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First published online October 31, 2008
Journal of Experimental Biology 211, 3519-3521 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.013599

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A FIRST LOOK AT HOW FISH GILLS WORK

Steven F. Perry

Universität Bonn

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View larger version (37K): [in this window] [in a new window]   Fig. 1. Schematic representation of a teleost gill showing portions of two filaments and their secondary lamellae. The direction of blood flow in the secondary lamellae is opposite to that of the water flow between them (countercurrent system). Note the extensive secondary circulatory system, including the central venous sinus and the secondary branchial arch vein. The afferent branchial vessels (in blue) carry oxygen-poor blood into the gill, whereas oxygen-rich blood (in red) is either returned to the branchial arch for distribution to the body or stored in the central venous sinus and eventually returned to the heart in the branchial veins.

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