Light and electron microscopic studies on osmoregulatory tissue in the developing brown shrimp, Penaeus aztecus

In larval and early postlarval brown shrimp, Penaeus aztecus, portions of the branchial chamber are lined by a tissue which appears ultrastructurally to be modified for osmoregulation. The distribution of this tissue, the larval stages in which it occurs, and its appearance with the light and electron microscope are presented. The significance of the distribution and ultrastructure of this modified tissue is discussed.