Daily Invader

Chesapeake Bay Anemones 

Striped Sea Anemone (Diadumene lineate)


Striped Sea Anemone (Diadumene lineate) was first reported in Cape Charles VA in 1929. 

The Striped Sea Anemone is native to Japan but has been introduced to many parts of the world including Chesapeake Bay. This beautiful anemone is highly variable in size, color, temperature adaptation, feeding cues, and mode of reproduction, which may have contributed to its ability to rapidly colonized new areas. It grows on many surfaces like docks, oyster reefs, marsh grasses, and the bottom of boats. It was likely transported to the Chesapeake Bay on the bottom of a boat in the late 1920s. It has since spread throughout the southern bay where it is now a common resident of the fouling community. While it is common, it has not been known to dominate the fouling community or cause any significant economic impacts. Complete record 


Starlet Sea Anemone (Nematostella vectensis)


Starlet Sea Anemones (Nematostella vectensis) are the lab rats of the sea.






Starlet Sea Anemones are very small estuarine mud-dwellers that look like a little sac with long tentacles. As their name suggests, they can be brightly colored but most of the time they appear transparent with light pink or peach guts. They were first described from the Isle of Wight, England but were probably introduction to England from North America, possibly with oyster imports. They are found in many estuaries on both the east and west coast of North America from Nova Scotia to Louisiana and Washington to California. Their native region is uncertain, but a recent genetics study concluded that they are native to the East Coast of the US and introduced to the US West coast and England. However, their late East Coast discovery, at Woods Hole, Massachusetts, a center for marine biology research, is puzzling. Possibly, it was native further south, and not discovered until it was transferred north with oysters. We consider it to be cryptogenic, north of Cape Hatteras, meaning its status is unknown. In Chesapeake Bay the first record was in 1963 in the Potomac River and no additional records occurred until 1987 when it was seen in a well studied section of the Rhode River. It hasn’t been seen in the Rhode River since 1988. This anemone is now a widely used experimental animal for studies of genetics and developmental biology, because of its hardiness and simplicity. Complete Record


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