Help: Is the crab a forbidden motif of art in Europe?

Hi. I am from China. An artist friend here has designed some porcelain items featuring crabs which he plans to sell at a beach resort. But we have noticed the image of the crab appearing in western postal stamps commemorating human health achievements and in the logos of some health organizations, in which it symbolizes cancer. We understand that the origin of this symbolism perhaps has to do with the Greek word for crab, and there is Cancer the zodiac sign. My question: Is the crab a forbidden art motif in the west for this symbolic reason? Does the ordinary western tourist tend to avoid buying items featuring the crab for souvenir or gift? Or could the mere sight of a crab image in a store inspire enough unpleasant feelings in the western tourist to drive them out immediately? We are quite confused, with one out of a dozen humans having to be born Cancerian according to western astrology and gifts bearing the sign and it's English name seen everywhere even here in China.

Just how would you feel if you chance upon a porcelain crab in a souvenir store at some beach resort?

Thank you for your help.