OTTAWA - The Canadian Food Inspection Agency (CFIA) is warning consumers not to consume Matjes Herring Fillets in Oil, packed by Yorkfish Co. located in North York, Ontario.  This product may contain Clostridium botulinum bacteria. The Matjes Herring Fillets in Oil is sold in 4.5 kg pails to retail stores in Toronto and Windsor, Ontario only.  Consumers purchasing herring which is packaged at the retail store level are encouraged to check the source of the product with their retailer.