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Fig. 4 Organs of adult zebrafish. (A) Diagram illustrating the position of some of the organs; the liver, pancreas, and gonads are not shown. The liver wraps around the anterior part of the intestine. Pancreatic tissue, intermixed with lymphatic tissue, is dispersed along the intestine. The bilateral gonads extend from the central to the posterior part of the abdominal cavity. The vertical line indicates the position of the section shown in B. (B) Transverse paraffin section, hematoxylin/eosin stain. Three crosssections of intestine (i) are seen; segments of pancreatic tissue (p) are located along the intestine. The mesonephros (m) contains renal tubules and some hematopoietic tissue. The spleen (s) is a compact organ containing, almost exclusively, erythrocytes. Bilateral testes (t) are located adjacent to the swim bladder. Cross sections of liver (L) are also seen. (C) Higher magnification of section similar to that in B, showing wall of intestine and adjacent diffuse pancreatic tissue, which has characteristic morphology. Some lymphoid cells are present (arrow); paraffin section, hematoxylin/eosin.