My work is connected to the Sea Lice Research Center at UiB within the Fish Health Group.

I have a lot of experience with molecular biology and genetics of salmon lice, identifying new gene functions (1, 2), and identifying the reaction of lice to their environment, like heat or reduced salinity. I have employed RNA-Sequencing to analyse gene expression of salmon lice and their salmon hosts.

Previously taught:

BIF210 - Molecular Biology Methods

BIO103 - Cell Biology and Genetics - Zoology part

Academic article

• Aina-Cathrine Øvergård; Christiane Eichner; Noelia Nuñez-Ortiz et al. (2023). Transcriptomic and targeted immune transcript analyses confirm localized skin immune responses in Atlantic salmon towards the salmon louse. (external link)
• Andreas Borchel; Erna Irene Heggland; Frank Nilsen (2023). Without a pinch of salt: effect of low salinity on eggs and nauplii of the salmon louse (Lepeophtheirus salmonis). (external link)
• Andreas Borchel; Marieke Verleih; Carsten Kühn et al. (2019). Evolutionary expression differences of creatine synthesis-related genes: Implications for skeletal muscle metabolism in fish. (external link)
• Andreas Borchel; Anna Zofia Komisarczuk; Alexander Rebl et al. (2017). Systematic identification and characterization of stress-inducible heat shock proteins (HSPs) in the salmon louse (Lepeophtheirus salmonis). (external link)
• Aina-Cathrine Øvergård; Andreas Borchel; Christiane Eichner et al. (2025). The generalist Caligus elongatus is better at dampening the Atlantic salmon immune response than the salmonid specialist Lepeophtheirus salmonis. (external link)
• Andreas Borchel; Frank Nilsen (2018). A novel gene‐family involved in spermatophore generation in the economically important salmon louse Lepeophtheirus salmonis. (external link)
• Alexander Rebl; Manuela Zebunke; Andreas Borchel et al. (2017). Microarray-predicted marker genes and molecular pathways indicating crowding stress in rainbow trout (Oncorhynchus mykiss). (external link)
• Andreas Borchel; Frank Nilsen (2025). Transcriptomic insights into the low-salinity tolerance of the sea louse Caligus elongatus. (external link)
• Andreas Borchel; Christiane Eichner; Aina-Cathrine Øvergård (2023). Mining Lepeophtheirus salmonis RNA-Seq data for qPCR reference genes and their application in Caligus elongatus. (external link)
• Andreas Borchel; Marieke Verleih; Alexander Rebl et al. (2017). Identification of genes involved in cold-shock response in rainbow trout (Oncorhynchus mykiss). (external link)
• Andreas Borchel; Anna Zofia Komisarczuk; Frank Nilsen (2022). Sex differences in the early life stages of the salmon louse Lepeophtheirus salmonis (Copepoda: Caligidae). (external link)
• Andreas Brietzke; Andreas Borchel; Simone Altmann et al. (2016). Transcriptome sequencing of maraena whitefish (Coregonus maraena). (external link)
• Andreas Borchel; Heidi Kongshaug; Frank Nilsen (2019). Identification and Description of the Key Molecular Components of the Egg Strings of the Salmon Louse (Lepeophtheirus salmonis). (external link)
• Marieke Verleih; Andreas Borchel; Alexander Rebl et al. (2019). A molecular survey of programmed cell death in rainbow trout: Structural and functional specifications of apoptotic key molecules. (external link)
• Helena Marie Doherty Midtbø; Christiane Eichner; Lars Are Hamre et al. (2024). Salmon louse labial gland enzymes: implications for host settlement and immune modulation. (external link)
• Helena Marie Doherty Midtbø; Andreas Borchel; Hugh Craig Morton et al. (2024). Cell death induced by Lepeophtheirus salmonis labial gland protein 3 in salmonid fish leukocytes: A mechanism for disabling host immune responses. (external link)
• Alexander Rebl; Tomáš Korytář; Andreas Borchel et al. (2020). The synergistic interaction of thermal stress coupled with overstocking strongly modulates the transcriptomic activity and immune capacity of rainbow trout (Oncorhynchus mykiss). (external link)
• Andreas Borchel; Erna Irene Heggland; Frank Nilsen (2021). The transcriptomic response of adult salmon lice (Lepeophtheirus salmonis) to reduced salinity. (external link)

Lecture

• Andreas Borchel; Helena Marie Doherty Midtbø; Aina-Cathrine Øvergård (2025). Lokal transkripsjonsregulering i lakseskinn som respons på forskjellige livsstadier av lakselus. (external link)
• Patrick Alexander Nelson; Andreas Borchel; Aina-Cathrine Øvergård (2025). Utvikling av en DNA-vaksine rettet mot lakselusspytt i Atlanterhavslaks. (external link)
• Andreas Borchel; Frank Nilsen (2017). Understanding male reproduction in sea lice. (external link)
• Andreas Borchel; Heidi Kongshaug; Frank Nilsen (2019). Main components of the egg strings of salmon lice. (external link)
• Aina-Cathrine Øvergård; Andreas Borchel (2024). Utvikling av DNA vaksine rettet mot lakselusspytt i Atlanterhavslaks. (external link)

Conference poster

• Ingeborg Emilie Berg Kahrs; Andreas Borchel; Patrick Alexander Nelson et al. (2025). Polyvalent DNA vaccines targeting salmon louse labial gland proteins. (external link)
• Andreas Borchel; Helena Marie Doherty Midtbø; Aina-Cathrine Øvergård (2025). The local transcriptomic response of Atlantic salmon skin to salmon louse chalimi and adults. (external link)

Conference lecture

• Andreas Borchel; Frank Nilsen (2018). Sex in salmon lice (Lepeophtheirus salmonis). (external link)
• Andreas Borchel (2018). Sex determination and reproduction in the sea louse – the biggest enemy of salmon farming. (external link)
• Andreas Borchel; Frank Nilsen (2022). Molekylære tilpasningsmekanismer av lakselus til brakk- og ferskvann. (external link)
• Andreas Borchel; Frank Nilsen (2017). Characterization of genes involved in the male reproductive system of salmon louse (Lepeophtheirus salmonis). (external link)
• Andreas Borchel; Frank Nilsen (2022). Molecular responses of salmon lice to reduced salinity. (external link)

Conference abstract

• Helena Marie Doherty Midtbø; Gyri Teien Haugland; Andreas Borchel et al. (2023). LsLGP3 from Salmon Louse (Lepeophtheirus salmonis) Causes Cell Death in Atlantic salmon (Salmo salar) Leukocytes. (external link)

Academic literature review

• Andreas Borchel; Frank Nilsen (2025). A Review of the Salmon Louse (Lepeophtheirus salmonis) Hyposalinity Responses and the Efficacy of Freshwater Delousing. (external link)

See a complete overview of publications in Cristin.

I am currently working on the FHF-funded project SaliFilaVax the successor of, Salivax, in which we try to develop and optimise a DNA vaccine targeting the proteins secreted from the salmon louse onto the fish.

Nanolus is led by Marineholem RASLab AS and is analysing the suitability of ion-modified water as an anti-louse treatment. I'm the project reponsible at UiB and will perform transcriptomic studies on lice treated with this water.

I was also involved in the Microboost project, which is funded by the EEA and Norway Grants and is a cooperation with several portuguese partners. In this project we try to use microalgae as functional food ingredient to improve the immune system of fish and prevent lice infestation.

Previously I have worked on the projects Freshnet and Freshnet 2 where we looked at the osmoregulation of salmon lice. Additionally I was involved in the project ModuLus which analysed the interaction of salmon lice and their hosts.