ALKALINE PHOSPHATASE ACTIVITY IN KIDNEYS OF GLOMERULAR AND AGLOMERULAR MARINE TELEOSTS

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Abstract
The kidneys of 35 specimens of 11 marine fish have been studied by histochemical methods for the presence and distribution of alkaline phosphatase. All fish examined, with the exception of the eel, exhibited alkaline phosphatase in the brush border of the "proximal" segment. Since the ten species which exhibited the characteristic location of the enzyme included three aglomerular teleosts (toadfish, pipefish, and goosefish), one equivocal aglomerular teleost (daddy sculpin), four glomerular teleosts (sea robin, puffer, flounder, and long horn sculpin), and two glomerular selachians (skate and dogfish), it is concluded that the enzyme of the brush border must be concerned in tubular processes shared by forms with and without glomeruli. It cannot, therefore, function solely in the absorption of glucose from the glomerular filtrate.

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