Fish poop in the very water from which they obtain their oxygen. How do they stay healthy? Through an ingenious and sensitive system in the gills.
Gills are possibly even more interesting than brains, says Geert Wiegertjes, Wageningen Professor of Aquaculture and Fisheries. ‘Gills function as lungs, kidneys and immune system. Brains are no match in complexity.’ In collaboration with international colleagues, he studied which tissues in the gills are crucial to the fish’s health and how these tissues have developed through evolution.
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