this post was submitted on 25 Apr 2024
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[–] tb_@lemmy.world 11 points 5 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 5 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 5 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.