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ผู้เขียน หัวข้อ: United States; North Carolina—Marine Crabs Harvested from Freshwater Ponds  (อ่าน 2225 ครั้ง)
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« เมื่อ: พฤศจิกายน 02, 2008, 09:59:24 AM »

United States; North Carolina—Marine Crabs Harvested from Freshwater Ponds

 
Researchers at North Carolina State University have harvested marine crabs from freshwater ponds.  They say the pond-raised blue crabs look and taste just like those harvested from the ocean.
 
Dr. Dave Eggleston, director of North Carolina State’s Center for Marine Sciences and Technology said: “We started out by catching small crabs in the wild and stocking them into farm ponds loaded with bass and bluegill predators, and we were still able to get 12 percent survivals.  So we teamed up with the University of Maryland’s Center of Marine Biotechnology, which had the expertise to grow hatchery-reared blue crabs, and stocked them in freshwater ponds at North Carolina State’s Vernon James Research and Extension Center in Plymouth—where the crabs exhibited some of the highest growth rates on record.”
 
Eggleston and his fellow researchers discovered that crabs could tolerate salinity levels of only 0.3 parts per thousand, which is about the same level found in coastal tap water.  They have already done work on population densities, feeds and habitats.  In July 2008, Eggleston and Ray Harris, North Carolina State Director of cooperative extension for Carteret County, stocked a 10-acre lake with 40,000 hatchery-raised crabs, and a smaller pond with 4,000 crabs.  The crabs will take approximately 105 days to reach maturity, and so far the endeavor looks successful.
 
Eggleston thinks a farm could produce two to three crops a year.  “If you look at a 2.5-acre pond, you could stock it with 50,000 hatchery-raised juveniles and expect to harvest around 20 percent, or 10,000 fully grown crabs.  At $3 per crab, that’s $30,000—and multiply that times three.  It definitely adds up.”  Eggleston pointed out that crabs don’t do well in freshwater during the winter months.
 
Source: The FishSite.  Scientists Harvest Blue Crabs in Freshwater Ponds.  October 1, 2008.
 
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