Genetic parameter estimations of new traits of morphological quality on gilthead seabream (Sparus aurata) by using IMAFISH_ML software

In this study, a total of 18 novel productive traits, three related to carcass [cNiT] and fifteen related to morphometric [mNiT]), were measured in gilthead seabream (Sparus aurata) using Non-invasive Technologies (NiT) as implemented in IMAFISH_ML (MatLab script). Their potential to be used in industrial breeding programs were evaluated in 2348 offspring reared under different production systems (estuarine ponds, oceanic cage, inland tank) at harvest. All animals were photographed, and digitally measured and main genetic parameters were estimated. Heritability for growth traits was medium (0.25–0.37) whereas for NiT traits medium-high (0.24–0.61). In general, genetic correlations between mNiT, cNiT and growth and traits were high and positive. Image analysis artifacts such as fin unfold or shades, that may interfere in the precision of some digital measurements, were discarded as a major bias factor since heritability of NiT traits after correcting them were no significantly different from original ones. Indirect selection of growth traits through NiT traits produced a better predicted response than directly measuring Body Weight (13–23%), demonstrating that this methodological approach is highly cost-effective in terms of accuracy and data processing time.Versión del edito

Selection for growth is associated in gilthead sea bream (Sparus aurata) with diet flexibility, changes in growth patterns and higher 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 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.Versión del editor2,04

Publicaciones del Instituto de Biología Aplicada. Tomos 52-53

[Tomo 52] María del Pilar Gracia. — Contribución al estudio de las tecamebas amebas (Protozoa, Thecamoeboidea). Tecamebas esfagnícolas de la Península Ibérica. Enrique Gadea. — Algunas consideraciones sobre el poblamiento nematódico muscícola de Menorca. F. Español.—Notas sobre anóbidos (col.). Manuel González. — Contribución al conocimiento de los curculiónidos del Mediterráneo occidental. - XII. Los Barynotus ibéricos. María Concepción Rigau y Miguel Berbel. — Correlaciones de los pigmentos foliares con el crecimiento y la producción. - II. Estudio de las correlaciones existentes entre los pigmentos clorofila a y carotinoide y la producción en Lolium perenne L. Alejandro Palomo González. — Sobre alguno-; nematodos muscícolas de la zona de Ledesma (prov. Salamanca). Javier Fernández Casas. — Gypsophila niontserratii, nueva especie del Sur de España. Linnavuori. — A new species of the genus CompsidoIon Rt. (Het. Miridae) from Spain. Carmen Bach-Piella. — Tisanuros de la fauna española. Nota sobre Machilidae de Marchagaz (Cáceres).[Tomo 53] María del Pilar Gracia. — Tecamebas muscícolas de la Península Ibérica. A. Casinos. — Algunas consideraciones sobre la anatomía funcional del cráneo de los teleósteos. M. Dolores Romero Duque. — Algunos focos de infección de Heterodera schachtii Schmidt (Nematoda) en remolacha, en la región española de Levante. Enrique Gadea. — Algunas consideraciones en torno a la nematofauna muscícola de la isla de Zákynthos (Grecia). C. Altimira. — Notas malacológicas. J. Nadal. — Efecto del tiofosfato de 0-0 dimetilo y 0-(metilo-3 metil tio-4 fenilo) sobre una población Chlidonias hybrida (Pall) en La Encañizada (provincia de Tarragona). J. Gosálbez. — Primer coloquio sobre Mastozoología Ibérica. F. Español. — Notas sobre anóbidos (Col.). Carmen Bach Piella. — Sobre algunos caracteres faunísticos y ecológicos de los Machiladae de la Cordillera Central y provincia de Salamanca. J. Andrés. — Variaciones cronológicas de la intensidad del crecimiento longitudinal en plantas de maíz y avena.Peer reviewe

Selection for growth is associated in gilthead sea bream (Sparus aurata) with diet flexibility, changes in growth patterns and higher 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

Mejora de la competitividad del sector de la dorada (Sparus aurata) a través de la selección genética. PNA PROGENSA-III

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 selectionCon 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