Posted on November 19, 2015 by Al B.
More on the emerging ocean acidification issues of aquaculture.
Rob Saunders points a flashlight into the depths of an immense plastic tank at his hatchery, illuminating millions of scallop larvae as tiny as dust particles. “Think of these as canaries in a coal mine,” says the marine biologist turned embattled shellfish farming CEO. It is here at Island Scallops’ facility in Qualicum Beach, located just inland from British Columbia’s shellfish farming epicentre of Baynes Sound, that ocean acidification wreaked havoc. Beginning in 2011, the company’s scallop brood stock (adult shellfish bred over 25 years to be disease-resistant and exceptionally meaty), began to die. Christopher Pollon reports. (The Tyee)
Filed under: Aquaculture, Canada | Tagged: aquaculture, climate change, ocean acidifcation, Shellfish | Leave a comment »
Posted on August 17, 2015 by Al B.
Warning for those of you going out to do some shellfish gathering.
…. The Department of Health found high levels of the marine biotoxin that causes paralytic shellfish poisoning in Hood Canal early this summer, leading the state to close several beaches in Jefferson and Mason counties to shellfish harvest, many for the first time. Aria Shephard Bull reports. (Kitsap Sun)
See also: More shellfish harvest closures in effect in Clallam County; shut areas stretch from Cape Flattery to Jefferson line http://www.peninsuladailynews.com/article/20150816/NEWS/308169987/more-shellfish-harvest-closures-in-effect-in-clallam-county-shut (Peninsula Daily News)
Filed under: Puget Sound | Tagged: biotoxin, hood canal, Jefferson County, mason county, paralytic shellfish poisoning, Shellfish | Leave a comment »
Posted on July 7, 2015 by Al B.
This article swings around from India to Puget Sound, it’s a bit all over the map, literally. But take it as you read it. I think that the point is that continued algal blooms are increasing the incident of red tide, and that if this continues it may be harder and harder to grow shellfish for the size of the commercial markets.
New research suggests that climate change could cause massive poisonous algae blooms, depleting already limited shellfishing industries. Could the solution be something as simple as seagrass? Joseph Dussault reports. (Christian Science Monitor)
Filed under: Puget Sound | Tagged: Puget Sound, Shellfish | Leave a comment »
Posted on December 16, 2014 by Al B.
More news on the science coming in that definitively is pointing to Ocean Acidification being the culprit in hatchery mortality rates here.
The mortality of larval Pacific oysters in Northwest hatcheries has been linked to ocean acidification. Yet the rate of increase in carbon dioxide in the atmosphere and the decrease of pH in near-shore waters have been questioned as being severe enough to cause the die-offs. Now, a new study of Pacific oyster and Mediterranean mussel larvae found that the earliest larval stages are sensitive to saturation state, rather than carbon dioxide (CO2) or pH (acidity) per se. Saturation state is a measure of how corrosive seawater is to the calcium carbonate shells made by bivalve larvae, and how easy it is for larvae to produce their shells. A lower saturation rate is associated with more corrosive seawater. Cheryl Dybas reports. (PHYS.ORG)
And this article follows on it.
For those wanting to understand the science behind “saturation state” you can find the definition down this page. Just “find” saturation state when you get to it. The formula is there.
Filed under: Puget Sound | Tagged: hatcheries, ocean acidification, oysters, Shellfish | Leave a comment »
Posted on December 12, 2014 by Al B.
Oops. Apparently a leaking septic system was to blame. This affects a wide range of fresh oysters in many states. Read the article for more information. Environmental organizations have pushed for well over a decade to get counties to force mandatory inspections of septic systems. However, public outcry against doing it, especially in counties like Mason, have forced voluntary programs. And this is the kind of outcome that happens. Haven been made sick from oysters myself, I can tell you it isn’t fun. I spent almost a week in bed once from the experience, and really felt like I was dying.
Washington state health officials have ordered an emergency harvest closure and a multistate recall of all shellfish from a portion of Mason County’s Hammersley Inlet after at least a dozen people who ate raw oysters became ill. (Seattle Times)
Filed under: Puget Sound | Tagged: Hammersley Inlet, hood canal, Norovirus, oysters, Recall, Shellfish | Leave a comment »
Posted on September 19, 2014 by Al B.
It’s always been a question mark in my mind, about how much of the bad stuff in the Sound are we eating with our delicious meals of shellfish. Now we know. And it’s a good word of caution that if you are regularly eating shellfish, that buying them from growers who are away from urban environments, or harvesting them yourself in remote places, is the best rule of thumb. And it also gives us a very easy way to measure the recovery efforts at work. The bad news is that PCBs, long banned, continue to be found in the water, as do flame retardants. Both are cancer causing. It points out that storm water runoff and our crazy notion that we can pour our sewage into our Sound, have consequences for us.
Scientists used shellfish to conduct the broadest study to date of pollution levels along the shore of Puget Sound. And in some places, it’s pretty contaminated. This past winter the Washington Department of Fish and Wildlife put mussels at more than 100 sites up and down Puget Sound. After a few months, volunteers and WDFW employees gathered the shellfish and analyzed them for metals, fossil fuel pollution, flame-retardants and other chemicals. The WDFW just released the results. [http://wdfw.wa.gov/publications/01643/] Ashley Ahearn reports. (EarthFix)
Filed under: Shellfish, Water Pollution | Tagged: Pollution, Salish Sea, Shellfish, WDFW | Leave a comment »
Posted on August 25, 2014 by Al B.
The State Dept of Health have a new interactive map you can use on your smartphone or tablet when in the field. Want to know if the beach you are clamming on is safe? Try this. https://fortress.wa.gov/doh/eh/maps/biotoxin/biotoxin.html
Filed under: Uncategorized | Tagged: Shellfish | Leave a comment »