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Oyster Killer Revisited

In 2003 Catalyst reported on a mysterious disease that had wiped canada goose jacket outlet sale out parts of the Sydney Rock Oyster industry. We followed two scientists who were on the trail of how to thwart this oyster killer. Qx slaughtered their crop and they lost their leases, lost their vessels, lost the works.

buy canada goose jacket Dr Paul Willis: The oyster killer was a disease known as QX. Back in 2003 Rob Adlard had been working on QX for nearly 10 years and he had figured out how it kills. buy canada goose jacket

canada goose uk outlet Dr canada goose outlet buffalo Rob Adlard: What it seems to do is take out the digestive gland, and canada goose kensington parka uk effectively the oyster starves to death because it can’t then process its food. canada goose uk outlet

canada goose coats on sale Dr. Paul Willis: We also met Dave Raftos an immunologist trying to find out why QX had affected some estuaries, but left others untouched. He focused on a crucial canada goose stockists uk component of the canada goose outlet las vegas oyster’s immune canada goose outlet washington dc system, an enzyme called phenyl oxidase. canada goose coats on sale

canada goose uk shop Dr Dave Raftos: In the Hawkesbury River, which has never been affected by QX disease, phenyl oxidase activity is much higher than it is in oysters from the heavily QX infected Georges River. canada goose uk shop

Canada Goose Parka Narration: Dave theorised that high levels of phenyl oxidase indicated a healthy immune system protecting the oysters from QX. If phenyl oxidase levels dropped , the immune canada goose outlet mall system would collapse allowing QX to attack. So oysters with canada goose outlet belgium high levels of phenyl oxidase, like those on the Hawkesbury River, appeared to be canada goose coats uk protected against Qx. Canada Goose Parka

canada goose clearance sale But, almost four years on. I caught up canada goose jacket outlet store with Rob Adlard on canada goose parka uk the Hawkesbury. canada goose clearance sale

cheap Canada Goose Dr Rob Adlard: I think canada goose factory outlet vancouver last time we talked, I was doing a surveillance program. The irony of course is as soon as that surveillance program finished, we had this massive outbreak, especially around this lease we’re sitting on at the moment. cheap Canada Goose

cheap canada goose uk Narration: The QX outbreak on the Hawkesbury River in 2005 wiped out most of the oyster growing areas. Since then Rob Adlard’s team have been trying official canada goose outlet to find out why the oysters immune systems collapsed canada goose outlet germany and how the canada goose outlet online store review disease is transmitted from oyster to oyster. cheap canada goose uk

Canada Goose sale Dr Rob Adlard: canada goose outlet store uk It seems like a, you know, a very large haystack and a very small needle. Canada Goose sale

Dr Paul Willis: Any hunches as to where it might be?

Canada Goose online Rob Adlard: Well, at the moment we’re still fairly keen on polychaete worms that live in little mud tubes in the sediment here We’re canada goose discount uk finding one, really dominant species, very much canada goose outlet store quebec associated with oyster leases. Canada Goose online

canada goose factory sale Narration: As Rob tries to find out how the disease spreads get redirected here , Dave Raftos has refined his theories about the oyster’s immune system and its’ defence against QX. canada goose factory sale

uk canada goose Dr Dave Raftos: Last time I talked to you, I was talking about a particular gene called phenyl oxidase which we think helps oysters fend off the disease under normal circumstances and the more we look at that gene system, the more we think, yeah, this is critical to developing disease resistant oysters. uk canada goose

canada goose coats Narration: Growing QX resistant oysters has been canada goose outlet hong kong the job of the NSW Department of Fisheries. Survivors from the George’s River attack were rounded up and crossbred to produce a new ‘super oysters’ that’s currently being trialled by growers on the Hawkesbury. canada goose coats

Canada Goose Coats On Sale Robbie Moxham: They’re going really good. We’re very optimistic about it. It’s canada goose outlet winnipeg a fairly long term project with them but they’ve been through their first infection and they’re growing well and we hope to be growing them in the future. Canada Goose Coats On Sale

canadian goose jacket Narration: It’s been twelve years since QX first struck in the Sydney area. Now a combination of Rob and Dave’s work as well as the new QX resistant “super oyster” will help to put the 33 million dollar Sydney Rock oyster industry back into business canadian goose jacket.