Male (lower) and female (upper) Alaska king crab (Paralithodes camtechatica).
Male crabs are considerably larger than females. The spiny exoskeleton
provides protection from enemies.
Image ID: fizh2004, NOAA's Historic Fisheries Collection
Photographer: Steve McCutcheon
Credit: NOAA Central Library Historical Fisheries Collection
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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April 30, 2013