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Tag: salmon

Four fish fight for the future

Posted on January 4, 2012 By Andrew Thaler
Conservation

How much of the world’s food supply is locked up in a few crops – corn, wheat, rice (for example) – and even fewer livestock – cows, pigs, chickens? Of the major commercial food production industries, only fish, and even then, only some fish, are still hunted. In a very real sense, fish are the last wild food. That may be changing. In Four Fish: The Future of the Last Wild Food, published last year, Paul Greenberg highlights the ways in which commercial fishing is becoming less like hunting and more like agriculture, with a few, often farm raised species, dominating the market.

Greenberg, a native of Long Island Sound who fished there since the 1970’s, documents the changes in four major fisheries – salmon, sea bass, cod, and tuna – and the changing attitudes of the (mostly) men who catch them. He travels to Alaska to meet with First Nation salmon fishermen, to Greece to visit groundbreaking aquaculture facilities, he charters a tuna boat to experience the fight first hand, and across the world he talks to those of whom fishing matters most, including himself. At times, the book becomes autobiographical, focusing on Greenberg’s personal journey – but this is a book about fish and fishermen, and he is, if only recreationally, a fisher.

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Salmon, aquaculture, and the spread of Infectious Salmon Anemia

Posted on October 27, 2011October 28, 2011 By Andrew Thaler 3 Comments on Salmon, aquaculture, and the spread of Infectious Salmon Anemia
Science

Coho salmon - public domain image
Coho salmon - public domain image

In 2008, a deadly virus decimated Chilean aquaculture facilities, causing $2 billion in damage and crippling an industry. This week, preliminary reports suggest that this same disease may have infected wild salmon in the north Pacific. The internet has been blowing up with news reports of Infectious Salmon Anemia (ISA) detected in wild salmon populations. Reports range from balanced – Deadly Fish Farm Virus Found in Wild Pacific Salmon – to hyperbolic – B.C.’s salmon feedlots need to be closed – but all hinge on the fact that ISA, a lethal salmon-infecting virus previously resigned to aquaculture facilities, has been detected in wild salmon populations in British Columbia. This has the potential to be a very big deal. ISA is 90% lethal and mortality occurs in 10 days or less. The virus is waterborn, but can also be transmitted through handling with contaminated equipment. There is no treatment once a fish is infected.

Before I go on, a couple points need to be clarified:

  1. ISA does not infect humans, though as it threatens a fishery and a major agricultural industry, it most certainly affects humans.
  2. ISA was isolated from 2 wild sockeye salmon. It has not been confirmed from independent test yet, although one statement indicates that the current infection is from a non-infectious strain of ISA (which raises some interesting questions about who currently knows what about this outbreak).

Read More “Salmon, aquaculture, and the spread of Infectious Salmon Anemia” »

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