Japan introduced black bass in 1925 to improve sport fishing, but scientists now say the invasive predators transformed Lake Biwa and drove native fish into decline

For almost a hundred years now, the tranquil lakes of Japan have been reflecting an under-the-surface drama involving biology at its best. The effort was intended to boost regional tourism through a new recreational fishery. Back in the early twentieth century, some enthusiastic people saw an opportunity in bringing an exciting North American game fish to Japan.

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