This disease is the most imminent threat to the West Coast and Hawaii shellfish farming industry. Our overall goal was to test a method to allow shellfish hatchery operators and farmers to screen individual oysters for resistance to the Ostreid Herpesvirus (OsHV-1). Thus,ĭeveloping resistant Pacific Oysters for commercial production can be jumped started ahead of anĮmergency, rather than waiting 8-10 years for more traditional approaches to succeed. Of the nine families, one family demonstrated a very high level of resistance (87% survival) and several others varied between 40-50%. Half of each family was retained at the Hawaii hatcheries for future use in breeding. Nine families were created, then tested for resistance by outplanting half of each family in Tomales Bay to expose them to the virus. Sperm and the warm Hawai`i conditions to reduce generation time. This method is based on using individual pair spawns, cryopreservation of can make immediate use of this since they have considerable lossesĪnnually due to this disease. and the Willapa Bay Fish and Oyster Co.) proposed to test a more rapid screening method to determine whether individual oyster broodstock possess some degree of resistance and thus begin to form the basis of broodstock pools to be used in an emergency situation if the virus spreads outside of Tomalesīay. The three oyster companies involved in this proposal (Goose Point Oyster Co., Hog Island Oyster Co. Although research is being conducted to develop OsHV-1 resistant strains, this research is slow and takes at least 2-3 generations to develop partial resistance and potentially millions of dollars. Losses can be up to 35% through the growout stage.
Up to 90% of juvenile oysters can be lost each year and cumulative variant OSHV-1 is so far only present in Tomales Bay (CA) and adjacent areasīut is only slightly less damaging. Other commercial species of bivalves are vulnerable in Industries in Australia, Europe and New Zealand. One variant (OsHV-1µVar) of this virus has devastated Pacific Oyster culture The Ostreid Herpesvirus is a highly lethal virus and is the most imminent threat to the survival of the U.S.
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