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Pacifastacus fortis (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found and first described in 1914, only in isolated spots along the Pit River and Fall River Mills. [4] It is estimated that there are a total of roughly 4000 of the species still alive today. [5]
The signal crayfish (Pacifastacus leniusculus) is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the North European Astacus astacus fisheries, which were being damaged by crayfish plague , but the imports turned out to be a carrier of that disease.
In 1990, Louisiana produced 90% of the crawfish in the world and consumed 70% of it locally, [13] but by 2003, Asian farms and fisheries produced more, outpacing American production rapidly. By 2018, P. clarkii crawfish production in the Americas represented just 4% of total global P. clarkii supply. [14]
At the 2024 festival, vendors will serve up thousands of pounds of crawfish along with Cajun-inspired dishes, such as alligator, frog legs, gumbo and jambalaya, according to the Cal Expo website.
Crayfish usually have limited home range and so they rest, digest, and eliminate their waste, most commonly in the same location each day. Feeding exposes the crayfish to risk of predation, and so feeding behaviour is often rapid and synchronised with feeding processes that reduce such risks — eat, hide, process and eliminate.
Pacifastacus nigrescens, the sooty crayfish, is an extinct species of crayfish in the family Astacidae. It was originally described in 1857 by William Stimpson from the area around San Francisco , where it was once common in the creeks surrounding San Francisco Bay .
The Big Sandy crayfish is listed as threatened wherever found under the ESA. [2] It was originally reviewed for listing in 1991 when it was known as C. veteranus. The crayfish was proposed to be listed as endangered with C. veteranus on 7 April 2015, which is when the two new species were distinguished in the ESA (ECOS 12 month finding). [6]
University of California. 2021 "California Terrestrial and Vernal Pool Invertebrates of Conservation Priority". California Department of Fish and Wildlife. 12 June 2017 "Giant Isopod". Aquarium of the Pacific. 2023; Gordon Ramel. "The Invertebrate Phyla". "Intertidal Field Guide".
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