KITA-KYUSHU--Ryuhei Tanaka’s eyes lit up at the sight of a fancy colored carp swimming elegantly behind a show window on a street. Tanaka, who was around 10 years old at the time, soon made up ...

The main reason for the increase of weeds is the carp released in 2013 that were eating ... but swimmers don't like to swim among weeds." But Green said the weeds can be helpful for fishermen ...