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These black rockfish carry a tiny, harmless tag in their bellies that sends out a unique sound signal every so often. Receivers placed on the ocean floor pick up these signals whenever a tagged rockfish is near. That way, Jeff and Paul can tell whether the rockfish are moving around or if they just stay put.
Black rockfish used to live in West Vancouver, but they were fished out. The tagged rockfish were brought from the west coast of Vancouver Island to West Vancouver to build a new population there.
The tags let Paul and Jeff know that the rockfish are still around even if they’re living in deeper waters now and can’t be seen. So far, it looks like the immigrants are sticking around their new home.
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