Ostreid herpesvirus (OsHV) was detected in moribund Pacific oyster spat as well as in surviving adults.
Flat oysters Ostrea edulis and blue mussels Mytilus edulis were unaffected. All size classes were affected, and affected populations displayed a patchy distribution with heavily affected and unaffected populations in close proximity. Surveys and collected data showed that mortalities mainly occurred during 3 wk in September. After this period, high and sudden mortalities occurred in a Swedish hatchery and in wild populations along the Swedish west coast and south coast of Norway. After the spawning season in 2014, the temperature of the surface water peaked at 24-26☌. Massive settlements were recorded in many areas along the Swedish west coast and southern Norway in 20. The Pacific oyster Crassostrea gigas: Part I. It has become an introduced species in North America, Australia, Europe, and New Zealand. The Pacific oyster, Japanese oyster, or Miyagi oyster ( Magallana gigas 1 ), is an oyster native to the Pacific coast of Asia. The expansion is presumably a result of northwards larval drift. Proliferation of species introduced for aquaculture can threaten the ecological and economic integrity of ecosystems. Several studies collecting wild oysters indicated sampling occurred in areas with high amounts of human activity and increased pollution rates (Li et al., 2018 Waite et al., 2018. Video of an adult exemplar as it responds to stimulation by light. The Pacific oyster Crassostrea gigas has recently expanded its range in Scandinavia.
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