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https://www.noaa.gov/media/digital-library-photo/pl23fizh2004jpgDescription
Male (lower) and female (upper) Alaska king crab (Paralithodes camtechatica).Male crabs are considerably larger than females. The spiny exoskeletonprovides protection from enemies. (Image credit: NOAA Central Library Historical Fisheries Collection | Steve McCutcheon)
Credit
NOAA Central Library Historical Fisheries Collection
Photographer
Steve McCutcheon
Collection
Historic Fisheries