The red swamp crayfish (Procambarus clarkii), an alien species native to the southern United States and northern Mexico, was introduced into China from Japan in 1929. Its prolific reproduction, rapid growth, omnivorous diet, and broad adaptability have enabled it to colonize and thrive across China.
I desire to alter the natural ecosystem so I can farm freshwater crabs in the local river. Though I need to be careful to not do irreparable damage to the natural habitat. Wouldn't want to become an ecoterrorist.