are growing to almost twice their original, native size. Ted Grosholz, an environmental scientist at the University of California, Davis, says the reasons for this growth vary.
Grosholz: Often in these marine and estuarine systems, they're fairly open - meaning that if it's a new species coming into a new niche or a new habitat, without a native species there, they maybe able to make use of resources and grow up faster, bigger and larger.
Narrator: Grosholz suggests the development of a national management plan to curtail potential species invasions further away from their initial establishment point.
Grosholz: We would like to see no more sales of live bait for instance, or certainly live fish. The state of California still allowed the sales of mosquito fish for controlling mosquitoes and mosquito fish have out-competed species all over the place.
Narrator: For Science Today, I'm Larissa Branin.