Browsing Tag: Mussels

    Non-toxic Alternative for Ship Antifouling Technology
    Articles, Blog

    Non-toxic Alternative for Ship Antifouling Technology

    November 21, 2019


    Almost always when you see large ships. they’re are painted red at the waterline and below and these are what are called antifouling paints and so what they do is they keep the shellfish from sticking or fouling to the ships. The way they work is they leach copper ions into the water around the ship and so when the shellfish are in their larval state they can’t handle the large amounts of copper in the water and so they die and they don’t stick. So what our approaches is rather than just killing the animals, it’s look at how the animals are actually making the adhesive and then try to shut down that chemistry without killing the animals. So what we’ve been able to do is form these surfaces or these coatings that have antioxidants in them and we put mussels on them and we’ve measured their adhesion, and sure enough what we’re finding is that the adhesion of the mussels to the surfaces drops significantly when the antioxidants are present.

    Tiny Mussels Invade Great Lakes, Threaten Fishing Industry
    Articles, Blog

    Tiny Mussels Invade Great Lakes, Threaten Fishing Industry

    October 8, 2019


    bjbjLULU JEFFREY BROWN: And next, the story
    of a tiny invader doing big damage to the Great Lakes. Ash-har Quraishi of WTTW Chicago
    reports. ASH-HAR QURAISHI, WTTW Chicago: It’s just after dawn in northern Wisconsin. Commercial
    fisherman Dennis Hickey is getting ready to take his fishing boat out on Lake Michigan.
    Hickey’s family has fished these waters for more than a century. The Great Lakes currently
    support a $7 billion-a-year commercial and recreational fishing industry. MAN: Our mainstay
    of our fishery here in Baileys Harbor is whitefish, Lake Michigan whitefish. ASH-HAR QURAISHI:
    Today, Hickey’s lucky. He won’t be battling the elements to bring in a catch. It is unseasonably
    warm on this late autumn morning. But he does have to deal with a problem that increasingly
    plagues fishermen throughout the Great Lakes and threatens their livelihoods. MAN: Looks
    like the hearts have quite a bit of moss and slime in them again. ASH-HAR QURAISHI: The
    slime is a type of alga called Cladophora, and some scientists think its extraordinary
    increase in the Great Lakes is related to recent and irreparable changes in the Marine
    ecosystem. The culprit, they say, is a tiny invasive mollusk called the quagga mussel.
    TOM NALEPA, Great Lakes Environmental Research Lab: To me it’s one of the worst, if not the
    worst. ASH-HAR QURAISHI: Tom Nalepa is a research biologist with the Great Lakes Environmental
    Research Lab at the National Oceanic and Atmospheric Administration. For the last 20 years, Nalepa
    and his team have been assessing population trends and the impact of the mussel invasion
    on the Great Lakes. TOM NALEPA: They find conditions very suitable and just explode
    in terms of population numbers. And during the period of exponential growth, they wreak
    havoc on other organisms. They take away resources, outcompete native species. ASH-HAR QURAISHI:
    Henry Henderson is director of the National Resources Defense Council. HENRY HENDERSON,
    National Resources Defense Council: They wreck the life that’s in there and create a new
    ecosystem that is dangerous for our health and safety in fundamentally devastating ways.
    You can see it happen in Lake Erie. It’s on the edge of collapse. ASH-HAR QURAISHI: Scientists
    believe the quagga mussel first stowed away in the ballast water on transoceanic ships
    from the Caspian Sea. The mussels made their way into the lakes when that ballast water
    was purged. The tiny fingernail-sized mussels, closely related to another invasive, known
    as the zebra mussel, first appeared in lake waters here in 1988. MAN: These are typical
    quagga mussels in Lake Michigan. They have the striping, as zebra mussels do. They have
    a little flatter shell. ASH-HAR QURAISHI: The quagga mussel is now the most pervasive
    and destructive invasive species ever to enter the Great Lakes. Over the last 15 years, the
    quagga population has exploded, eclipsing the zebra mussel and infecting all five of
    the Great Lakes. Nalepa estimates there are now 437 trillion in Lake Michigan alone. And
    the reason scientists say this dominating mussel is so destructive is that it is wiping
    out critical food at the bottom of the food chain, organisms like plankton, the main food
    source for a shrimp-like organism known as Diporeia. TOM NALEPA: It’s a very important
    fish food organism. Hence, this has led to declines in the growth and condition of fish
    populations that once depended upon Diporeia as a food source. So it’s led to a cascading
