|Author(s)||Saillant Eric1, 4, 5, Dupont-Nivet Mathilde2, Sabourault Marie5, Haffray Pierrick3, Laureau Stanislas1, Vidal Marie-Odile5, Chatain Beatrice5|
|Affiliation(s)||1 : Ecloserie Marine Gravelines, F-59820 Gravelines, France.
2 : INRA, UMR 1313, F-78350 Jouy En Josas, France.
3 : SYSAAF, Sect Aquacole, Stn SCRIBE, F-35042 Rennes, France.
4 : Univ So Mississippi, Gulf Coast Res Lab, Dept Coastal Sci, Ocean Springs, MS 39564 USA.
5 : IFREMER, Lab Rech Pisciculture Marine, F-34250 Palavas Les Flots, France.
|Source||Aquatic Living Resources (0990-7440) (EDP Sciences), 2009 , Vol. 22 , N. 1 , P. 105-112|
|WOS© Times Cited||23|
|Keyword(s)||Dicentrarchus labrax, Communal testing, Microsatellites markers, Carcass quality, Heritability|
|Abstract||Genetic parameters for carcass quality traits were estimated in 27 families of sea bass (3 dams x 9 sires factorial mating design), raised mixed in the same tanks starting before hatching. O. spring parentage was determined a posteriori using 6 microsatellite loci. Carcass quality traits were recorded at 818 days post fertilization (mean standard length: 32.6 +/- 3.1 cm). Genetic parameters were estimated from the sire half sib variance and covariance components. Heritability of body weight (BW) and carcass processing traits (standardized to body weight) percent head weight (Head%), percent viscera weight (Viscera%) and percent visceral fat weight (VisceFat%) were relatively high ranging from 0.48 +/- 0.15 (Viscera%) to 0.87 +/- 0.23 (Head%); the estimate of heritability for fillet yield (Fillet%) was lower (0.25 +/- 0.10) but was significantly greater than zero. Body weight was positively correlated to Fillet%, Viscera%, and VisceFat%, and negatively correlated to Head%. These results indicate that these carcass processing traits can be modified by directional selection and that selection for greater BW would lead to an increase of Fillet%, Viscera% and VisceFat% and a decrease of Head%. Muscle lipid content (MuscleLipid%) was determined using two indirect methods: measurements with a Torry Fish Fatmeter (R) (TorryLipid) and determination of the percentage of dry matter content (MuscleDry%) via desiccation. Both measures were highly correlated to chemical measurements of MuscleLipid%. Regression analysis indicated a superior predictive value of TorryLipid suggesting that MuscleLipid% may be evaluated via rapid, non lethal measurements with a Torry Fish Fatmeter. Heritability estimates of TorryLipid and MuscleDry% differed significantly from zero (TorryLipid: 0.28 +/- 0.12, MuscleDry%: 0.36 +/- 0.14) indicating that MuscleLipid% could be lowered by directional selection. TorryLipid and MuscleDry% were weakly correlated to body weight and carcass processing traits suggesting that simultaneous improvement of MuscleLipid% and other carcass quality traits may require definition of multi-trait selection indices.|
Saillant Eric, Dupont-Nivet Mathilde, Sabourault Marie, Haffray Pierrick, Laureau Stanislas, Vidal Marie-Odile, Chatain Beatrice (2009). Genetic variation for carcass quality traits in cultured sea bass (Dicentrarchus labrax). Aquatic Living Resources, 22(1), 105-112. Publisher's official version : https://doi.org/10.1051/alr/2009010 , Open Access version : https://archimer.ifremer.fr/doc/00000/6355/