Ocean Surgeon Acanthurus bahianus <Click on image for magnified view.>     Gills (100x). a) primary lamella. b) secondary lamellae.     Gills (250x). a) primary lamella cartilage. b) secondary lamella. The gills' function as an environmental interface makes it one of the first sights of pathology development. Hyperplastic or hemorrhagic secondary lamellae are often indicative of environmental or pathogenic problems.

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