title: Upper thermal tolerance of wild-type, domesticated and growth hormone-transgenic coho salmon Oncorhynchus kisutch.
abstract: In coho salmon Oncorhynchus kisutch, no significant differences in critical thermal maximum (c. 26·9° C, CTmax ) were observed among size-matched wild-type, domesticated, growth hormone (GH)-transgenic fish fed to satiation, and GH-transgenic fish on a ration-restricted diet. Instead, GH-transgenic fish fed to satiation had significantly higher maximum heart rate and Arrhenius breakpoint temperature (mean ± s.e. = 17·3 ± 0·1° C, TAB ). These results provide insight into effects of modified growth rate on temperature tolerance in salmonids, and can be used to assess the potential ecological consequences of GH-transgenic fishes should they enter natural environments with temperatures near their thermal tolerance limits.
authors.affiliation: Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada.
authors.forename: Z
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Center for Aquaculture and Environmental Research, Fisheries and Oceans Canada, 4160 Marine Drive, West Vancouver, BC, V7V 1N6, Canada.
authors.forename: R H
authors.initials: RH
authors.lastname: Devlin
authors.affiliation: Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada.|Faculty of Land and Food Systems, University of British Columbia, 2357 Main Mall, Vancouver, BC, V6T 1Z4, Canada.
authors.forename: A P
authors.initials: AP
authors.lastname: Farrell
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified / Q000254:growth & development / Q000502:physiology*; D000835:Animals, Wild / Q000502:physiology; D049628:Body Size; D004032:Diet / Q000662:veterinary*; D005838:Genotype; D013006:Growth Hormone; D017684:Oncorhynchus kisutch / Q000254:growth & development / Q000502:physiology*; D013696:Temperature
chemical_list: D013006:Growth Hormone
keywords: Arrhenius breakpoint temperature; CTmax; ECG; heart rate; optimum temperature; restricted ration