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.
I ate it one or two times my 2nd pregnancy with no issues, and have had it once with this pregnancy (my 3rd one). Also-California rolls, and others that do not contain raw fish or high mercury fish are definitely ok, and I eat a ton of that kind of sushi.