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War on Invasive Species Continues in Japan
Local residents in many areas of Japan are attempting to eradicate aquatic invasive species by means of “kaibori,” a traditional agricultural practice of draining ponds.

Japanese farmers used to conduct kaibori during agricultural off-seasons to prevent irrigation ponds from being silted up by mud. In recent years, kaibori has often been used for the purpose of environmental conservation as it is considered a practical way to catch foreign species.

Kaibori was conducted at a pond in Inokashira Park, in Kichijoji, western Tokyo. Of some 20,000 creatures that were captured through kaibori, two-thirds of them were foreign species such as black bass and bluegill. There was even a grass carp and 230 illegally dumped items – such as bicyles and home electronics.

 
 


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Herbicide Resistant Milfoil in Silver Lake - Silver Lake was so choked with aquatic weeds last summer that it was difficult to enjoy boating, swimming and fishing. The thick canopy of vegetation floating on the surface water turns out to be a mix of 20 different plant species, but not surprisingly, Eurasian watermilfoil, an aquatic invasive species, accounts for 60 percent of the growth.


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