    effect from one species to the other throughout the food web. ASH-HAR QURAISHI: In addition
    to altering the food chain in the Great Lakes, these mussels attach to all types of surfaces,
    like boats, buoys and docks. They clog water intake pipes, sometimes cutting off drinking
    water supplies that require expensive remediation, which is why the financial impact from these
    tiny invaders is staggering. The U.S. Fish and Wildlife Service estimates the economic
    losses over the last decade at about $5 billion within the Great Lakes region alone. At the
    DuSable Harbor on Chicago’s Lakeshore, operations manager Kirk Kleist pulls up a dock anchor
    chain to show just us how pervasive the mussels have become in near-shore areas. KIRK KLEIST,
    Chicago Harbors: They load up so much. They cause problems. ASH-HAR QURAISHI: Kleist,
    who has been a diver for over three decades, says he’s seen the dramatic changes in the
    lake water caused by mussel filtering. KIRK KLEIST: Thirty years ago, you had five foot
    of visibility at the max. Now I have seen 40 to 60 foot of visibility. ASH-HAR QURAISHI:
    But scientists say clear water in this clear is in fact a bad thing. TOM NALEPA: Water
    clarity has increased two- or three-fold, just because of the ability of mussels to
    filter all the particles out of the water, which they use as food. So, if you like clear
    water, certainly, when you look out at Lake Michigan, you have it. But clear water also
    means that there’s no food in the water for all the other organisms. ASH-HAR QURAISHI:
    The other side effect of excess clarity caused by the quagga’s filtering is that it encourages
    explosive algal blooms like Cladophora and toxic algae known as Microcystis. HENRY HENDERSON:
    They allow for the first time in the life of the Great Lakes sunlight to pierce all
    the way down to the bottom of the lake from Erie on. And that creates the ability for
    toxic algae to grow, which is poisonous and a threat to our public health and safety.
    ASH-HAR QURAISHI: These images taken by NOAA and the U.S. Geological Survey last month
    reveal just how overwhelming the algae have become in the Great Lakes. A report published
    by the National Wildlife Federation called the toxic algal bloom that infested Lake Erie’s
    western basin this year and caused mass beach closings the most harmful ever recorded. MICHAEL
    MURRAY, National Wildlife Federation: When the Cladophora wash up on beaches, they often
    harbor problematic bacteria, including botulism, which then can negatively impact fish and
    birds that consume somewhere in the food web. ASH-HAR QURAISHI: Michael Murray is a staff
    scientist with the National Wildlife Federation’s Great Lakes office in Ann Arbor, Mich., and
    co-authored the report. Murray says the Great Lakes are experiencing both feast and famine,
    because while algae is growing in record amounts in coastal areas, there is also the formation
    of nutrient deserts in offshore waters. MICHAEL MURRAY: So, the overall effect is, were still
    seeing a lot of — still a nutrients in near-shore areas, major problems with algal blooms, Cladophora,
    those types of problems, and then in the offshore areas, not enough nutrients and major problems
    with the fisheries there. ASH-HAR QURAISHI: Because of the drastic changes in the Great
    Lakes over the last two decades, commercial fishermen say they have had to adapt. Today,
    they’re forced to go further and further out into the lake just to get a good catch. When
    the wind blows, fisherman Dennis Hickey says the algae load up their live entrapment nets,
    making it easier for fish to see and avoid. Hickey and his crew have to spend precious
    time and money to pull out the nets and clean them. MAN: Well, it gets worse every year.
    It’s been — the last five years, I say, it’s been increasing. ASH-HAR QURAISHI: Scrawny
    fish and too much algae have become game-changers for many small commercial fishermen in the
    area. MAN: The smaller fishermen just plain decided to sell out and get out of the business.
    ASH-HAR QURAISHI: And the future of commercial fisheries looks bleak, because scientists
    say removing the mussels from the lake is impossible. TOM NALEPA: Quagga mussels are
    going to be with us now forever, I think. It’s just a matter of, at what abundance does
    the population stabilize? And that’s the key. ASH-HAR QURAISHI: Scientists and activists
    say that, while the focus must shift to preventing the introduction and spread of new invasive
    species into the Great Lakes, the destruction under way by the quagga mussel now serves
    as a painful cautionary tale. hK”7 hK”7 hK”7 urn:schemas-microsoft-com:office:smarttags
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    Top 10 Healthiest Fish To Eat
    Articles, Blog

