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blue swimmer crab
an edible Australian crab, Portunus pelagicus, of blue-green colour and capable of powerful sustained swimming; sand crab. Compare blue manna crab. Also, blue swimmer.
Contributor's comments: On holidays at the coast we caught/ate blue swimmers. When we were at home catching freshwater yabbies from farm dams we referred to the big yabbies with blue claws as "blue nippers".