• huginn@feddit.it
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      6 months ago
      1. That article neither supports nor denies your claim: it just says parasites have evolved resistance to what was previously used against them.

      2. The major issue there is with the anti parasite treatment: that is what is killing herring.

      3. Parasites do not magically appear from nowhere. They are species which have co-evolved with their hosts for millennium. These fish parasites are extremely common across the entire ocean. Farms just provide a place for large groups of fish to get infected.

      All of which is to say that parasites in fish are common in wild fish which are never near farms.