Krepsödade

Krepsödade is a term that can refer to two distinct but related concepts within Swedish folklore and entomology. In folklore, it is often used to describe a folk belief or superstition surrounding the "death" or decline of crayfish, particularly during certain times of the year. This was sometimes associated with natural phenomena like changes in water temperature or the crayfish's molting cycle, which can make them more vulnerable or less visible. The term itself literally translates to "crayfish death" or "crayfish demise."

In a more literal, biological context, "krepsödade" can also refer to an actual epizootic, or a widespread outbreak of disease, affecting crayfish populations. The most significant and well-documented krepsödade in Sweden occurred in the early 1900s, caused by the crayfish plague (Aphanomyces astaci). This fungal disease devastated native European crayfish populations, leading to significant ecological and economic impacts, as fishing for crayfish is a traditional and important activity. The introduction of a disease-resistant American crayfish species was later part of the efforts to manage the impact of the plague. The term, therefore, encapsulates both the cultural perception of crayfish mortality and the biological reality of devastating disease outbreaks.