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Histological and enzyme histochemical studies on the nephrons of the freshwater fishes, Cyprinus carpio and Carassius auratus
Author(s) -
Endo Makoto,
Kimura Masao
Publication year - 1982
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051730104
Subject(s) - cyprinus , carassius auratus , biology , zoology , enzyme , danio , anatomy , fishery , fish <actinopterygii> , biochemistry , zebrafish , gene
The nephrons of carp ( Cyprinus carpio ) and goldfish ( Carassius auratus ) were examined histologically and also histochemically for enzymes. In both species the distal and collecting tubules have much wider lumens than do the other renal tubules; thus urine probably flows more slowly in these larger tubules. Enzyme histochemistry shows that epithelium of the neck and proximal and intermediate tubules respires anaerobically. whereas that of the distal and collecting tubules respires aerobically. The distribution of Na‐K‐ATPase in the distal and collecting tubules indicates that they also transport sodium actively. The slow flow of urine and the energy produced by aerobic metabolism probably increase the efficiency of active transport.