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Stress‐induced water permeability changes in the tropical cichlid, Oreochromis niloticus (Trewavas)
Author(s) -
Adedire C. O.,
Oduleye S. O.
Publication year - 1984
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1984.tb04893.x
Subject(s) - hypercapnia , biology , acclimatization , oreochromis , permeability (electromagnetism) , zoology , fishery , ecology , anatomy , biochemistry , respiratory system , fish <actinopterygii> , membrane
The effect of short‐term, experimentally‐induced stress on the branchial water permeability of Oreochromis niloticus was studied. Both handling and thermal stress increased water permeability but apparently by different mechanisms. The enhancement of water permeability by acclimation temperatures and acute temperature changes had Q 10 of 3.52 and 2.24 respectively. Environmental sodium concentration and acute hypoxia had no effect while hypercapnia and mild anaesthesia decreased water permeability. Both hypercapnia and mild anaesthesia probably elevated arterial pCO 2 with a concomitant reduction of metabolism.