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Title: Selection for high growth improves reproductive performance of gilthead seabream Sparus aurata under mass spawning conditions, regardless of the dietary lipid source
Authors: Ferosekhan, Shajahan
Sarih, Samira
Afonso López, Juan Manuel 
Zamorano Serrano, María Jesús 
Fontanillas, Ramón
Izquierdo López, María Soledad 
Kaushik None,Sadasivam J. 
Montero Vítores, Daniel 
UNESCO Clasification: 310502 Piscicultura
310902 Genética
Keywords: Broodstock
Fatty acids
Fish oil replacement
Rapeseed oil
Genetic selection, et al
Issue Date: 2022
Project: Genomic and nutritional innovations for genetically superior farmed fish to improve efficiency in European aquaculture 
Blue Growth Interreg MED horizontal project (2021-2022)
Mejora de la Competitividad Del Sector de la Dorada A Través de la Selección Genética (Progensa-Iii) 
Journal: Animal Reproduction Science 
Abstract: Genetic selection programmes in gilthead seabream mainly focus on traits related to growth, disease resistance, skeletal anomalies, or fillet quality. However, the effect of selection for growth on the reproductive performance of seabream broodstock has not received much attention. The present study aimed to determine the effect of selection for growth traits, high (HG) or low (LG) growth, and broodstock feeding with fish oil (FO diet) or rapeseed oil (RO diet) as main lipid sources, on reproductive performance of gilthead seabream. For the first part of the spawning season (Phase I) HG and LG broodstock were fed a commercial diet and the HG broodstock produced a higher number of larvae and higher viable eggs, hatching and larval survival rates than LG broodstock, affecting egg fatty acid profiles. For the second part of the study (Phase II) broodstock were fed one of the two diets containing FO or RO. Fecundity in terms of viable eggs, hatchlings, and larvae produced, as well as fertilization rates, were improved in HG broodstock. Some fatty acids such as 18:0, 20:2n-6, 20:3n-3 or EPA/ARA were also affected by the growth selection. According to the two-way ANOVA analysis, feeding the RO diet did not significantly affect fecundity parameters, but slightly reduced fertilization and hatching rates in HG broodstock. Nevertheless, HG broodstock showed better spawning quality parameters than LG broodstock, even when they were fed the RO diet. Egg fatty acid profiles reflected diet composition, although DHA contents were not affected. In conclusion, broodstock selected for high growth had a positive effect on broodstock performance, and FO replacement by RO did not markedly affect reproduction providing that fatty acid contents were sufficient to fulfill the essential fatty acid requirements of gilthead seabream broodstock.
ISSN: 0378-4320
DOI: 10.1016/j.anireprosci.2022.106989
Source: Animal Reproduction Science [ISSN 0378-4320], v. 241, June 2022
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