| Summary: | English summary Good health and welfare of farmed fish is crucial for further growth and development of the fish farming industry in Norway and abroad. Systematic work is being done at all levels of the industry with measures that can improve the health and welfare of farmed fish, but there are still some challenges that have not yet been resolved. One of these challenges is nephrocalcinosis or kidney stones. In Norway, it is reported that this, together with hemorrhagic smolt syndrome (HSS), are the most common causes of mortality in hatcheries, before the fish are transferred to sea. Nephrocalcinosis is not common in wild fish, and there is a common consensus that nephrocalcinosis is a production disorder among both fish health personnel, operational personnel and managers, and the research community. The main aim of this project was therefore to first study the prevalence and severity of nephrocalcinosis in farmed salmon and then look at the health and welfare effects of the production disorder. Since previous studies and experience from the industry have pointed to the tank environment as a risk factor for developing nephrocalcinosis, it was important to investigate the extent to which the condition was linked to various environmental factors. By identifying risk factors linked to the development of nephrocalcinosis, measures can be introduced to prevent or reverse the development of the production disorder and thus contribute to increased health and welfare in farmed fish. Norsk sammendrag God helse og velferd hos oppdrettsfisk er avgjørende for videre vekst og utvikling av oppdrettsnæringen i Norge og utlandet. Det jobbes systematisk i alle ledd i næringen med tiltak som kan bedre helse og velferd hos oppdrettsfisken, men det er likevel noen utfordringer som ikke er løst. En av disse utfordringene er nefrokalsinose eller nyrestein. I Norge rapporteres det om at dette, sammen med hemorragisk smoltsyndrom (HSS) er vanligste årsakene til dødelighet i settefiskfasen, før fisken flyttes over i sjø. ...
|
|---|