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The Japanese Giant Oyster is larger than our domestic variety, and its edges are so sharp that medical services on the west coast have issued warnings to bathing tourists.
Originally planted in France to be grown as a food oyster, if it had stayed there, everything would have been peaceful and joyful. It’s a good oyster. However, here in Sweden, it has become invasive and is out-competing our native species.
The problem of invasive species is huge; a new species establishes itself somewhere in the world every two months. Unfortunately, there’s no really good way to stop them.
Attempts were made to train sharks to eat the invasive dragonfish, but it was not very successful. Trying to get rid of invasive species by introducing other species to kill or destroy them has proven difficult because the results are too difficult to control. It can go well, but it can also go very badly.