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Industry Happenings


September 10, 2019

     

Scottish Sea Farms to lead second research on salmon gill health

 

 

Scottish Sea Farms will be leading a second applied research project focused on increasing understanding of gill health in farmed salmon - an effort that is part of its 'prevention over cure' approach to fish welfare, the company announced in early September.


The £601,000 (US$740,186) project - of which Scottish Sea Farms will fund 62% - will be the salmon producer's second such collaboration with academics at the University of Aberdeen, feed specialists BioMar and the Scottish Aquaculture Innovation Centre (SAIC).


Combined, the two projects bring the company's investment in applied research into gill health to almost £750,000 (US$923,779) since 2018.


Scottish Sea Farms' head of fish health, Dr Ralph Bickerdike, said: "The gills are hugely important to the overall health and well being of Atlantic salmon, yet the factors affecting these vital organs are as highly complex as they are little understood. This second gill health project seeks to explore further the early insights gleaned in our initial collaboration, helping increase knowledge of the key risks and how to pre-empt and avoid them."


The project team will focus efforts on two key outcomes: Exploring the effect of geography and seasonal influences on gill health, in order that additional preventative and continuous measures can be identified and deployed; and testing the accuracy of a range of new biomarkers - a suite of veterinary tests which help indicate the health status of fish and will enable more informed decisions.


The insights gleaned will not only benefit farmed fish in the care of Scottish Sea Farms. SAIC aquaculture innovation manager for the gill health project, Caroline Griffin, explained: "Gill health has become one of the biggest challenges facing salmon production - not only in Scotland, but in Norway and internationally. SAIC is supporting a range of projects across Scotland, drawing on the expertise in our academic institutions and industry to understand the issue and develop innovative solutions. The new knowledge gained will be shared across the sector, helping salmon farmers to maintain healthy populations of farmed fish."


One example to just how devastating gill-related challenges can be to fish health is Scottish Sea Farms' Lismore North farm in Loch Linnhe. The site experienced unusually high mortalities of 22% during the last crop as a direct result of complex gill health disorder.


Bickerdike said: "When seawater temperature rises, even by something as seemingly slight as 0.5 degrees, more marine organisms grow. In the summer of 2018 - the joint hottest summer on record for the UK - we experienced a phytoplankton bloom in the Loch Linnhe area which resulted in a challenge to gill health. Increasing our understanding of what more we can do to pre-empt and prevent these kinds of challenges is a priority."


Further fueling the drive to increase knowledge in fish health, the Lismore North farm witnessed 15% mortalities earlier in the same crop due to Saprolegnia - a health challenge which arises at freshwater stage and another area currently being researched by Scottish Sea Farms, SAIC and partners - contributing to an overall survival rate of just 59% for the total crop. This compares with survival rates in excess of 90% for the previous three crops.


"Across our farming estate, average end of crop survival is now 87.2%; a strong survival rate that has been aided by Scottish Sea Farms investing over £10 million (US$12,311,640) in applied research into fish health in the last five years alone," Bickerdike added.


"The challenges experienced at Lismore North, whilst isolated, are precisely the reason why we continue to invest and build our knowledge in order to fully deliver our 'prevention over cure' approach to fish welfare and boost survival rates even further."


- Scottish Sea Farms

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