Not Medical Advice: Yes, you can eat up to two 6 oz. servings each week of sea urchin while pregnant as this is very low in mercury.
According to the NRDC (National Resources Defense Council), many of the main sushi type fish contain high levels of mercury and should be completely avoided or eaten very rarely.
The FDA has identified four fish with the highest levels of mercury that should be avoided during pregnancy. These include tilefish from the Gulf of Mexico, swordfish, shark, and king mackerel. Albacore tuna should also be limited to 6 ounces per week.
Sushi with Lower Levels of Mercury that pregnant women can enjoy up to two 6-oz servings a week:
Akagai (ark shell)
Anago (conger eel)
Aoyagi (round clam)
Awabi (abalone)
Ayu (sweetfish)
Ebi (shrimp)
Hamaguri (clam)
Hamo (pike conger; sea eel)
Hatahata (sandfish)
Himo (ark shell)
Hokkigai (surf clam)
Hotategai (scallop)
Ika (squid)
Ikura (salmon roe)
Kaibashira (shellfish)
Kani (crab)
Karei (flatfish)
Kohada (gizzard shad)
Masago (smelt egg)
Masu (trout)
Mirugai (surf clam)
Sake (salmon)
Sayori (halfbeak)
Shako (mantis shrimp)
Tai (sea bream)
Tairagai (razor-shell clam)
Tako (octopus)
Tobikko (flying fish egg)
Torigai (c0ckle)
Tsubugai (shellfish)
Unagi (freshwater eel)
See a list of fish used in sushi and where they rank in their levels of mercury at the American Pregnancy Association.
Learn some healthy pregnancy nutrition tips from Parents.