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- Cream, white, tan, or yellow
- Dense colonies of microscopic, individual animals (zooids)
- Colonies grow up to 12-18 in (30-46 cm) long
- In slow-moving waters, may form long, ropey, or beard-like colonies that commonly hang from hard substrates such as docks, lines, and ship hulls
- In faster-moving waters, may form low, undulating mats that encrust and drape rocky seabeds (pebbles, cobbles, boulders, and rock outcrops)
- Hard surfaces such as docks, pilings, moorings, ship hulls, rocks, and seafloor
- Primarily below the low-tide line to continental shelf depths of 210 ft (65m)
Known Distribution in the Northeast
- Northeastern U.S. (New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine)
- Covers much of Georges Bank and Gulf of Maine
- Alters marine habitats and threatens to interfere with fishing, aquaculture, and other coastal and offshore activities
- Grows over organisms such as tunicates, sponges, seaweeds, hydroids, anemones, bryozoans, scallops, mussels, and oysters
- Covers siphons of shellfish living in the seabed
- Blocks bottom-feeding fish from reaching their prey