Dummy regression analysis for modelling the nutritionally tailored fillet fatty acid composition of turbot and sole using gilthead sea bream as a reference subgroup category

Abstract

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Comprehensive overview of feed‐to‐fillet transfer of new and traditional contaminants in Atlantic salmon and gilthead sea bream fed plant‐based diets

“…Indeed, juvenile fish of gilthead sea bream are able to grow fast and efficiently from early life stages until market size with practical diets containing <10% marine feed ingredients (Benedito‐Palos et al., ). However, carnivorous fish fed with little or no fish meal/fish oil diets have been shown to have a wide range of metabolic effects that, in addition to affecting growth performance, can also impact on health (Martin & Król, ; Torrecillas et al., ) or the nutritious value of seafood products as the most important source of omega‐3 in the human diet (Ballester‐Lozano, Benedito‐Palos, Mingarro, Navarro, & Pérez‐Sánchez, ; Ballester‐Lozano et al., ; Benedito‐Palos et al., ). The precise mechanisms for this disruption of fish health and welfare are not fully understood, although recent studies with extreme diet formulations pointed out in gilthead sea bream that dietary supplementation of plant‐based diets with sodium butyrate helps to prevent in long‐term feeding trials the inflammation of the intestinal epithelium, preserves the integrity of the intestinal barrier (Estensoro et al., ) and improves bacteria and parasite disease outcomes (Piazzon et al., , ).…”

Dietary Butyrate Helps to Restore the Intestinal Status of a Marine Teleost (Sparus aurata) Fed Extreme Diets Low in Fish Meal and Fish Oil

“…However, low fish meal (FM) inclusion levels remain associated to poor growth and survival in different fish species [8–11]. Likewise, when low fish oil (FO) inclusion levels are considered, the nutritional value of farmed fish is compromised by a low content of ω-3 long-chain polyunsaturated fatty acids [12, 13]. Thus, a better understanding of the long term physiological consequences of plant-based diets or other alternative feed ingredients is a major issue to improve aquaculture sustainability.…”

Up-scaling validation of a dummy regression approach for predictive modelling the fillet fatty acid composition of cultured European sea bass (Dicentrarchus labrax)

“…In contrast, both in this and in the previous study (Ballester‐Lozano et al . ), statistically significant interactions between fillet lipid content and fish species subgroups were found for saturated FAs (14:0, 16:0, 18:0) and monoenes (18:1n‐9, 16:1n‐7, 18:1n‐7, 20:1n‐9). Therefore, the contribution of the variable fillet lipid content is highly dependent on fish species, probably reflecting the fish species differences in tissue FA uptake and lipogenic enzyme activities, including among others the stearoyl‐CoA desaturase, evolved in teleosts as two different isoforms (Castro, Wilson, Gonçalves, Galante‐Oliveira, Rocha & Cunha ), which are highly nutritionally regulated at the transcriptional level in the skeletal muscle of gilthead sea bream (Benedito‐Palos, Calduch‐Giner, Ballester‐Lozano & Pérez Sánchez ).…”

“…Similarly, fillet FA composition of turbot and sole are also highly predictable under farming conditions (Ballester‐Lozano et al . ). Therefore, dummy regression is confirmed as a powerful multispecies tool for predictive modelling the nutritionally tailored fillet FA composition of marine fish.…”

“…This is the rationale for the multispecies predictive modelling of fillet fatty acid (FA) composition, and interestingly the robustness of linear regressions with dietary FA composition and fillet lipid content as independent variables was proven highly informative in gilthead sea bream ( Sparus aurata ) (Ballester‐Lozano, Benedito‐Palos, Navarro, Kaushik & Pérez‐Sánchez ; Benedito‐Palos, Bermejo‐Nogales, Karampatos, Ballester‐Lozano, Navarro, Diez, Bautista, Bell, Tocher, Obach, Kaushik & Pérez‐Sánchez ). What is more, a dummy regression approach with the gilthead sea bream dataset as a reference subgroup has been used by Ballester‐Lozano, Benedito‐Palos, Riaza, Navarro, Rosel and Pérez‐Sánchez () for predictive modelling the fillet FA composition in turbot ( Scophthalmus maximus ) and sole ( Solea solea ) (http://www.nutrigroup-iats.org/aquafat). One of the assumptions of dummy regression is that the contribution of each fish species to the total variance will be best estimated by pooling all the data from the different species subgroups (Kutner, Nachtsheim & Neter ).…”