- industrial pollution
- agricultural runoff
- alien species introductions
- alterations of stream flows
The article Silent Streams from the April 2010 issue of National Geographic outlines the efforts of a group of biologists to preserve threatened species of marine life using a technique called captive propagation. Conservation Fisheries Inc. (CFI) identifies threatened species of freshwater marine life with the help of other interested organizations. Once the species are identified, CFI collects and then preserves as many fish as possible in large glass aquariums housed in Knoxville, Tennessee. Once a stream or creek is deemed clean enough, preserved fish are reintroduced in the hopes that they will now be able to thrive in a more hospitable habitat.
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