Botryllus schlosseri

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Golden star tunicate:
Golden star tunicate (Botryllus schlosseri): 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 stars, or circles. each individual has one incurrent siphon, and those tend to be organized in circles.

The colonies are generally rather flat, with few lobes if any. The color varies from almost black to bright yellow. orange is the most common color. Colonies are generally not larger than a few square feet.

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