{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,14]],"date-time":"2026-05-14T20:51:08Z","timestamp":1778791868773,"version":"3.51.4"},"reference-count":42,"publisher":"The Company of Biologists","issue":"12","license":[{"start":{"date-parts":[[1995,12,1]],"date-time":"1995-12-01T00:00:00Z","timestamp":817776000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/www.biologists.com\/user-licence-1-1\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1995,12,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>Gill O2 uptake, CO2 excretion, ventilation and blood respiratory\/acid\u2013base variables were evaluated in control and softwater-acclimated trout (Oncorhynchus mykiss) to test the hypothesis that gill chloride cell (CC) proliferation, elicited by 2 weeks of softwater exposure, impairs the diffusion of respiratory gases across the gill. The proliferation of CCs in softwater fish was verified using light microscopy, and its impact on respiratory gas transfer was assessed in vivo by continuous monitoring of arterial blood and pH (pHa) using an extracorporeal blood circulation under conditions of normoxia and graded hypoxia [water was lowered from 20.0 kPa to 5.3 kPa within 20 min].<\/jats:p>\n               <jats:p>During normoxia, ventilation frequency was significantly higher in the softwater trout (78\u00b14 versus 57\u00b14 breaths min-1; mean \u00b1 S.E.M.), while ventilation amplitude was similar in both groups (1.0\u20131.1 cm opercular displacement). and plasma HCO3- concentration were significantly lower in the softwater fish and the blood acid\u2013base status was characterized by a mixed respiratory alkalosis and metabolic acidosis such that blood pH was not statistically different between the two groups. CO2 excretion (2.5\u20132.8 mmol kg-1 h-1) and O2 uptake rates (2.3\u20135.1 mmol kg-1 h-1), as measured during normoxia, were unaffected by acclimation to soft water.<\/jats:p>\n               <jats:p>During hypoxia, ventilation frequency and amplitude increased in the control trout, whereas only ventilation amplitude increased in the softwater-acclimated fish. The rate of reduction during hypoxia was significantly greater in the softwater fish (0.84\u00b10.06 versus 0.65\u00b10.06 kPa kPa-1 ) and, at the most severe level of hypoxia , was significantly lower in the softwater fish. The rate of reduction (caused by hyperventilation) was significantly lower in the softwater-acclimated fish (0.002\u00b10.001 versus 0.005\u00b10.001 kPa kPa-1 ; mean \u00b1 S.E.M.; P&amp;lt;0.06) and, indeed, was not statistically different from zero. Blood pH did not change significantly during hypoxia in either group but, through much of the hypoxic period (7\u201315 kPa ), pHa was statistically lower in the softwater-acclimated fish.<\/jats:p>\n               <jats:p>These results demonstrate that exposure of trout to soft water for 2 weeks is associated with proliferation of lamellar CCs and impaired branchial gas transfer. Hyperventilation was identified as a compensatory physiological adjustment.<\/jats:p>","DOI":"10.1242\/jeb.198.12.2557","type":"journal-article","created":{"date-parts":[[2021,4,23]],"date-time":"2021-04-23T23:27:24Z","timestamp":1619220444000},"page":"2557-2567","source":"Crossref","is-referenced-by-count":60,"title":["The effects of softwater acclimation on respiratory gas transfer in the rainbow trout <i>Oncorhynchus mykiss<\/i>"],"prefix":"10.1242","volume":"198","author":[{"given":"Anna Maria","family":"Greco","sequence":"first","affiliation":[{"name":"University of Ottawa 1 Department of Biology , , 30 Marie Curie, Ottawa, Ontario, Canada K1N 6N5"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kathleen M.","family":"Gilmour","sequence":"additional","affiliation":[{"name":"McMaster University 2 , Department of Biology , 1280 Main Street West, Hamilton, Ontario, Canada L8S 4K1"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James C.","family":"Fenwick","sequence":"additional","affiliation":[{"name":"University of Ottawa 1 Department of Biology , , 30 Marie Curie, Ottawa, Ontario, Canada K1N 6N5"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Steve F.","family":"Perry","sequence":"additional","affiliation":[{"name":"University of Ottawa 1 Department of Biology , , 30 Marie Curie, Ottawa, Ontario, Canada K1N 6N5"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"237","published-online":{"date-parts":[[1995,12,1]]},"reference":[{"key":"2024031721112243200_JEXBIO_198_12_2557C1","doi-asserted-by":"publisher","first-page":"159","DOI":"10.1002\/jez.1402410202","article-title":"Gill morphology and sodium influx in the rainbow trout (Salmo gairdneri) acclimated to artificial freshwater environments","volume":"241","author":"Avella","year":"1987","journal-title":"J. exp. 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