A wheelwright is  a craftsman who builds or repairs wooden wheels. The word is the combination of wheel and the archaic word wright, which comes from the Old English word wryhta, meaning a worker or maker.
It is advisable not to eat mercury-rich fish such as these during pregnancy.. Look out for fish that taste especially metallic, a sign of high mercury levels. Medium-mercury fish include Chilean sea bass, grouper, cod, Mahi Mahi, monkfish, and snapper. Low-mercury fish are the safest for pregnant women.
However, breastfeeding mothers should pay attention to the preparation of the sushi they are eating. They should go to restaurants who only use flash-frozen fish for their sushi, and only order sushi and sashimi made of fish low in mercury. If you are a sushi-lover, the hardest thing about pregnancy will be the diet.