As part of ongoing efforts to safeguard critical eelgrass meadows and Pacific herring spawning grounds, Friends of the San Juans (Friends) recently spearheaded the removal of two derelict structures from local bays.
Herring in eelgrass Image by Florian Graner.
Former sections of docks and floats located in Judd Cove on Orcas Island and Blind Bay on Shaw Island were abandoned, posed navigational hazards, and threatened the marine ecosystem. The structures were identified by the Washington Department of Natural Resources as “marine debris” prior to their removal.
Chemicals and plastics frequently found in derelict docks, floats, and other structures are toxic to aquatic life and can linger in the water and sediment for a long time. In addition, direct structures shade out marine vegetation such as eelgrass.
A crane and barge remove derelict floats from Blind Bay on Shaw Island (below- structure when it had washed ashore onto surf smelt spawning habitat)
Removing unnecessary structures for beaches and nearshore habitats is one of Friends' ongoing efforts to enhance eelgrass habitats, which are vital for Pacific herring spawning and the overall health of the marine food web. Eelgrass, a flowering plant that thrives in shallow marine waters, supports a diverse range of marine life, including Dungeness crabs, outmigrating juvenile salmon, and, most importantly, Pacific herring.
A derelict concrete structure located offshore of the San Juan Conservation Land Bank’s Judd Cove Preserve on Orcas Island. North Eastsound is one of five remaining herring spawning areas here in the San Juans Islands.
The northern end of East Sound on Orcas Island and Blind Bay on Shaw Island are two of just five remaining herring spawning areas on just five remaining herring spawning areas in the San Juans Islands. Out-migrating juvenile salmon from across the Salish Sea rely on shorelines in the San Juan Islands as important habitat as they head to the Pacific Ocean and herring are a critical component of the diets of these young salmon.
Local contractor A1 Marine e removes a derelict concrete structure from Judd Cove Preserve on Orcas Island.
Derelict floats in Blind Bay on Shaw Island, washed ashore onto surf smelt spawning habitat.
This past summer
Friends also embarked on a comprehensive eelgrass research and mapping project to inform restoration and protection actions that include derelict structure removal, mooring buoy upgrades, Anchor Out of Eelgrass boater education, and full-scale shoreline habitat restoration projects. These efforts, funded by the U.S. Fish and Wildlife Service, the WA Seattle Salmon Recovery Funding Board, and generous member donations, are crucial to safeguarding our shorelines and ensuring the survival of endangered or critically declining plants and animals.
· Eelgrass and herring spawning area protection maps for boaters: sanjuans.org/greenboating
· Eelgrass research: sanjuans.org/eelgrass