Abstract

This study describes the effects of altered ration levels on sensory characteristics, lipid content and fatty acid composition of rainbow trout fillet. Ration levels were altered from adequate to restricted level after 0.2 and 1.0 years from hatching and from strongly restricted and restricted levels to adequate level 1.0 years from hatching. A selected and trained panel carried out descriptive sensory tests on fish fillet cross-sections. The intensity of total odour increased, and that of juiciness decreased with age, independent of ration level. Ration level had an overall effect on the total taste intensity, independent of age. Fresh odour correlated negatively to the saturated fatty acids 14:0 (r = -0.834; p < 0.001), 16:0 (r = -0.831; p < 0.001) and 18:0 (r = -0.668; p < 0.05). Trout that had their ration level altered from restricted to adequate level 1.0 years after hatching had a higher lipid content than trout having their ration level altered from adequate to restricted level after 0.2 and 1.0 years, respectively. Including fillet lipid content in the statistical model indicated that lipid is an important factor decisive for total taste and flesh texture of the trout. Fish having their ration level altered from adequate to restricted level after 0.2 years had a significantly lower condition factor than fish having it altered 1.0 years after hatching. (C) 2000 Elsevier Science Ltd. All rights reserved.

Keywords

rainbow trout; feed ration level; sensory analysis; lipid; fatty acids

Published in

Food Quality and Preference
2000, Volume: 11, number: 3, pages: 247-254
Publisher: ELSEVIER SCI LTD

SLU Authors

• Kiessling, Anders

  • Department of Aquaculture, Swedish University of Agricultural Sciences
    
  • Institute of Marine Research (IMR)

• Kiessling, Karl-Heinz

  • Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Fish and Aquacultural Science


Publication identifier

DOI: https://doi.org/10.1016/S0950-3293(99)00073-7

Permanent link to this page (URI)

https://res.slu.se/id/publ/80441