Received: 11 May 2021
Accepted: 18 August 2021
First Online: 7 September 2021
: Sampling was conducted with the permissions of the owner of the farm of Mjóanes and the Thingvellir National Park commission. Ethics committee approvals for research projects are not required by the Icelandic regulation (Act No. 55/2013 on Animal Welfare). The rearing and the experimental work were conducted in the facilities of Hólar University College, which has an operational license under the Icelandic Aquaculture law (Law No. 71/2008): License number FE-1051 for Verið Research station. This law includes clauses of best practices for animal care and experimental work. The fish were killed according to the most careful euthanasia guidelines for salmonid fishes [CitationRef removed], and the optimal dosage for anaesthesia on 2-phenoxyethanol was adjusted to the reactions of each individual, following the recommendations of the laboratory facility. Decisions on the sample size and on the design of the common-garden experiment were made to ensure that additional studies could be conducted with data collected on the same specimens. The study conformed to the ARRIVE guidelines.
: Not applicable.
: The authors declare no competing interests.