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Oyster aquaculture could significantly improve Potomac River estuary water quality
Date:4/9/2014

Oyster aquaculture in the Potomac River estuary could result in significant improvements to water quality, according to a new NOAA and U.S. Geological Survey study published in the journal Aquatic Geochemistry.

All of the nitrogen currently polluting the Potomac River estuary could be removed if 40 percent of its river bed were used for shellfish cultivation, according to the joint study. The researchers determined that a combination of aquaculture and restored oyster reefs may provide even larger overall ecosystem benefits. Oysters, who feed by filtering, can clean an enormous volume of water of algae which can cause poor water quality.

The study is based on data modeling and an ecosystem-wide scientific evaluation, which examined how activities in the watershed affected the river estuary's water quality. The research team evaluated nitrogen flows from the Potomac River headwaters and the nutrient-related water quality conditions of the estuary, called eutrophication.

Eutrophication takes place when a body of water becomes enriched in dissolved nutrients that stimulate the growth of aquatic plants, causing nuisance algal blooms. These blooms often result in the depletion of dissolved oxygen and the loss of seagrasses.

The team sought to assess how shellfish aquaculture specifically oyster aquaculture -- could be used to remove nutrients directly from the water, complementing traditional land-based measures.

Although the estuary bottom area needed to grow oysters to remove the nutrients exists, it is unlikely that such a management measure would be implemented because of conflicting uses. However, a smaller area could still provide great benefits if aquaculture leases were approved. According to the study, if only 15 to 20 percent of the bottom was cultivated it could remove almost half of the incoming nutrients.

"Our study looked to see just how much impact oyster aquaculture could have in restoring
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Contact: Ben Sherman
Ben.Sherman@noaa.gov
301-713-3066
NOAA Headquarters
Source:Eurekalert

Page: 1 2 3

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