Collected Evidence: Collected Evidence: Use of probiotics and immunostimulants One replicated study in Scotland found increased survival in salmon fed a probiotic before exposure to four different disease-causing bacteria over a 28 day period compared with controls. A replicated, controlled study in Norway found the number of salmon infected with lice was reduced by 28% when fed a diet composed of fish meal and 28% plant-based protein. Adding beta-glucans to the diet decreased lice infection levels by a further 28% compared with controls. The same study found the addition of mannan oligosaccharides improved gut function by preventing the development of soybean-induced enteritis compared with controls. Collected, 03 Jun 2013 11:14:24 +0100Collected Evidence: Collected Evidence: Use vaccinations Two controlled studies from Iceland and Norway found higher survival rates in vaccinated salmon compared to unvaccinated control groups. This was post exposure to the disease-causing bacteria, Aeromonas salmonicida spp.achromogenes and Yersinia ruckeri, respectively. Two controlled studies in Australia and Canadia reported higher survival in salmon infected with marine flexibacteriosis and bacterial kidney disease, post vaccination. Two controlled studies in Norway reported similar results for salmon vaccinated against infectious salmon anaemia. Collected, 03 Jun 2013 14:33:01 +0100Collected Evidence: Collected Evidence: Breed for resistance traits A replicated, controlled study in Norway found increased survival levels in salmon exposed to infectious pancreatic necrosis when the family was bred for high resistance to the disease compared to a family bred for low resistance to the disease. Collected, 03 Jun 2013 15:17:27 +0100Collected Evidence: Collected Evidence: Use natural control agents: cleaner wrasse Two studies in Ireland found mixed effects of cleaner wrasse on sea lice numbers infesting salmon. One controlled study found corkwing and goldskinny cleaner wrasse were as effective at controlling lice infestation as chemical treatments. One replicated, controlled study found rockcook cleaner wrasse were ineffective at preventing lice outbreaks. Collected, 03 Jun 2013 15:28:00 +0100Collected Evidence: Collected Evidence: Bathe in freshwater Two studies in Australia provide mixed evidence of the effect of freshwater bathing to reducing amoebic gill disease. One study found a reduction in numbers of amoebae on salmon gills persisting for up to 10 days after bathing. One replicated, controlled study found similar levels of amoebae in the gills of treated and untreated salmon.   Collected, 03 Jun 2013 15:31:45 +0100Collected Evidence: Collected Evidence: Aerobic training A randomised, replicated, controlled study in Norway found higher survival rates in salmon exposed to infectious pancreatic necrosis if they had undergone aerobic training. Interval training was more effective than continuous training. Collected, 03 Jun 2013 15:39:10 +0100Collected Evidence: Collected Evidence: Alter lighting A replicated, controlled study in Norway reported lower numbers of lice on salmon kept in low intensity artificial light or natural lighting. The more intense the artificial light was, the higher the number of lice found on fish. Collected, 03 Jun 2013 15:41:00 +0100Collected Evidence: Collected Evidence: Alter cage size A replicated study in Australia recorded lower levels of amoebic gill disease in salmon kept within larger compared to smaller cages. Collected, 03 Jun 2013 15:46:43 +0100Collected Evidence: Collected Evidence: Establish fallowing to reduce parasites/diseaseA study in Scotland recorded lower lice numbers on Atlantic salmon in cages using a fallowing system. Another study in Australia found no difference in mortality from Amoebic Gill Disease in cages where a fallowing system had been used.Collected, 18 Jun 2014 14:41:41 +0100
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What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

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An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

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