Dietary inclusion of Antarctic krill meal during the finishing feed period improves health and fillet quality of Atlantic salmon (Salmo salarL.)
Open Access
- 7 April 2020
- journal article
- research article
- Published by Cambridge University Press (CUP) in British Journal of Nutrition
- Vol. 124 (4), 418-431
- https://doi.org/10.1017/s0007114520001282
Abstract
There is an urgent need to find alternative feed resources that can further substitute fishmeal in Atlantic salmon diets without compromising health and food quality, in particular during the finishing feeding period when the feed demand is highest and flesh quality effects are most significant. This study investigates efficacy of substituting a isoprotein (35 %) and isolipid (35 %) low fishmeal diet (FM, 15 %) with Antarctic krill meal (KM, 12 %) during 3 months with growing finishing 2·3 kg salmon (quadruplicate sea cages/diet). Final body weight (3·9 (se0·04) kg) was similar in the dietary groups, but the KM group had more voluminous body shape, leaner hearts and improved fillet integrity, firmness and colour. Ectopic epithelial cells and focal Ca deposits in intestine were only detected in the FM group. Transcriptome profiling by microarray of livers showed dietary effects on several immune genes, and a panel of structural genes were up-regulated in the KM group, including cadherin and connexin. Up-regulation of genes encoding myosin heavy chain proteins was the main finding in skeletal muscle. Morphology examination by scanning electron microscopy and secondary structure by Fourier transform IR spectroscopy revealed more ordered and stable collagen architecture of the KM group. NEFA composition of skeletal muscle indicated altered metabolism ofn-3,n-6 and SFA of the KM group. The results demonstrated that improved health and meat quality in Atlantic salmon fed krill meal were associated with up-regulation of immune genes, proteins defining muscle properties and genes involved in cell contacts and adhesion, altered fatty acid metabolism and fat deposition, and improved gut health and collagen structure.Keywords
This publication has 49 references indexed in Scilit:
- The Antarctic Krill Euphausia superba Shows Diurnal Cycles of Transcription under Natural ConditionsPLOS ONE, 2013
- Making Muscle Elastic: The Structural Basis of Myomesin StretchingPLoS Biology, 2012
- Differential Effects of Krill Oil and Fish Oil on the Hepatic Transcriptome in MiceFrontiers in Genetics, 2011
- High inclusion of partially deshelled and whole krill meals in diets for Atlantic salmon (Salmo salar)Aquaculture, 2010
- Glycation Isotopic Labeling with 13C-Reducing Sugars for Quantitative Analysis of Glycated Proteins in Human PlasmaMolecular & Cellular Proteomics, 2010
- Krill for Human Consumption: Nutritional Value and Potential Health BenefitsNutrition Reviews, 2007
- Astaxanthin digestibility as affected by ration levels for Atlantic salmon, Salmo salarAquaculture, 2006
- Muscle fibre density in relation to the colour and texture of smoked Atlantic salmon (Salmo salar L.)Aquaculture, 2000
- Effects of initial weight and genetic strain on feed training largemouth bass Micropterus salmoides using ground fish flesh and freeze dried krill as starter dietsAquaculture, 1997
- Krill as a potential feed source for salmonidsAquaculture, 1988