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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 ge- netic 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 me- senteric fat index (MSI) of five families, covering the growth variability of the population, were regulated nu- tritionally 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.

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.

This project promotes technology developments for gilthead sea bream industrial sector of Spain, to facilitate and normalize the implementation of genetic selection schemes in this species, by defining new technological traits of commercial interest, with new standardized and extensible technological developments that permit, in an economical manner, normalized measuring methods, to study genetic parameters (growth, morphology, carcass and resistance disease), genotype-environment interaction to extend the Spanish production, and guarantee the production levels to the whole production chain. At the same time, improving the breeders management under industrial conditions, the validation of feeding efficiency during the selection processes and location of biomarkers linked and applied in genomic selection, Con la presente propuesta se pretende desarrollar metodología transferible al sector industrial de dorada en España que facilite y normalice la implementación de esquemas de selección genética en esta especie, mediante la definición de caracteres de interés comercial con nuevos desarrollos tecnológicos que estandaricen y hagan extensible a todo el sector, de manera económica, la medición de caracteres a escala industrial, el estudio de parámetros genéticos para caracteres de interés comercial (crecimiento, morfología, rendimiento y resistencia a enfermedades) en stocks de reproductores de la industria española, la estimación de la interacción genotipo-ambiente para permitir de manera garante la expansión de los rendimientos productivos de la industria Española, la gestión de reproductores bajo los propios condicionantes de la industria, así como la validación de la eficiencia alimenticia de los procesos de selección y búsqueda de biomarcadores asociados y aplicables en los modelos de selección.

[EN] This project promotes technology developments for gilthead sea bream industrial sector of Spain, to facilitate and normalize the implementation of genetic selection schemes in this species, by defining new technological traits of commercial interest, with new standardized and extensible technological developments that permit, in an economical manner, normalized measuring methods, to study genetic parameters (growth,morphology, carcass and resistance disease), genotype-environment interaction to extend the Spanish production, and guarantee the production levels to the whole production chain. At the same time, improving the breeders management under industrial conditions, the validation of feeding efficiency during the selection processes and location of biomarkers linked and applied in genomic selection., [ES] Con la presente propuesta se pretende desarrollar metodología transferible al sector industrial de dorada en España que facilite y normalice la implementación de esquemas de selección genética en esta especie, mediante la definición de caracteres de interés comercial con nuevos desarrollos tecnológicos que estandaricen y hagan extensible a todo el sector, de manera económica, la medición de caracteres a escala industrial, el estudio de parámetros genéticos para caracteres de interés comercial (crecimiento, morfología, rendimiento y resistencia a enfermedades) en stocks de reproductores de la industria española, la estimación de la interacción genotipo-ambiente para permitir de manera garante la expansión de los rendimientos productivos de la industria Española, la gestión de reproductores bajo los propios condicionantes de la industria, así como la validación de la eficiencia alimenticia de los procesos de selección y búsqueda de biomarcadores asociados y aplicables en los modelos de selección.