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Genetic (co)variation in skin pigmentation patterns and growth in rainbow trout

Published online by Cambridge University Press:  07 August 2018

F. H. Rodríguez ,
G. Cáceres ,
J. P. Lhorente ,
S. Newman ,
R. Bangera ,
T. Tadich ,
R. Neira  and
J. M. Yáñez Open the ORCID record for J. M. Yáñez [Opens in a new window]
F. H. Rodríguez
Affiliation:
Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santa Rosa 11735, La Pintana, Santiago, Chile Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional del Altiplano, Av. Floral 1153, Puno 21001, Peru
G. Cáceres
Affiliation:
Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santa Rosa 11735, La Pintana, Santiago, Chile
J. P. Lhorente
Affiliation:
Aquainnovo S.A., Cardonal s/n, Puerto Montt 5480000, Chile
S. Newman
Affiliation:
Genus plc, 100 Bluegrass Commons Blvd. Suite 2200, Hendersonville, NC 37075, USA
R. Bangera
Affiliation:
Akvaforsk Genetics, 6600 Sunndalsora, Norway
T. Tadich
Affiliation:
Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santa Rosa 11735, La Pintana, Santiago, Chile
R. Neira
Affiliation:
Facultad de Ciencias Agronómicas, Universidad de Chile, Santa Rosa 11315, La Pintana, Santiago, Chile
J. M. Yáñez*
Affiliation:
Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santa Rosa 11735, La Pintana, Santiago, Chile Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional del Altiplano, Av. Floral 1153, Puno 21001, Peru Núcleo Milenio INVASAL, Concepción 4030000, Chile
*
†E-mail: [email protected]
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Abstract

From a physiological-behavioral perspective, it has been shown that fish with a higher density of black eumelanin spots are more dominant, less sensitive to stress, have higher feed intake, better feed efficiency and therefore are larger in size. Thus, we hypothesized that genetic (co)variation between skin pigmentation patterns and growth exists and it is advantageous in rainbow trout. The objective of this study was to determine the genetic relationships between skin pigmentation patterns and BW in a breeding population of rainbow trout. We performed a genetic analysis of pigmentation traits including dorsal color (DC), lateral band (LB) intensity, amount of spotting above (SA) and below (SB) the lateral line, and BW at harvest (HW). Variance components were estimated using a multi-trait linear animal model fitted by restricted maximum likelihood. Estimated heritabilities were 0.08±0.02, 0.17±0.03, 0.44±0.04, 0.17±0.04 and 0.23±0.04 for DC, LB, SA, SB and HW, respectively. Genetic correlations between HW and skin color traits were 0.42±0.13, 0.32±0.14 and 0.25±0.11 for LB, SA and SB, respectively. These results indicate positive, but low to moderate genetic relationships between the amount of spotting and BW in rainbow trout. Thus, higher levels of spotting are genetically associated with better growth performance in this population.

Keywords

Oncorhynchus mykissharvest weightappearanceheritabilitygenetic correlation
Type
Research Article
Information
animal , Volume 13 , Issue 4 , April 2019 , pp. 675 - 682
Copyright
© The Animal Consortium 2018 

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