Figure 1.

General organization of zebrafish gills. Schematic representations of the overall anatomy of adult zebrafish gills as observed from the side (A), through a transversal plane across the gill arch (B) and through a coronal plane across gill filaments (C). Section plane are illustrated in (A, B). The blood flows from the afferent artery to the lamellae where it gets oxygenated and leave by the efferent artery. Counter-current to the blood, the water irrigates the lamellae from the efferent aspect to the afferent aspect of filaments. (D) Paraffin section (2 µm) displaying two gill arches through an oblique coronal plane, as illustrated in (A). (E) Paraffin section (2 µm) displaying two filaments through a coronal plane, as illustrated in (A, B). Scale bars: 50 µm (D) and 20 µm (E).