Pacifastacus fortis [SEP] IUCN conservation status
rivers, and feeds on the slime coating the rocks. The animal requires a constant, steady, and untainted flow of fresh water to survive.
Conservation.
"Pacifastacus fortis" is listed as a critically endangered species on the IUCN Red List, and an endangered species under the Endangered Species Act. It has always had a very small native range, and that range has been significantly fragmented by such human activities as damming, mining, and agriculture. The signal crayfish, a recently introduced species, has outcompeted "
Pacifastacus fortis
Pacifastacus fortis (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found only in isolated spots on the Pit River and Fall River Mills.
Description and ecology.
"P. fortis" is thick and stocky, with relatively heavy chelae. It is usually dark brown dorsally with bright orange areas on its underside. It grows about 2-4 inches long. It lives in cold, clear, rocky areas of the mountain