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Visar resultat 1 - 5 av 11 uppsatser som matchar ovanstående sökkriterier.
1. Replacement of fish protein in fish feed : effects on the yeast flora in the gut of Arctic charr (Salvelinus alpinus)
Master-uppsats, SLU/Dept. of Animal Nutrition and ManagementSammanfattning : The aim with this study was to investigate how feeds with different protein sources influence the levels and composition of the yeast flora in the gut of Arctic charr (Salvelinus alpinus). Arctic charr were fed for two weeks on a control diet (C) with fishmeal (FM) or experimental diets with 40% FM replaced by yeast (Saccharomyces cerevisiae) (Y), meal from blue mussel (Mytilus edulis) (M) or a feed with Baltic Sea originated protein; 33% FM, 33% mussel meal (MM) and 33% S. LÄS MER
2. Associations between body size polymorphism in Arctic charr and benthic invertebrate communities – clues to mechanisms for population differentiation?
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : Many fish populations in the north have divided into coexisting ecotypes that differ in body size. While such polymorphic fish populations have been studied for many years, the understanding of how different types of selection contribute to the formation of dwarf- and giant ecotypes remains limited. LÄS MER
3. Aquaculture and its effect on the wild fish resource in a Swedish lake : An evaluation of changes in fat content, protein content and trophic niche
Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental StudiesSammanfattning : Fish is nutritious and important as a food source for many people. It contains high levels of protein, important omega-3 fatty acids as well as micronutrients. For a sustainable fish consumption, aquaculture is needed but it can affect nearby ecosystems in many ways. LÄS MER
4. Fönsteruttag som verktyg i bevarandet av vätternrödingen (Salvelinus alpinus)
Kandidat-uppsats, Högskolan i Skövde/Institutionen för biovetenskapSammanfattning : Vättern är Europas femte största sjö och har en unik kallvattenekologi, här finns Europas viktigaste bestånd av röding (Salvelinus alpinus). Historiskt fiskades rödingen i hårt i Vättern med fångster på upp till 70 ton per år i mitten av 1900-talet, fångsten minskade sedan successivt tills den 2009 endast uppnådde 3 ton. LÄS MER
5. Konkurrensen mellan röding, sik och lake i Vättern : En djupdykning i tre konsumenters födopreferenser. Två tidsperioder: 1964-1978 samt 2006-2011
Kandidat-uppsats, Högskolan i Skövde/Institutionen för biovetenskapSammanfattning : Lake Vättern contains Swedens most valuable population of arctic charr (Salvelinus umbla). The stock of this Salmonidae fish showed a negative trend for several decades but has now turned to a more positive one. LÄS MER
