Tubs of herring sold by Royal Sweet Bakery in Brooklyn, N.Y., are being recalled by the company, warned the U.S. Food and Drug Administration. The packages may contain fish that have been improperly eviscerated and possibly cause Botulism, a serious and potentially fatal food-borne illness.

The recalled fish, Herring in Vegetable Oil Filling, comes in 49.38 ounce jars with date codes of 06.04.2011 and 09.06.2011. The tainted herrings are a product of Russia and were sold nationwide by the Brooklyn company.

Officials warn that herring viscera are likely to contain high concentrations of Clostridium botulinum, spores that cause botulism poisoning. Eating the improperly eviscerated fish may cause blurred or double vision, general weakness and poor reflexes, difficulty in swallowing and respiratory paralysis.

No illnesses have been tied to the recalled herring.