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Haematological response to reduced oxygen‐carrying capacity, increased temperature and hypoxia in goldfish, Carassius auratus L.
Author(s) -
Murad A.,
Houston A. H.,
Samson L.
Publication year - 1990
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.1095-8649.1990.tb05610.x
Subject(s) - biology , carassius auratus , hypoxia (environmental) , oxygen , population , medicine , endocrinology , cell division , red blood cell , respiratory system , andrology , cell , microbiology and biotechnology , biochemistry , anatomy , fishery , chemistry , fish <actinopterygii> , demography , organic chemistry , sociology
Goldfish were exposed to three qualitatively distinct forms of respiratory stress: phenylhydrazine HCl‐induced reduction in blood oxygen‐carrying capacity; transient (3 h) hypoxia; and transient (1 or 2 h) temperature‐forced increases in oxygen demand. Response embodied three common features: (1) the relative number of immature red cells increased, and these were 3 H‐thymidine positive; (2) the abundance of apparently karyorrhectic or degenerating cells rose; (3) cells undergoing a form of division became prevalent. Neither of the latter two cell types evidenced thymidine uptake. These observations suggest that respiratory distress triggers the proliferation of new erythrocytes, and that this is accompanied by elimination of some portion of the preexisting red cell population. It is hypothesized that the latter process limits viscosity‐related elevation of cardiac work costs. The significance of division by circulating erythrocytes is not clear.