Invasive Species 外国からきた魚 - The aquarium has a number of tanks showing invasive species like this Red-eared slider/terrapin (ミシシッピアカミミガメ).Invasive species, popular pet, outcompetes native turtles for physical space.
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Northern snakehead (カムルチー) - Invasive species, eats aquatic insects, mollusks, and carp.
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Red swamp crayfish (アメリカザリガニ) - Invasive species, destroys water plants, outcompetes others for food.
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Black bass (Largemouth bass) are the worst invasive species in Lake Biwa. (ブラックバス・オオクチバス)
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Largemouth bass (black bass) and bluegill are Lake Biwa's worst invasive species. They eat eggs and fry of native fish, crustaceans, and insects.
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Bluegill was brought to Japan in 1960 as a food fish by then Crown Prince Akihito who received it as a gift from Chicago, IL. In 1963, the Fisheries Agency sent bluegill to Lake Biwa. Ten years later, bluegill had spread all over the lake. In 2007 in Shiga, Emperor Akihito expressed regret over bringing the bluegill.
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Image search results - "invasive"