Botrylloides violaceus

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Chain tunicate:
Chain tunicate (Botrylloides violaceus): This invasive species is fairly common as a fouling organism on boat hulls, on mooring structures, and under docks. Any sighting in a remote setting, or further than half a mile from harbors, floathouses, and docks, should be reported as soon as convenient to the Alaska Department of Fish and Game, 1-877-INVASIV.

This species can be identified thanks to the organization of its zooids into rows. each individual has one incurrent siphon, and those tend to be organized in parallel rows or elongated ovals.

The colonies start flat, and eventually acquire lobes. The color varies from almost black to bright yellow. orange is the most common color. Colonies are a few square feet in area, and grow easily on everything from PVC to steel and ropes. Marine vomit (Didemnum vexillum), in contrast, generally does not appear to thrive on PVC or steel in our region.

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