Abstract
Changes in blood respiratory properties and cardiovascular function of Channa maculata are described in fish acutely exposed to water of different oxygen tensions. The oxygen dissociation curve of the blood was hyperbolic, and the blood had a high oxygen affinity (P50= 7.6 mm Hg at pH = 7.6) and a large Bohr coefficient. The persistently higher blood oxygen level in the dorsal aorta compared with that in the bulbus arteriosus regardless of the ambient oxygen tensions tends to support Ishimatsu and Itazawa's (1983) suggestion that oxygenated and deoxygenated blood could be. at least partially, separated in the heart of Channa. Acute exposure to hypoxic water induced insignificant changes in blood oxygen tension and saturation. However, bradycardia, hypotension, haemodilution and antidiuresis were observed in fish exposed to severely hypoxic (PO2≤ 30 mmHg) but not to moderately hypoxic (PO2= 50 mmHg) water. These data suggested that Channa maculala possessed adaptive blood respiratory properties and blood circulation pattern to allow the fish to take up oxygen from air without significant branchial oxygen loss to the surrounding hypoxic water.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
