Biology
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The Dungeness Crab, Cancer magister, is a Pacific water edible crab. The Dungeness Crab is a member of Phylum Arthropoda and is of the Class Crustacean. The Dungeness Crab is typically light brown with a blue trim and often exhibits a light orange color on its bottom side. The crab has short eyestalks with small orbits, with an uneven broadly oval carapace. The Dungeness Crab can be found naturally in coastal waters from Santa Barbara, California, to the Pribilof Islands, Alaska. Dungeness Crabs are typically found in estuaries from Morrow Bay to Puget Sound, Washington. Figures One and Two (See Appendix) respectively show Puget Sound and Padilla Bay Dungeness Crab habitats and Eelweed habitats that are associated with Dungeness Crab populations. The Dungeness Crab often moves into eelgrass meadows in order to molt in the spring. Eelgrass meadows often form under piers and docks where the lack of sunlight helps them form.The Life Cycle of the Dungeness Crab exhibits four developmental stages: Mating & Egg Development (0-4 Months) The Life Cycle history of the Dungeness Crab is well documented. According to Higgins and Hastings (1997) the females extrude up to 2 million eggs in the fall, larvae are hatched in the winter, and due to pelagic dispersal of larvae in spring, juvenile crabs settle near shore in late spring and
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eational Management; Tribal Management; and, Local Protection Efforts. The Marine Resources Advisory Committee (MRC) of Snohomish County publishes a record of the minutes of its meetings. At the meeting on April 18, 2001, the MRC listed the following possible actions in order to protect Dungeness Crab populations:
Promote regulatory limits on bulkheading.
Advocate for locally tailored harvest seasons.
Produce a Dungeness Crab educational pamphlet.
Compile ordinances that help control shoreline development.
Advocate for improve marine water and sediment quality.
(Snohomish, 2001, 1)
The Dungeness Crab is sensitive to ecosystem changes. Dungeness crab are intolerant of low dissolved oxygen levels and low concentrations of ammonia are toxic. Dungeness Crab larvae are extremely sensitive to a variety of insecticides and fungicides. The habitat is also harmed for Dungeness Crab due to pollutants from development activity like heavy metals, PCBs, and hydrocarbons. The sophisticated Life Cycle of the Dungeness Crab includes a planktonic zoea and megalopa stage (Banks and Dinnel, 2000, 223). When larva settle it appears to be random may is also influenced by current, salt concentration and light levels. However, research demonstr
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Approximate Word count = 1414
Approximate Pages = 6 (250 words per page)
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