• s_s@lemm.ee
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      8 months ago

      Carotenoids are produced by algae, plants and certain fungi.

      Feeding fish higher-level animals in the food web (like crustaceans or fish that predate on crustaceans) concentrates the carotenoids and brings out more and more color in the fish, specifically red.

        • s_s@lemm.ee
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          8 months ago

          Mercury is more highly concentrated in higher-level organisms in a similar fashion, yes.

          But mercury itself has nothing to do with coloring.

    • Omgarm@lemmy.world
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      8 months ago

      This is also the source of a flamingo’s colour. The debate if salmon are fishy flamingos or flamingos are feathery salmon has yet to be settled.