Influence of feed ration size on somatic and muscle growth in landlocked dwarf and farmed Atlantic salmon Salmo salar

Journal of Fish Biology
Øivind AndersenIan A Johnston

Abstract

We examined the possible adaptation of the dwarf Bleke population of Atlantic salmon Salmo salar from Lake Byglandsfjord in southern Norway to limited food resources. The growth performance and muscle development in juvenile Bleke and farmed S. salar under satiated or restricted (50%) feeding were examined for 10 months, starting 3 weeks after first-feeding stage. Four-thousand fish were divided into four replicated groups and random samples of 16-40 fish per group were measured six times during the experiment. The two strains showed no significant difference in mean body mass when fed restricted ration, but the individual variation was considerably higher in the farmed fish. Both Bleke and farmed S. salar grew significantly faster when fed to satiation, but the farmed S. salar showed much higher gain in mass and were three times heavier (201.5 g vs 66.7 g) and possessed twice as many fast muscle fibres (179,682 vs 84,779) compared with landlocked S. salar after 10 months. Farmed fish fed full ration displayed both hypertrophic and hyperplasic muscle growth, while the increased growth in Bleke S. salar was entirely associated with a larger fibre diameter. The landlocked Bleke strain has apparently adapted to low food availabili...Continue Reading

References

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Sep 28, 2000·Proceedings. Biological Sciences·I A FlemingA Lamberg
Jun 24, 2003·The Journal of Experimental Biology·Ian A JohnstonTheodore Garland
Nov 24, 2004·The Journal of Experimental Biology·Ian A JohnstonSkúli Skúlason
Dec 7, 2006·Biology Letters·Ian A JohnstonØivind Andersen
Jun 14, 2008·Public Health Nutrition·M SaelandA Oshaug
Jun 8, 2010·Genetics, Selection, Evolution : GSE·Matthew BaranskiDag Inge Våge
Apr 29, 2011·The Journal of Experimental Biology·Ian A JohnstonDaniel J Macqueen
Jan 13, 2012·Proceedings. Biological Sciences·Ian A JohnstonMichael A Bell
Jul 16, 2013·Nature Communications·Ana Gabriela JimenezStephen T Kinsey
Sep 11, 2013·General and Comparative Endocrinology·Jean-Charles GabillardIban Seiliez
Jul 8, 2015·Biochemical and Biophysical Research Communications·A RetamalesJ A Valdés

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