Vascular Specialization in Fish, but No Evidence for Lymphatics

Abstract

Blood distribution in the systemic circulation of bony fishes is effected by a dualistic construction of the vasculature: A secondary arterial system originates from the well known (primary) arteries by multiple root-like shunt vessels. These secondary arteries and the vessels they supply should no longer be regarded as lymphatics. After an intensive search for unequivocally lymphatic vessels in fish, it appears doubtful whether there are any at all in this class of vertebrates. © 1981, Walter de Gruyter. All rights reserved.