Superstitious Belief 2

1. The appearance of crabs and lobsters foretell the end of frost.

2. To cure hydrophobia (fear of water), caught crabs in the light of new moon then burned and ground the crabs to a powder.

Source:

Encyclopedia of Superstitions, Folklore, and the Occult Sciences of the World, Volume 2, by: Cora Linn Daniels, C. M. Stevans