In the shallows amongst the mangrove roots, I found a Goldeen in search of food. These beautiful fish were originally bred by humans and usually kept as decorative ponds but many are now found in freshwater lakes and rivers after trainers let them loose and they began to breed. As an invasive species, they have no natural predators and have been known to disrupt entire eco-systems. Kanto's environmental agency is now trying to move Goldeen from the wild and into enclosed habitats. Young trainers are encouraged to catch them if caught whilst fishing.