Schematic of urinary tract and gonadal structures in adult zebrafish. The urinary tract and oviducts in female adult zebrafish (A) exit via a separate urethral orifice (black arrow) and oviduct opening (red arrow), respectively. (B) The urinary tract and vas deferens in male adult zebrafish both exit via the urethral orifice (black arrow). Dotted lines illustrate the anatomical locations of key urinary tract structures in the coronal sectioning plane. Dotted line 1, coronal plane of section for the trunk of the kidney; dotted line 2, coronal plane of section for the ureter; dotted line 3, coronal plane of section for the urinary bladder; dotted line 4, coronal plane of section for the urethra. Scale bars: 0.5 cm.
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