Question of the Week Answer
Answer: A, B & C - The Shasta Crayfish is endangered by habitat loss from water diversions, predation, and competition with the exotic signal crayfish (Pacifastacus leniusculus) and other species.
The Shasta crayfish is a small- to medium-sized crayfish. The total length of its carapace (shell covering the back over the walking legs) may reach 2.5 to 5 cm (1-2 inches.) Color is variable and may range from dark brownish green to dark brown on the topside and bright orange on the underside. Members of the Fall River population are dark orange-brown on the topside and bright red on the underside, especially on the chelae (pinchers). These colors provide camouflage for the crayfish among the volcanic rubble substrates of its habitat.
#DYK The California Freshwater Sport Fishing Regulations includes a Closure on the take and possession of the Shasta Crayfish for its protection.
Sources: U.S. Fish and Wildlife Service, California Department of Fish and Wildlife
Photo: Koen G. H. Breedveld / Spring Rivers Ecological Sciences LLC
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