How they got there remains a bit of a mystery but it is presumed that they started out as exotic pets which were discarded once they outgrew their aquariums.

• 怎么就到了今天这个地步，多少还是个迷。不过据推测，它们起初是被当作带有外国风情的宠物加以饲养的，不过一旦它们长到玻璃缸难以容纳时，就会被丢弃了。