In 1863 she appeared to a small band of lost whalers to guide them home. Desperate and starved, they harpooned her instead. When they tossed what remained of her overboard, they had picked her piscine extremities to the bone, but left the top intact for to avoid the taboo of consuming human flesh. It's said her spirit returns yearly, approaches sailors lost, and performs the taboo 'mercifully' spared of her upon their wayward souls.
I never participate in Mer-May, so how about Mer-tober? Doesn't have the same ring to it.
Actually this is for this month's CDC over on Facebook. I think it's been exactly 2 years since I participated. I'm not a massive Halloween fan, but for some reason that seems to be the only time I think to look at the theme and decide to join.