Altintzoglou T.,Nofima Marine AS |
Nostvold B.H.,Nofima Marine AS |
Carlehog M.,Nofima Marine AS |
Heide M.,Nofima Marine AS |
And 2 more authors.
British Food Journal | Year: 2012
Purpose: The purpose of this study was to investigate the effect of information on English consumers' evaluation of fresh and thawed cod fillets which in English retail stores is referred to as "chilled" seafood. Design/methodology/approach: After the exploration of consumers' impressions of thawed fish, this study followed a pair-wise comparison approach in a central location consumer test. Fish fillets were evaluated on liking, smell and texture by means of a questionnaire with additional behavioural and attitudinal questions. Findings: This study showed that consumers in England may prefer thawed over fresh cod fillets without information. However, consumers' evaluations increased for labelled fresh cod fillets and decreased for thawed. Finally, consumers reported positive expectations about fillets labelled "fresh" or "frozen at sea". Research limitation/implications: This study involved testing cod fillets in a central location test. Consumers do not usually evaluate cod fillets in this way in their daily life. The quality of the two types of fillets made especially for this test may vary compared to the ones usually sold and consumed. Practical implications: This study can inform producers and retailers about what to expect by means of sales of fresh and thawed cod products with or without information. Social implications: It was shown that consumers are positively influenced by information and are willing to consume more fish if they know that the fish is fresh or thawed properly. Originality/value: This is the first paper to present English consumers' evaluations of thawed cod. © Emerald Group Publishing Limited.
Bazyar Lakeh A.A.,University of Tehran |
Ahmadi M.R.,University of Tehran |
Safi S.,Islamic Azad University at Tehran |
Ytrestoyl T.,Nofima Marine AS |
Bjerkeng B.,Nofima Marine AS
Journal of Applied Ichthyology | Year: 2010
Growth performance, mortality and carotenoid pigmentation were studied in triplicate groups each with 1000 swim-up larvae of rainbow trout (Oncorhynchus mykiss), derived from five groups of female broodstock fed diets with 0.07, 12.5, 33.3, 65.1 or 92.9 mg astaxanthin kg-1, respectively. The first feeding fry (initial weight range from 113 to 148 mg) were fed a diet not supplemented with carotenoids in an experiment lasting 45 days. Fry were initially sampled for astaxanthin content and initial weight, and in subsequent 15-day intervals to determine weights, condition factors (CF), specific growth rates (SGR) and thermal growth coefficients (TGC). Total carotenoid concentration of the larvae was highly linearly correlated to that of the eggs (r2 = 0.97, P = 0.002). About 59-67% of fry carotenoids consisted of esterified astaxanthin, and on average 39.7% of the egg carotenoids were recovered in the fry. Overall (0-45 days) SGRs and TGCs were significantly higher (P < 0.05) in the offspring of the four groups of females fed supplemented diets (12.5-92.9 mg astaxanthin kg-1) than in offspring of females fed the non-supplemented diet. TGCs (0-45 days) within groups derived from broodstock supplemented with astaxanthin were similar (P > 0.05), but higher than in the group derived from females fed the diet not supplemented with astaxanthin (P < 0.05). Mortality (average 0.76%) was not significantly affected by treatment. The study indicates that dietary supplement of astaxanthin (>12.5 mg kg-1) to maternal broodstock diets improves offspring SGR and TGC with up to 33 and 38%, respectively. © 2009 Blackwell Verlag GmbH.
Yazdi M.H.,Norwegian University of Life Sciences |
Sonesson A.K.,Nofima Marine AS |
Woolliams J.A.,Roslin Institute |
Meuwissen T.H.,Norwegian University of Life Sciences
Genetics Selection Evolution | Year: 2010
Background: Detecting a QTL is only the first step in genetic improvement programs. When a QTL with desirable characteristics is found, e.g. in a wild or unimproved population, it may be interesting to introgress the detected QTL into the commercial population. One approach to shorten the time needed for introgression is to combine both QTL identification and introgression, into a single step. This combines the strengths of fine mapping and backcrossing and paves the way for introgression of desirable but unknown QTL into recipient animal and plant lines. Methods. The method consisting in combining QTL mapping and gene introgression has been extended from inbred to outbred populations in which QTL allele frequencies vary both in recipient and donor lines in different scenarios and for which polygenic effects are included in order to model background genes. The effectiveness of the combined QTL detection and introgression procedure was evaluated by simulation through four backcross generations. Results: The allele substitution effect is underestimated when the favourable QTL allele is not fixed in the donor line. This underestimation is proportional to the frequency differences of the favourable QTL allele between the lines. In most scenarios, the estimates of the QTL location are unbiased and accurate. The retained donor chromosome segment and linkage drag are similar to expected values from other published studies. Conclusions: In general, our results show that it is possible to combine QTL detection and introgression even in outbred species. Separating QTL mapping and introgression processes is often thought to be longer and more costly. However, using a combined process saves at least one generation. With respect to the linkage drag and obligatory drag, the results of the combined detection and introgression scheme are very similar to those of traditional introgression schemes. © 2010 Yazdi et al; licensee BioMed Central Ltd.
Ytteborg E.,Norwegian Institute of Food |
Ytteborg E.,Norwegian University of Life Sciences |
Torgersen J.S.,Norwegian Institute of Food |
Pedersen M.E.,Nofima Food AS |
And 3 more authors.
Cell and Tissue Research | Year: 2010
Histological characterization of spinal fusions in Atlantic salmon (Salmo salar) has demonstrated shape alterations of vertebral body endplates, a reduced intervertebral space, and replacement of intervertebral cells by ectopic bone. However, the significance of the notochord during the fusion process has not been addressed. We have therefore investigated structural and cellular events in the notochord during the development of vertebral fusions. In order to induce vertebral fusions, Atlantic salmon were exposed to elevated temperatures from fertilization until they attained a size of 15 g. Based on results from radiography, intermediate and terminal stages of the fusion process were investigated by immunohistochemistry and real-time quantitative polymerase chain reaction. Examination of structural extracellular matrix proteins such as Perlecan, Aggrecan, Elastin, and Laminin revealed reduced activity and reorganization at early stages in the pathology. Staining for elastic fibers visualized a thinner elastic membrane surrounding the notochord of developing fusions, and immunohistochemistry for Perlecan showed that the notochordal sheath was stretched during fusion. These findings in the outer notochord correlated with the loss of Aggrecan- and Substance-P-positive signals and the further loss of vacuoles from the chordocytes in the central notochord. At more progressed stages of fusion, chordocytes condensed, and the expression of Aggrecan and Substance P reappeared. The hyperdense regions seem to be of importance for the formation of notochordal tissue into bone. Thus, the remodeling of notochord integrity by reduced elasticity, structural alterations, and cellular changes is probably involved in the development of vertebral fusions. © Springer-Verlag 2010.