Papers by Margareth Øverland
Aquaculture Research, 2010
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Biology of Growing Animals, 2006
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PLoS ONE, 2013
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Journal of Agricultural and Food Chemistry, 2005
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Italian Journal of Animal Science, 2010
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Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 2013
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Journal of Animal …, 1995
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Aquaculture Nutrition, 2011
ABSTRACT The aim of the study was to investigate the effect of starch source, retention time in t... more ABSTRACT The aim of the study was to investigate the effect of starch source, retention time in the preconditioner and screw speed (RPM) on physical quality of extruded fish feeds. The experiment was arranged in a three by two by two factorial design using three carbohydrate sources [wheat starch (WS), pea starch (PS) or a combination (WS_PS)], two retention times in the preconditioner [long (120 s) or short (62 s)] and two RPM in the extruder [high (300) or low (220)]. Physical quality was assessed by hardness, diameter, expansion ratio, Holmen durability (HDI), DORIS value (DV), oil absorption capacity, oil leakage and pasting viscosity. The results showed that retention time in the preconditioner only affected HDI and oil leakage. Long retention time improved HDI but caused a greater leakage. Changing screw speed from 220 to 300 RPM gave a greater expansion ratio, improved HDI and oil absorption. PS resulted in higher pasting viscosity, HDI and DV, but a generally lower hardness than WS. To conclude, PS and WS have different processing characteristics, and the conditions need to be adjusted according to the starch source used when producing extruded fish feed.
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Aquaculture Nutrition, 2012
ABSTRACT Antarctic krill (Euphausia superba) and other marine zooplankton may contain high levels... more ABSTRACT Antarctic krill (Euphausia superba) and other marine zooplankton may contain high levels of fluoride. The aim of the present experiment was to determine whether dietary fluoride from Antarctic krill at levels similar to the old and the new EU allowable limits in fish feeds (150 and 350 mg kg-1) would induce kidney lesions in freshwater-reared Atlantic salmon (Salmo salar). In addition to the diets containing krill, two high-sodium fluoride (NaF) diets (1500 and 3500 mg kg-1) were used to investigate the effect on growth, feed intake, faecal excretion of minerals and accumulation of fluoride in various tissues. No major effects on growth or feed intake were observed. A higher proportion of the ingested fluoride was absorbed in salmon fed with the NaF diets compared with fish fed with krill shell diets. Fluoride accumulated in liver, kidney and especially bone. Faecal excretion of calcium and magnesium was higher for the NaF-fed fish compared with fish fed with the control and krill shell diets, whereas the levels of these minerals in plasma were unaffected. Dietary fluoride from krill shells did not induce kidney lesions. One-third of the salmon fed with the highest NaF diet showed signs of crystal formation within the distal tubules and/or collecting ducts in the kidney.
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Aquaculture, 2011
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Aquaculture, 2012
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Aquaculture, 2013
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Aquaculture, 2012
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Aquaculture, 2013
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Aquaculture, 2011
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Aquaculture, 2009
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Aquaculture, 2011
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Aquaculture, 2011
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Aquaculture, 2010
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Papers by Margareth Øverland