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Didemnum vexillum
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THE CRIMES: This colonial tunicate competes for space, rapidly taking over new habitat and fouling both nearshore structures and immobile organisms. Forms extensive mats that overgrow the bottom, including sea scallop beds. Covers more than 100 square miles of prime fishing grounds 100 meters deep off the New England coast; also inhabits parts of Long Island Sound and other coastal areas. DESCRIPTION: Feels slightly squishy; colonies can be pink, whitish-tan, or orange-yellow. Shape varies from rope-like tendrils to flat mats. Each individual member of the colony is 1/14th of an inch long. Grows on docks, pilings, underwater rocks, and gravel; habitat type, water current speed, and the amount of space available may determine colony shape. Can grow in shallow water, but prefers deeper, colder water. Reproduces by larvae and also when pieces of the colony break off and are carried to a new location. The Interrogation
Where are you from?
Scientists may have finally figured out who I am (Didemnum
vexillum, if you MUST know), but they remain
confused as to whether I come originally from Europe,
Asia, or New Zealand. As for me, I intend to keep my
native habitat to myself. Let the experts figure it out.
How did you get here?
Colonial tunicates take advantage of several free “rides”. One of my favorites is attaching to boat or
ship hulls. Some of us came in ballast water, which as you know, has been “the ride” for many aquatic invaders over the years.
It’s also possible that humans accidentally moved us from one area to another in shipments of clams or oysters from other
countries.
Where’d you get your nickname?
Well, we can’t help it if our beautiful colonies covering the sea floor happen to smother
the silly worms, seaweeds, sea anemones, and shellfish that don’t get out of our way. So what if there’s less
food for fish feeding near the bottom or if some shellfish farmer loses his crop? Tough noogies! I’ve heard you humans
say we resemble pancake batter, soggy scrambled eggs, or even alien “vomit”! (Where’ve they seen THAT, I wonder?)
Like other tunicates, we’re also called “sea squirts”. Talk to
Stella if you want to know why.
Reward:
The honor of protecting our water resources— A healthier environment
and more opportunities to enjoy our natural areas.
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