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Eager for a low-impact way to tally scallops in the highly productive fishing waters off Cape Cod, local scallop fishers teamed with scientists and engineers at the Woods Hole Oceanographic Institution to design an innovative underwater camera called HabCam. It acts as a satellite for the seafloor, trailing behind a fishing boat and snapping a continuous strip of pictures of the life at the ocean bottom. HabCam surveys are also revealing a potential threat to the scallop fishery: an invasive marine invertebrate that is colonizing the very ground the scallops rely on.