Selection for muscle fat content and triploidy affect flesh quality in pan-size rainbow trout, Oncorhynchus mykiss

Type Article
Date 2015-11
Language English
Author(s) Lefevre Florence1, Cardinal Mireille2, Bugeon Jerome1, Labbe Laurent3, Medale Francoise4, Quillet Edwige5
Affiliation(s) 1 : INRA, UR1037, Fish Physiol & Genom, F-35000 Rennes, France.
2 : IFREMER, BRM STBM, F-44311 Nantes 3, France.
3 : INRA, UE0937, PEIMA, F-29450 Sizun, France.
4 : INRA, UR1067, NuMeA, F-64310 St Pee Sur Nivelle, France.
5 : INRA, UMR1313, GABI, F-78350 Jouy En Josas, France.
Source Aquaculture (0044-8486) (Elsevier Science Bv), 2015-11 , Vol. 448 , P. 569-577
DOI 10.1016/j.aquaculture.2015.06.029
WOS© Times Cited 6
Keyword(s) Flesh quality, Lipid content, Muscle fiber, Triploid, Fish, Texture
Abstract A lean muscle line (L) and a fat muscle line (F) of rainbow trout were established (Quillet et al., 2005) by a two-way selection for muscle lipid content performed on pan-size rainbow trout using a non-destructive measurement of muscle lipid content (Distell Fish Fat Meter®). The aim of the present study was to evaluate the consequences of this selective breeding on flesh quality of pan size (290 g) diploid and triploid trout after three generations of selection. Instrumental evaluations of fillet color and pH measurement were performed at slaughter. Flesh color, pH, dry matter content and mechanical resistance were measured at 48 h and 96 h postmortem on raw and cooked flesh, respectively. A sensorial profile analysis was performed on cooked fillets. Fillets from the selected fatty muscle line (F) had a higher dry matter content and were more colorful for both raw and cooked fillets. Mechanical evaluation indicated a tendency of raw flesh from F fish to be less firm, but this was not confirmed after cooking, neither instrumentally or by sensory analysis. The sensory analysis revealed higher fat loss, higher intensity of flavor of cooked potato, higher exudation, higher moisture content and a more fatty film left on the tongue for flesh from F fish. Triploid fish had mechanically softer raw and cooked fillets, but the difference was not perceived by the sensorial panel. The sensorial evaluation also revealed a lower global intensity of odor, more exudation and a higher moisture content in the fillets from triploid fish. These differences in quality parameters among groups of fish were associated with larger white muscle fibers in F fish and in triploid fish. The data provide additional information about the relationship between muscle fat content, muscle cellularity and flesh quality.
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