    Top 10 Healthiest Fish To Eat

    August 13, 2019


    Fish is a great source of Omega 3 fatty acids. This is widely known that fishes are good
    for anyone. To cheat death you should eat more fish. This reduces the risk of cancer and helps
    to increase immunity. Here in this video I will present top 10 healthy
    fish to eat. Number one is Albacore Tuna. Albacore Tuna is an excellent source of protein
    & Omega-3 fatty acid. Caught, while they are young, from US or British
    Columbia, they don’t get enough time to build up high level of mercury. This fish reduces the chance of heart attack,
    stroke, depression related symptoms, arthritis pain etc. Number 2 is Wild Alaskan Salmon. Wild Alaskan salmon, swim against the stream,
    does not produce unhealthy fat & free from artificial coloring, growth hormones, pharmaceuticals
    and other unnatural chemicals. They contain omega-3 fatty acid and vitamin
    A, C, D, E & B-12. This excellent source of protein is low in
    saturated fats and calories. Number 3 is Farmed Oysters. Oyster contains high level of zinc, calcium,
    copper, iodine, iron, potassium, and selenium. The creamy flesh of oysters stands apart for
    its ability to elevate testosterone levels and protect against prostate cancer. It helps to improve men’s sexual health. Number 4 is Wild Pacific Sardines. Sardine is one of the best natural resources
    of Omega-3 fatty acid. The presence of macro-nutrients and micro-nutrients
    in sardines without having high-fat content makes them very useful for our body. It prevents heart disease, blood clots, reduces
    risk of macular degeneration. It strengthens bones and it has anti-cancer
    properties. Number 5 is Rainbow Trout. Rainbow Trout is one of the most affordable
    sea-food options that is an excellent alternative for protein. This is high in omega-3 fatty acids, potassium,
    phosphorus. Rainbow trout is an excellent source of the
    B-vitamin complex, selenium. This is low in contaminants. Number 6 is Mussels. Mussel is another superstar seafood combination
    of omega-3s, protein, B12, and a host of other nutrients. This is a rich source of protein Vitamin A,
    selenium, Vitamin B-12. This assures healthy heart and reduces pain
    of arthritis and other joints. This works great as anti-aging food. Number 7 is Arctic Char. Arctic char is a natural source of protein
    & Omega-3 fatty acid. They are Native to the Arctic waters around
    Canada, Iceland, and Norway. They help to lower blood pressure and hypertension. They also help reducing cardiovascular diseases. Number 8 is Barramundi. Barramundi is a while fleshed fish, native
    to Australia. They are full of Omega-3 fatty acid that reduces
    the chances of cancer. This also assures healthy heart and promotes
    weight loss. With an impressive level of selenium, zinc,
    calcium and magnesium, Barramundi strengthens bones and ensure proper growth. Number 9 us Dungeness crab. Dungeness crabs are the nutritional prince
    to the king crab, yet still share a royal dose of zinc, selenium, and a comparable amount
    of protein and B12. Number 10 is Longfin Squid: Longfin squid
    is a good source of protein. This is low in calories and features no carbohydrate. This is a good source of Vitamin E, B-6, B-12
    & selenium. You don’t have to worry about the cholesterol
    as well. That’s all for today, let us know in the
    comment section if you want us to feature any particular topic of your choice. We publish at least 3 vides a week, so don’t
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    in the next one, ciao ciao.