Washington SeaGrant Green Crab Team

If we haven't had the opportunity to talk about my research interests, you may not know that I have a particular affinity for invasion ecology. (Fun fact: so does Rebecca, who will be starting work on her PhD in invasion ecology at Oregon State University this fall! CONGRATS SMARTY PANTS!)

Last month, Rebecca and I attended a mini seminar here at the Marine Science Center on a new citizen science project, which studies the invasive European green crab (Carcinus maenas).

Washington SeaGrant (WSG) coordinates the "Crab Team", a volunteer-based early detection and monitoring program to improve our understanding of native salt-marsh and pocket-estuary organisms, and how they could be affected by green crabs. 

Tomorrow, Friday, March 18, 9 am - 3 pm, WSG will be at the Northwest Maritime Center for a volunteer training workshop. If you want to join the Crab Team register for the FREE training. If you are simply interested in learning more information about the project, visit the Crab Team website to learn some facts about the green crab.

We hope to see you tomorrow at the Northwest Maritime Center for the training.

—

ZOFIA KNOREK is the Citizen Science Educator and an AmeriCorps Member at the Port Townsend Marine Science Center

Mega-what?

Washington Department of Fish and Wildlife has teamed up with the Port Townsend Marine Science Center to monitor crab megalops during the summer again this year. Most of Puget Sound has a healthy population of Dungeness crab, but some places like Hood Canal and the Tacoma Narrows have shown a decline in their population. So what are crab megalops and how do we find them?

Megalops are one of the stages of growth in a crab. They go through a few different stages of growth before turning into a mature crab. We are able to find these tiny megalops (about the size of rice grains) by deploying mesh bags with an anchor that hang from local docks. The megalops that are floating around in the water column will get stuck in the sampler that we collect and count each week.

This research will hopefully provide more information about crab populations in the Puget Sound.

Growth stages of a crab

http://www.panagadivers.com/Diving/Z_kap_crab.JPG

2010 Abundance of crab megalops at various sample sites 

Crab Zoea, the growth stage before megalops

A week ago at the Port Townsend Marine Science Center there were thousands of crab zoea in the water, check out the video below to see how they move! You can find crab zoea on Fort Worden beaches right now, they are the tiny poky guys that you might be feeling when walking on the beach. Take a closer look next time you are visiting.

Crab zoea in a plankton sample

Valerie Lindborg

PTMSC Lab Coordinator