This was going to be fun. Sarah was not the kind to be squemish (she couldn;t really, beinmg the only girl in a family of boys.). She wrote some notes.
Quote:
Plimpies:
Live in lake
Opinion of Merpeople: consider them to be pests as they eat crop and destroy work.
The way they get of them: tie leg in knot an let it drift away.
Result: Younger Plimpies: able to untangle themselves
Older Plimpies: float away and die.
In Hogwarts the house elves have trap to catch the floating ones, dead or alive. The alive ones are untangled and thrown into water while the dead ones are harvested for potions.
How to harvest:
1. Untangle legs-gently
She then proceeded to untangle the legs. Sh liked untangling knots, but this was - different. She copied the professors instructions and untangled her specimen.