Hardening of Red King Crab Paralithodes camtschaticus (Tilesius, 1815) Shells after Molting

Bradley G. Stevens

doi:10.1651/08-3039R.1

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Bradley G. Stevens^1,2

¹National Marine Fisheries Service, Alaska Fisheries Science Center, Kodiak Fishery Research Center, 301 Research Ct., Kodiak, Alaska, 99615
²Current Address: School for Marine Science and Technology, University of Massachusetts Dartmouth, 706 S. Rodney French Blvd, New Bedford, MA 02744. Ph: 508.910.6323, Fax: 508.999.8197; ( ) bstevens@umassd.edu

Abstract

Shell hardness was measured with a durometer for female red king crabs, Paralithodes camtschaticus, held in the laboratory over variable periods up to 107 days after molting. The data were fit best by a hyperbolic equation, with parameters β₀ = 0.216 and β₁ = 0.019 (R² = 0.976, n = 199), and an asymptotic value of 50.7 durometer units (DU). The time required to reach 90% of complete shell hardness (H₉₀ = 45.6 DU) was calculated to be 74.2 days. Molting dates for all crabs were hindcast using the last measurement that was less than H₉₀ and were within 2.5 ± 6.4 days (mean ± SE, n = 34) of the actual molting date.

Citation Download Citation

Bradley G. Stevens "Hardening of Red King Crab Paralithodes camtschaticus () Shells after Molting," Journal of Crustacean Biology 29(2), 157-160, (1 April 2009). https://doi.org/10.1651/08-3039R.1

Received: 8 May 2008; Accepted: 1 July 2008; Published: 1 April 2009