AR-News: (U.S.) twine keeps cormorants from fish
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Tue Jan 6 13:14:57 EST 2004
WATER TURKEYS FOILED BY TWINE
Agricultural Research, Science Update; Andrew A. Radomski, January 2004
Researchers have tested a low-tech solution to the problem of poaching by
double-crested cormorants, often called water turkeys. These migratory
diving birds winter in the Delta region, where they voraciously feed on
channel catfish fingerlings and any other fish they can swallow. Each one
eats up to a pound and a half a day.
Seeking an inexpensive, easily set up, environmentally benign way to
discourage this predation, researchers installed twine barriers across test
ponds. It took about 3 hours for a three-person team to string a 15-acre
pond, placing posts at 100-foot intervals, stretching the twine across the
width of the pond, and maintaining the string 3 feet above the water in the
middle of it.
Using four ponds at each of six privately owned catfish farms, only 2.3
cormorants per hour, on average, landed on ponds where the twine was used,
compared to 10.6 birds on unstrung ponds. Seeing fewer birds on twined ponds
apparently discouraged others from attempting to land.
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