biostudies-literatureJonassen TMNorges forskningsrådNorwegian Seafood Research Fund3114https://www.ebi.ac.uk/biostudies/studies/S-EPMC11545186biostudies-literatureUnknown14(21)The aim of this study was to build on the work already conducted in optimising lumpfish broodstock temperature, photoperiod and nutrition by providing vital information on the stress relationship between mucosal barrier functions and the sexual development of lumpfish broodstock. From a population of approx. 300 fish of 1587 g (SEM ± 704 g), a sub-population of 20 fish was injected with 30 mg/kg fish cortisol implants on 5 January 2018. The control group was not treated with implants. The stress-induced cortisol implant group showed elevated plasma cortisol over a period of approximately one month. Analyses of mucus cell area and density suggested that induced stress could produce a positive functional response (stimulus) in lumpfish early in the experiment through a gentle increase in theAnimals : an open access journal from MDPIThe Effect of Stress on the Skin Welfare of Lumpfish (<i>Cyclopterus lumpus</i> Linnaeus, 1758) Broodstock.PMC11545186901798269043Jonassen TMPittman KImsland AKDfalseThe Effect of Stress on the Skin Welfare of Lumpfish (<i>Cyclopterus lumpus</i> Linnaeus, 1758) Broodstock.The aim of this study was to build on the work already conducted in optimising lumpfish broodstock temperature, photoperiod and nutrition by providing vital information on the stress relationship between mucosal barrier functions and the sexual development of lumpfish broodstock. From a population of approx. 300 fish of 1587 g (SEM ± 704 g), a sub-population of 20 fish was injected with 30 mg/kg fish cortisol implants on 5 January 2018. The control group was not treated with implants. The stress-induced cortisol implant group showed elevated plasma cortisol over a period of approximately one month. Analyses of mucus cell area and density suggested that induced stress could produce a positive functional response (stimulus) in lumpfish early in the experiment through a gentle increase in the2024-01-01T00:00:00Z2024 Oct2025-04-04T00:38:42.516Z2025-04-04T00:38:42.516ZS-EPMC115451863951883710.3390/ani14213114