Ocean-bound fish farms are increasingly unsustainable. Land-based salmon farms can address environmental challenges

Salmon is the second-most-popular seafood in the United States, where the average American consumes more than three pounds a year. (Shrimp is No. 1, with average annual consumption reaching nearly six pounds in 2021.)

About 10 to 20 percent of this is wild Pacific salmon, most of which comes from well-managed fisheries in Alaska. But the rest is imported farmed fish raised in open net-pens in the ocean, a much-criticized system made even more problematic by rising water temperatures and other climate challenges.

Now, several land-based farms across the country are beginning to offer a more climate-stable alternative to traditional salmon aquaculture — one that’s cleaner, more ecologically responsible and potentially has a lower carbon footprint.

So far, their fish is available only in local markets, most of them in Florida, New York and Wisconsin. But experts say that land-based farming is the future of salmon aquaculture in America — and the world, as similar businesses gain footing in countries like Denmark, Norway, Switzerland, Poland and Japan.

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“Land-based technology is already viable,” [Brian Vinci, the director of the Conservation Fund’s Freshwater Institute] said. “We are 25 to 30 years away from replacing 50 to 70 percent of our imported farmed salmon with domestically raised fish.”

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What you need to know about the fast-mutating strains of COVID-19

It’s still unclear how successful a vaccine against SARS-CoV-2, the virus that causes Covid-19, can be.

A lot will depend on how the virus mutates. Broadly, there are two ways mutations can play out.

Scenario 1: The coronavirus is unable to evade a vaccine

Vaccines work by prompting the body to develop antibodies, which neutralize the virus by binding to it in a very specific way. Scientists are watching to see if mutations will affect this interaction. If they don’t, then there is hope that a vaccine won’t need constant updating.

That same process has played out with our most effective vaccines, including the one against measles.

Scenario 2: Mutations make vaccines less effective over time

But what if the virus doesn’t get cornered like measles? If the virus mutates in a way that prevents antibodies from binding, it could make a lasting, universal vaccine difficult to create.

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“What will happen in many viruses is you’ll get infected by Strain A; your immune system learns to recognize that surface protein, but then the virus is able to mutate in such a fashion that it still performs its function but make it so that your antibodies against Strain A no longer recognize Strain B,” Dr. [Trevor] Bedford said.

Versions of the virus with mutations that get around the population’s immunity are more likely to spread, and can then develop into new strains.

The takeaway: We’ll have to wait and see

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