Captured: Mysterious oyster killers

Jul 25, 2013
Captured: Mysterious oyster killers
Left: This is an oyster covered in green lesions caused by Denman Island disease. Right: This is a close-up look at the Mikrocytos mackini parasite. Credit: UBC/Department of Fisheries and Oceans

University of British Columbia researchers have apprehended tiny, elusive parasites that have plagued oysters from British Columbia to California.

First reported in 1960, Denman Island disease is caused by Mikrocytos mackini, a parasite that infects mainly Pacific oysters, and leads to unsightly green lesions and death.

"M. mackini has eluded capture for more than 50 years because it lives inside the oyster's cells and has proved impossible to grow and study in a lab," says Patrick Keeling a professor in UBC's Department of Botany who led the microbial investigative team.

The research team from UBC and the Department of Fisheries and Oceans isolated the from infected oysters and analyzed their genes. Details are published today in the journal Current Biology.

"We figured out where M. mackini came from in the evolutionary tree of life – it is part of an enigmatic group of amoebae called Rhizaria that was only itself discovered a few years ago," says Keeling, director of the Centre for Microbial Diversity and Evolution at UBC and a Fellow of Canadian Institute for Advanced Research.

"These parasites have an extremely reduced metabolism. They can't survive in oxygen and its – or cellular powerhouse – can't produce energy, so they probably steals most things from the oyster host in order to survive."

While not considered a to humans, the Denman Island disease makes the raw delicacy unappealing. In B.C., oyster production in 2011 totalled 7,500 tonnes and was valued at $9.2 million.

Explore further: Helping sweet cherries survive the long haul

add to favorites email to friend print save as pdf

Related Stories

The Pacific oyster is in Sweden to stay

Mar 22, 2011

The Pacific oyster was discovered in large numbers along the west coast of Sweden in 2007. The mortality rate in some places during the past two winters has been 100%, but researchers at the University of ...

Recommended for you

Helping sweet cherries survive the long haul

1 hour ago

A new study says that cherry producers need to understand new intricacies of the production-harvest-marketing continuum in order to successfully move sweet cherries from growers to end consumers. For example, the Canadian ...

User comments : 0