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Liver shade linked to lumpfish welfare

3 June 2020, at 10:26am

LOLS10在线直播下注A new study has revealed a key link between liver colour and welfare levels in lumpfish.

The authors of the study hope that it will help improve the welfare of lumpfish used by the salmon aquaculture industry
The authors of the study hope that it will help improve the welfare of lumpfish used by the salmon aquaculture industry

© Ocean Matters

The – led by Stirling’s and Faroese research institute Fiskaaling – found that liver colour is an important indicator of general welfare in lumpfish, which are increasingly being used by the salmon industry to naturally remove parasites.

The research – published in Nature Scientific Reports – identified correlations between liver colour and the nutritional, welfare and health status of the species, as well as other commonly used indices including fin damage and skin lesions.

The team sampled lumpfish for welfare indicators, liver colour and stomach contents, and collected lumpfish liver samples, at a number of sea farms. Posterior nutritional and histopathological analysis of the samples was carried out at the Institute of Aquaculture.

, who led the LOLS10在线直播下注 of Stirling’s contribution to the study, said: “Our study found that lumpfish are predominantly generalists and opportunistic feeders when in cages – and this is impacting on their health and welfare.

“We were able to identify different liver colours that correlate with their health and welfare status. This technique could be used by the industry to identify any issues, and to modify husbandry and feeding – such as supplementing lumpfish feeds with essential nutrients and pigments, as necessary.

“Ultimately, this study will help to improve the development of the fish in hatcheries and when they are deployed in sea farms with the salmon – which is important because their welfare must be maintained to enable them to remain efficient and eat the sea lice from salmon.”

Collaboration

The project was conducted in the Faroe Islands, in collaboration with Dr Kirstin Eliasen, of Fiskaaling, and Esbern Patursson, of salmon farming company Hiddenfjord. Stirling masters student Enrique Pino Martinez, and Institute of Aquaculture staff Dr Monica Betancor, Dr Johanna Baily, Dr Bruce McAdam, and Dr Bernat Morro Cortes also provided support.

The study – – was funded by Fiskaaling, HiddenFjord, the Fisheries Society of the British Isles, and the Scottish Aquaculture Innovation Centre.