Abstract
The influence of perfusion and ventilation on the uptake of organic chermcals at the gills of rainbow trout was evaluated for a hydrophilic chemical, butanol, and a hydrophobic chemical, decanol. Passive chemical uptake from water was measured in vivo as chemical extraction efficiency and chemical uptake rate after varying gill biood and water flows. An experimental protocol was developed using altered environmental oxygen concentrations to induce trout to increase gill water flow while maintaining control levels of gill blood flow. Subsequently, trout increased gill blood flow and decreased water flow. Uptake rates and extraction efficiency of each chemical measured during pre-hypoxia, hypoxia, and post-hypoxia. were evaluated in terms of observed gill perfusion and ventilation. During hypoxia. gill uptake rate for butanol did not change from pre-hypoxia levels, even with increases in ventilation. Butanol removal from water increased 70% as cardiac output was elevated during post-hypoxia. Uptake rate of the hydrophobic chemical decanol increased to the greatest extent (100% (during hypoxia. with maximally elevated gill water flow. Trout gill uptake of butanol was blood flow-limited while the uptake of decanol was water flow-limited. These empirical measurements are in good agreement with predictions of blood and water flow limitations on chemical uptake proposed in recent flow limited gill models.
Sign-in/Register to access full text options 
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.
