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Aliens in the Palace!(invasive fish species threat to native Japanese fish)
Tokyo's imperial palace has always been the crowning symbol of all things Japanese. But these days the 13 moats that surround the palace are an exception. In the past few years alien fish--bluegills and black bass imported from the United States-- have invaded eight of the moats, eaten up the native fish and destroyed the ecological order. Last year the Japanese government took decisive action against the invaders, allocating [yen]50 million ($450,000) over five years to exterminate them and return the moats to their original state. Their solution: once a month, veteran fishermen are hired to cast their nets in the moats.
As go the palace moats so goes the country: black bass and bluegills have invaded most ponds and lakes on this island nation. Aside from being big and ugly, the fish are wreaking considerable havoc on local ecosystems. They eat the babies of many native Japanese fish, threatening the survival of several species, such as tanago and honmoroko. Earlier this year the Japanese government declared war on the invaders. It formed a panel of experts to analyze the situation and come up with strategies to eliminate the fish. So far little's been done, and the aliens continue to win the war of attrition.
Japan's woes began in 1925 when Tetsuma Akahoshi, a businessman with a fondness for game fishing, brought over 90 black bass from California. Bluegills were reportedly a gift to the crown prince (now the emperor) by the mayor of Chicago in 1960. Nobody knows how the fish wound up in the palace moats, but their spread throughout Japan probably had something to do with the rise of game fishing in the 1970s. Unlike many native species, black bass and bluegills go for lures, which makes them a favorite of the fishing-tackle industry. Millions of Japanese were persuaded to drop their lures into the country's hundreds of lakes and ponds. Rather than taking home their catch and eating it, they tended to throw the fish back in the water. The aliens returned the favor by devouring baby ...
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Source: HighBeam Research, Aliens in the Palace!(invasive fish species threat to native Japanese...