gigas have been regularly observed in some commercial French hatcheries, occurring every year during summer in association with a herpes-like virus (Ostreid Herpesvirus 1: OsHV-1). Since 1992 sporadic high mortalities of larval C. gigas summer mortalities remained unclear, but studies suggested a complex etiology in which environmental and physiological conditions of the host (age/weight and sexual maturation) were involved. In late 70ies and early 80ies, high mortalities (more that 50%) of Pacific oyster larvae have been reported in commercial hatcheries from Washington State in USA. gigas appeared resistant to this virus disease. angulata, was highly susceptible to this virus, C. The Pacific oyster may also be infected by different viruses an irido-like virus has been reported infecting French Pacific oysters. gigas was introduced to replace Crassostrea angulata, because significant summer mortalities have occurred since the late eighties. These losses generally denominated as Summer Mortality are typically prolonged and affect older reproductively mature animals during summer months. gigas) have occurred globally for over 5 decades with heavy impact on oyster aquaculture. Pacific cupped oysters will take from 18-30 months depending mainly on water temperature to reach a market size of 70–100 g live weight, > 75 mm shell length.įigure 1. The methods range from culture on the bottom, to suspension in “poches”, baskets, etc., by rope and/or long-lines (Figure 1). There are several different methods used for oyster growing. Problems with low salinity, disease, or other water quality associated problems may delay or inhibit spawning. Oyster culture industry is based on both supply of the spat from the wild and from hatchery, where most of the larvae are produced using a "mass spawning" technique. However, oyster culture is periodically struck by heavy mortalities ranging from 50 to 100%. Pacific oyster ( Crassostrea gigas) is an important species worldwide cultured showing great production figures in many countries such as China, Japan, South Korea, U.S.A., Mexico, New Zealand, Australia, France, UK, Ireland, Spain, Italy, etc. Pacific oyster, crassostrea gigas, malacoherpesviridae, ostreavirus, ostreid herpesvirus-1, OsHV-1 μvar, infection Introduction This mini review reports some studies on the virus Key words For the diagnosis of herpesvirus infection, traditional histopathological methods and biomolecular techniques have been developed, but, to confirm the disease, both methods should be used. Ostreid Herpesvirus-1 is one of the top 50 largest viral genome OsHV-1 μvar is a variant of the virus OsHV-1 showing a systematic deletion of 12/13 base pairs sequence between ORF4 and ORF5. Ostreid Herpesvirus-1 (OsHV-1), OsHV-1 μvar and other variants are herpesviruses causing heavy mortalities, with losses ranging from 50 to 100%, on Pacific oyster ( Crassostrea gigas), an important species worldwide cultured.
0 Comments
Leave a Reply. |