Genetisk variasjon i motstandskraft hos laks mot
            <i>Gyrodactylus salaris</i>

Gjerde, Bjarne; Jacq, Céleste; Aslam, Muhammed Luqman; Hindar, Kjetil; Bentsen, Hans B.

doi:10.18261/naturen.146.5.2

Cited by 2 publications

(2 citation statements)

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“…In most affected Norwegian rivers, a proportion of the young salmon survive the parasite attacks, on average 14% (Johnsen et al, 1999). In a laboratory transmission experiment, Gjerde et al (2022) documented genetic variation in resistance against G. salaris between infected and uninfected Norwegian salmon populations. As natural selection against the parasite will take a long time, it is therefore argued that the process can be accelerated through targeted breeding (Gjerde et al, 2022;Salte et al, 2010).…”

Section: Alternative S Tr Ateg Ie S To Er Adic Ation Of G Sal Arismentioning

confidence: 99%

“…In a laboratory transmission experiment, Gjerde et al (2022) documented genetic variation in resistance against G. salaris between infected and uninfected Norwegian salmon populations. As natural selection against the parasite will take a long time, it is therefore argued that the process can be accelerated through targeted breeding (Gjerde et al, 2022;Salte et al, 2010). An expert group concluded that "there is a genetic basis for developing resistance against G. salaris in Norwegian Atlantic salmon, but the timeframe to obtain a resistance to maintain viable populations would probably be on the order of hundreds of years or longer.…”

Section: Alternative S Tr Ateg Ie S To Er Adic Ation Of G Sal Arismentioning

confidence: 99%

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The battle against the introduced pathogenic monogeneanGyrodactylus salarisin Norwegian Atlantic salmon rivers and fish farms

2024

Journal of Fish Diseases

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The introduced salmonid ectoparasite Gyrodactylus salaris has been detected on Atlantic salmon in 53 Norwegian rivers and in 39 Norwegian fish farms. In affected rivers, the mortality of Atlantic salmon juveniles is very high, estimated to a mean of 86%. G. salaris has been considered one of the biggest threats to wild Norwegian Atlantic salmon stocks. With various measures, the authorities have reduced the potential for further spread of the parasite to new rivers and fish farms, and G. salaris has been eradicated from 43 rivers and all fish farms. Furthermore, the eradication process is almost completed in five affected rivers located at the Norwegian west coast, while preparations for the eradication in the remaining five rivers in the southeastern part of Norway have begun. The goal of Norwegian management is to eradicate the introduced pathogenic G. salaris strains from all occurrences in Norway. In fish farms, the parasite has been removed by mandatory slaughter of infected fish. In rivers, G. salaris has mostly been removed by killing all the fish hosts with rotenone. The indigenous genetic Atlantic salmon stocks are re‐established after eradication of the parasite. New methods are developed using chemicals that kill the parasite without killing fish in the rivers. Norwegian authorities have so far used more than NOK 1.5 billion on research, monitoring and combating G. salaris. However, the benefits are considered many times greater than the spending. Without control measures, G. salaris would likely have spread to new Atlantic salmon rivers where the same catastrophic outcome had to be expected. The Norwegian authorities seem to meet the goal in their long‐term work to halt the spread of G. salaris and to eradicate the parasite in affected rivers.

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Section: Alternative S Tr Ateg Ie S To Er Adic Ation Of G Sal Arismentioning

confidence: 99%