Invasive SpeciesSea potato

Colpomenia peregrina
FOUND by britsseapotato
Cape Elizabeth
ID Confirmed
Quality checked by Sr
Peer reviewed by Sr
Field Notes
An investigation into the amount of Sea Potatoes washed up on the beach was conducted on June 10. The data was being collected in connection to a Vital Signs study of the Sea Potato and whether it is invasive or not. We are hoping to determine the extent of their growth in Maine, and whether or not they are harmful to other species native to the area.
Supporting Evidence
Photo of my evidence.
Sea Potatoes are a species of globular, yellowish-brown seaweed that grows attached to other native species. Unlike the similar Sea Cauliflower, they are dull in coloration, as shown in the image.
Photo of my evidence.
The specimens showed size variation of about 6cm, and were all within the reasonable range of 1-7cm that is standard for Sea Potatoes. This variation in size, however, likely indicates that they are reproducing here, which increases the chance of them harming other species greatly.
Photo of my evidence.
The specimens all had thin outer walls, and a hollow interior, as seen in some of the photos. This further differentiates them from the Sea Cauliflower, which has far thicker outer walls.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Colpomenia peregrina
Common name:
Sea potato
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.561832 °
W -70.219244 °
Observation Site Information
A photo of our study site.
Coastal - Beach or dune
Trip Information
Kettle Cove
Trip date: 
Sat, 2017-06-10 09:32
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Time of low tide: 
Sat, 2017-06-10 06:34


I agree, that's a lot of specimens. Can you estimate the area you searched while looking around? Were these seaweeds attached to other seaweed species or washed up on the beach?

Wow! That is a lot of potatoes! Were these spread out along the beach or all clumped?