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Gill damage at the end of the experiment. H-E stained sections of healthy and damaged gills. (A), non-damaged gill at the beginning of the experiment with well-structured primary lamellae (PL) and secondary lamellae (200×) (SL). (B–D) Different examples of gill disorders at the end of the experiment (400×). Secondary lamellae hyperplasia (HYP) and edema (ED), lamellar fusion (LF), and loss of structure (LE) as well as severe circulatory disruptions (cd) are labelled in the figures.
