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A marine protected area is a zone designated as a no-fishing or limited fishing or harvest area. This is a resource management practice that may be used when the marine resources are at risk due to human and natural activities such as over-fishing, habitat destruction, invasive species, and/or climate change. — Marine protected area

buoys marking oyster biological indicators at Monie Creek, a tributary of Monie Bay, National Estuarine Research Reserve — Buoys in Monie Creek

Oyster biological indicators are deployed in mesh cages that will be suspended 0.5 meters above the bottom by the white buoys and anchored by the bricks. — Cages for deploying oyster biological indicators

Assembled gear to deploy oyster biological indicators. Cages will hold the oysters and will be suspended 0.5 meters above the bottom by the buoys and anchored by the bricks. — Cages for deploying oyster biological indicators

Oysters are placed in cages which are suspended by buoys and anchored with bricks. — Cages for oyster biological indicators

The oysters in this cage are being deployed as biological indicators of nitrogen source. They will be suspended 0.5 meters above the bottom by the white buoy. — Oyster biological indicators

This buoy is marking a deployment of oyster biological indicators in Monie Creek, part of the Chesapeake Bay, National Estuarine Research Reserve — Buoy marking oyster biological indicators

Collecting oyster biological indicators after deployment in Maryland's Coastal Bays. — Collecting oyster biological indicators

A few housing developments can be seen in upstream areas of Monie Creek. — Development along Monie Creek

buoys marking oyster biological indicators of nitrogen source in Little Monie Creek, Monie Bay, National Estuarine Research Reserve System. — buoys in Little Monie Creek

Oyster biological indicator cages have been collected after deployment. — Fieldwork in Maryland's Coastal Bays

Buoy marking oyster biological indicator in Little Monie Creek, Chesapeake Bay National Estuarine Research Reserve — Little Monie Creek

Cages for oyster biological indicators are messy with sediment and fouling after deployment — Messy cages

Guiding the boat to deploy oyster biological indicators near a salt marsh. — Small boat work

Aid to navigation on upper Hudson River, NY

Illustration of tsunami sensor and transmitting buoy — Tsunami sensor and transmitting buoy

Illustration of warning buoy — Warning buoy

Buoys like this mark the location of oyster bioindicators used to identify nitrogen source. The oysters, in a cage, are suspended off the bottom by the buoy, which is anchored by bricks. — Oyster bioindicator marker

Large buoys like these mark the boundaries of Oyster Sanctuaries for restoration of the native species in Chesapeake Bay. — Oyster sanctuary marker

Large buoys like these mark the boundaries of Oyster Sanctuaries for restoration of the native species in Chesapeake Bay. — Oyster sanctuary marker

Buoy: midchannel, safe

Buoy: port, lighted