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These weights are towed apart from each other from behind a boat, keeping fishing nets open. When hoisted back on board, the net closes and can be hauled in.
Fishing net trap door
The grab sampler will collect sediment samples once the spring releases the jaws at the bottom of the Patuxent River.
Sediment grab sampler
Oysters are placed in cages which are suspended by buoys and anchored with bricks.
Cages for oyster biological indicators
Excess fine grained oxic and anoxic sediments from a sample core taken from the Patuxent River
Fine sediments from Patuxent River
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
Measuring Secchi depth in frozen water presents a challenge.
Secchi disc on ice
A sediment core has been collected and is being prepared for storage and analysis by carefully filling the core with water from the sample site to minimize disturbance.
Sediment core preparation
Water samples from the Patuxent River are collected and prepared for analysis on board the R/V Aquarius
Water sample analysis
Plankton net tows behind a ship, collecting samples in the jar at the end of the net.
Plankton net
A view of a frozen Choptank River from the dock at Horn Point Laboratory, in Cambridge, Maryland.
Frozen Choptank River
The Horn Point Laboratory dock, on Maryland's Eastern Shore, juts out into a frozen Choptank River.
Winter at the Horn Point dock
buoys marking oyster biological indicators at a tributary of Monie Bay, National Estuarine Research Reserve at low tide along the salt marsh
buoys at low tide
Deploying oyster biological indicators of nitrogen source overboard in Monie Bay, National Estuarine Research Reserve System
Deploying oyster bioindicators
Measuring Secchi depth in winter presents a challenge.
Winter Secchi depth = 0
Tim Carruthers prepares a sediment corer with a rubber stopper. This corer is made by cutting off the top of a 60 mL syringe. Samples were collected from Maryland's Coastal Bays
Collecting sediment cores
A YSI meter is used to measure temperature, salinity, dissolved oxygen, and conductivity in Monie Bay, a component of Chesapeake Bay National Estuarine Research Reserve
Measuring water quality
Measuring Secchi depth in frozen water presents a challenge.
Winter Secchi depth
After being deployed as a biological indicator of nitrogen source, the gills of this oyster were dissected and dried and will be ground for isotope analysis.
Dried oyster gills
Deploying oyster (Crassostrea virginica) biological indicators of nitrogen source in Monie Bay National Estuarine Research Reserve System
Deploying oyster biological indicators
Collecting oyster biological indicators after deployment in Maryland's Coastal Bays.
Collecting oyster biological indicators
A sediment slurry was mixed and the flask capped to trap gases formed as intermediary steps of denitrification.
Sediment slurry
buoys marking oyster biological indicators of nitrogen source in Little Monie Creek, Monie Bay, National Estuarine Research Reserve System.
buoys in Little Monie Creek
Bags holding oysters hang off the Horn Point Laboratory dock under a layer of ice in the Choptank River
Oyster bags under a frozen river
Water quality monitoring fieldwork in Maryland's Coastal Bays
Fieldwork in Maryland's Coastal Bays
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2020 Horns Point Rd
Cambridge, MD 21613

410-221-2048

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