Both saltwaters fish hobbyists and freshwaters fish hobbyists can now merge. It commenced from an invention of Yamamoto Toshimasa who "forced" saltwater ornamental clown fish Amphiprion percula and sea horse Hippocampus sp to live in freshwater habitat together with goldfish Carrasius auratus and some other freshwater ornamental fish such as ornamental gouramy, platy, and guppy.