caa a22 4500 477117260 CHVBK 20180405111626.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF01875581 doi (NATIONALLICENCE)springer-10.1007/BF01875581 Cortisol-induced changes in oxygen consumption and ionic regulation in coastal cutthroat trout ( Oncorhynchus clarki clarki ) parr [Elektronische Daten] [John Morgan, George Iwama] The influence of cortisol on oxygen consumption and osmoregulatory variables was examined in coastal cutthroat trout (Oncorhynchus clarki clarki) parr kept in fresh water (FW) and transferred to seawater (SW). Intraperitoneal implants containing cortisol (50 μg g−1) in vegetable oil resulted in elevated plasma cortisol titres similar to those observed in fish following a 24h SW exposure. Cortisol treatment significantly increased the oxygen consumption and plasma glucose levels of trout in FW, consistent with the glucocorticoid role of cortisol. Cortisol treatment did not cause any changes in plasma ion concentrations or gill Na+,K+-ATPase activity in FW after 10 days. Cortisol-implanted fish exposed to SW for 24h showed slightly improved ion regulatory ability compare to non-implanted controls. The results of this study suggest that during SW transfer in juvenile salmonids, increases in cortisol may act as both a mineralocorticoid and a glucocorticoid, depending on the developmental state of the fish (e.g., smolt versus parr). Furthermore, the relative energetic costs of osmoregulation and that of the stress associated SW transfer cannot be discerned using whole-animal oxygen consumption rates. Kugler Publication, 1996 cortisol nationallicence oxygen consumption nationallicence salinity stress nationallicence ion regulation nationallicence gill Na+ nationallicence K+-ATPase nationallicence plasma glucose nationallicence cutthroat trout parr nationallicence Morgan John Department of Animal Science, University of British Columbia, 248-2357 Main Mall, V6T 1Z4, Vancouver, B.C., Canada aut Iwama George Department of Animal Science, University of British Columbia, 248-2357 Main Mall, V6T 1Z4, Vancouver, B.C., Canada aut Fish Physiology and Biochemistry Kluwer Academic Publishers 15/5(1996-11-01), 385-394 0920-1742 15:5<385 1996 15 10695 https://doi.org/10.1007/BF01875581 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01875581 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Morgan John Department of Animal Science, University of British Columbia, 248-2357 Main Mall, V6T 1Z4, Vancouver, B.C., Canada aut NATIONALLICENCE 700 1- Iwama George Department of Animal Science, University of British Columbia, 248-2357 Main Mall, V6T 1Z4, Vancouver, B.C., Canada aut NATIONALLICENCE 773 0- Fish Physiology and Biochemistry Kluwer Academic Publishers 15/5(1996-11-01), 385-394 0920-1742 15:5<385 1996 15 10695 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer