New aquaculture research from the University of Stirling reveals larval salmon lice secrete unique proteins, which could offer new pathways for improved parasite control in salmon farming.
Conducted by researchers at the University of Stirling’s Institute of Aquaculture in collaboration with the Moredun Research Institute, the work identifies key biological differences that could inform more effective parasite control strategies in aquaculture.
“Because this is the very first stage of this parasite’s life cycle, it represents a vital linchpin in control strategies for this species,” said Alexander Dindial, lead researcher.
”This work better helps us understand salmon louse biology and could play a vital role in informing future research into control of this parasite, such as through the identification of vaccine targets, which ultimately promote the sustainable production of healthy salmon and enhance global food security.”
Understanding infection
The first-of-its-kind study analysed secretions from larval and adult salmon lice to understand how early-stage parasites infect hosts.
Focusing on the infectious larval stage, known as copepodids, researchers identified 143 secretory proteins absent in adult lice.
These proteins are believed to help parasites evade host immune responses and establish infection in salmon farming environments, where infestations cost the sector more than GB£1bn annually.
The study used advanced liquid chromatography tandem mass spectrometry to analyse protein compositions after incubating larval lice in controlled seawater solutions, including exposure to isophorone, a compound naturally found in Atlantic salmon mucus.
This approach enabled precise identification of secretory proteins linked to early infection mechanisms.
Findings suggest these proteins could serve as targets for vaccine development, offering a more sustainable approach to parasite control compared with existing treatments, which are often costly, inconsistent and raise environmental and animal welfare concerns.
It’s hoped the research could have far reaching implications for improving fish health, reducing economic losses and supporting more sustainable salmon farming practices going forward.
