Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/58889
Title: Selection for growth is associated in gilthead sea bream (Sparus aurata) with diet flexibility, changes in growth patterns and higher intestine plasticity
Authors: Perera, Erick
Simo-Mirabet, Paula
Shin, Hyun Suk 
Rosell-Moll, Enrique
Naya-Catala, Fernando
de las Heras, Veronica
Antonio Martos-Sitcha, Juan
Karalazos, Vasileios
Armero, Eva
Arizcun, Marta
Chaves, Elena
Berbel, Concepcion
Manchado, Manuel
Afonso López, Juan Manuel 
Calduch-Giner, Josep
Perez-Sanchez, Jaume
UNESCO Clasification: 251092 Acuicultura marina
Keywords: Growth performance
Genetic selection
Diet flexibility
Intestinal plasticity
Plant-Based Diets, et al
Issue Date: 2019
Journal: Aquaculture 
Abstract: Farmed gilthead sea bream (Sparus aurata) is able to grow efficiently with new feed formulations based on plant ingredients. Here, two experimental diets with standard and high inclusion levels of plant ingredients were formulated to assess the suited use of plant-based diets in fish with different growth genetic backgrounds. To pursue this issue, a long-term feeding trial (12-months) was conducted with fish (17 g initial body weight) of 16 families coming from the broodstock of PROGENSA project, that were grown communally in the IATS-CSIC experimental facilities. All fish in the study (2545) were PIT-tagged, and their pedigree was re-constructed with 96% success by using a SMsa1 multiplex of 11 microsatellites, which revealed the main parents contributions of 5 females and 6 males. Each diet was randomly assigned to replicate 3000 L tanks, gathering each replicate a similar family composition through all the feeding trial. Data on growth performance highlighted a strong genetic effect on growth trajectories, associated with enhanced growth during winter in fish selected for faster growth. No main dietary effects were found on growth rates or condition factor, and regression-correlation analyses of growth rates across families on both diets suggest that genome by diet interaction was weak, while genetic variation accounted for most of the growth phenotypic variation. Hepatosomatic index (HSI) and mesenteric fat index (MSI) of five families, covering the growth variability of the population, were regulated nutritionally and genetically, but without statistically significant genome by diet interactions. Fish from faster growing families showed shorter intestines after being fed the control diet, but this phenotype was masked by the enriched plant-based diet. Collectively, the results demonstrate that selection for faster growth is associated in gilthead sea bream with different growth trajectories and a high diet flexibility and intestine plasticity.
URI: http://hdl.handle.net/10553/58889
ISSN: 0044-8486
DOI: 10.1016/j.aquaculture.2019.04.052
Source: Aquaculture [ISSN 0044-8486], v. 507, p. 349-360
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