this post was submitted on 25 Apr 2024
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[–] kbin_space_program@kbin.run 10 points 6 months ago (2 children)

Usually farmed fish, or wild fish caught near fish farms, are the ones riddled with parasites.

[–] protist@mander.xyz 50 points 6 months ago (2 children)

Pretty sure parasites are widely present among wild fish. Not defending fish farms, but parasites aren't only present on fish farms

[–] tb_@lemmy.world 11 points 6 months ago (1 children)

aren't only present on fish farms

No. But if you keep a lot of fish really tightly packed in the same place those parasites will have a much easier time spreading.

[–] protist@mander.xyz 6 points 6 months ago (1 children)

Yes. Again, my point is that fish parasites are widely present in wild fish populations and have been since before fish farming existed

[–] tb_@lemmy.world 4 points 6 months ago

Yes... But with open net fish farming you get more fish with parasites and more parasites per fish. So it was a lesser problem before.

[–] kbin_space_program@kbin.run 3 points 6 months ago (1 children)

https://westcoastnow.ca/2024/01/12/herring-deaths-raises-concerns/

Open net fish farms are proven to increase parasite counts on nearby wild stock

[–] protist@mander.xyz 14 points 6 months ago

Sure, but parasites are still widely present in wild populations

[–] Chozo@fedia.io 2 points 6 months ago* (last edited 6 months ago) (1 children)

Pretty sure that's a selection bias, since most fish that are eaten - or would otherwise be examined for parasites - are farm-raised fish.

[–] kbin_space_program@kbin.run 1 points 6 months ago (1 children)

No, that's the Canadian Department of Fisheries and Oceans official study:

https://westcoastnow.ca/2024/01/12/herring-deaths-raises-concerns/

[–] huginn@feddit.it 6 points 6 months ago* (last edited 6 months ago) (1 children)
  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.

[–] kbin_space_program@kbin.run -5 points 6 months ago

Then you didnt read it.

Fact is that open water fish farms devastate wild stocks.