Every aquaponics practitioner shares the same fear: that one morning all the fish will be floating on the water’s surface. Although tilapia is one of the hardiest species raised in aquaculture, they still depend on well-managed water quality. Here are some lessons we have learned at the CLF Aquaponics Project.
Monitor Your Water Chemistry
Aquaponics is a living system that depends on a series of chemical and biological cycles and physical treatment of waste (i.e., filtration and sedimentation) to maintain healthy water. We regularly test for several parameters: pH (daily), ammonia, nitrite, nitrate, and alkalinity (weekly). With the help of bacteria, ammonia from the fish waste is converted into nitrite and then nitrate. Ammonia and nitrite are both highly toxic to fish, and we monitor these levels to ensure that they are Read More >
Today marks the 25th anniversary of the Chesapeake Bay restoration effort. In the two and half decades since the landmark Bay action agenda was agreed to, Maryland’s watershed clean up initiative has received mixed reviews on its success. As the Washington Post noted, “Despite a quarter-century of work, the bay’s biggest problem — pollution-driven “dead zones,” where fish and crabs can’t breathe — has not significantly improved.” Yet there are important environmental improvement initiatives on the way.
The Post’s editorial page yesterday hailed Maryland Governor Martin O’Malley’s efforts to protect the Chesapeake by limiting further development along the Maryland shoreline and enacting new measures limiting agriculture runoff from chicken farms, the leading source of harmful nitrogen and phosphorous found in the Bay.
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Water-based sewage disposal, first introduced into the United States around the turn of the 19th century, provided a more expedient, and seemingly more hygienic, system to dispose of human waste. But these systems lead to increases in water use for waste disposal and increased pollution to surface and groundwater.
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