Changes in fatty acid profile and chemical composition of meagre (Argyrosomus regius) fed with different lipid and selenium levels

Abstract

This study aimed to evaluate changes in body composition, specially muscle and liver fatty acid profile in meagre (Argyrosomus regius) fed with different dietary lipid sources and levels, with or without selenium supplementation. Six hundred meagre were fed twice a day, 6 days per week, with eight experimental diets for 60 days. Diets were a combination of fish oil or a vegetable blend (45% linseed + 35% rapeseed + 20% soybean oil), at 12 or 17% of oil and 0 or 1 mg/kg of organic selenium, in a 2 × 2 × 2 factorial design. The whole body protein and lipid content were affected by the dietary oil source. Fish oil diets increased long‐chain (LC) PUFAs content in the edible tissues, while vegetable oil‐based diets increased short‐chain (SC) PUFAs. Vegetable oil diet tended to decrease the fish protein content. A higher lipid liver content was observed in meagre fed the vegetable oil blend. The results also suggested the ability of meagre to convert SC‐PUFA to LC‐PUFA when the vegetable oil is included in their diet. The possibility for partial substitution of fish oil by vegetable oil in meagre diets, resulting in lower dependence of fish oil in meagre farming, is also demonstrated here. Practical applications: The growing importance of aquaculture for basic food supply, and the urge for cost‐effective and sustainable feeds that maintain or even increase fish quality, makes the search for alternatives to common feeds a route of upmost importance, as the vegetable oil here addressed. SC‐PUFA and LC‐PUFA contents of the studied tissues increased with diets supplemented with 17% oil level, which may ultimately add more value to this farmed species. These results indicate the possibility of the partial substitution of fish oil by vegetable oil in meagre diets, resulting in lower dependence on fish oil for fish farming. Meagre were fed with different dietary lipid sources and levels, with or without selenium supplementation, in a total of eight experimental diets during 60 days, in a 2 × 2 × 2 factorial design. Fish oil diet increases HUFAs and vegetable oil diet increases PUFAs in body composition. There is great potential for partial substitution of fish oil by vegetable oil in meagre (Argyrosomus regius) diets, resulting in lower dependence of fish oil in meagre farming.

Responses of Chemical Functional Groups in Coleus Blumei Roots under Lead Stress with Exogenous Selenium Treatment Using 2-dimensional Correlation FTIR Spectra

“…This indicates that there were no changes in the chemical composition of the roots, but that their contents were influenced by treatment with Pb and Se. This finding is consistent with results from recent reports on grape pomace [36] and meager [37]. The absorption peaks displacement of certain functional groups involved in heavy metal adsorption changes to different degrees, e.g., the absorption peak of OH group (3,416-3,900 cm −1 ), and carbonyl group (1,000-1,100 cm −1 , and 1,270 cm −1 ), which may act as Pb ligands and participate in the processes of Pb sequestration in coleus roots with exogenous Se treatments [38].…”

Comparison of Fatty Acid and Biochemical Composition of Cultured Meagre (Argyrosomus regius Asso 1801) in Two Different Regions of Turkey

“…Similar results were obtained by Atalay and Bilal [4] who evaluated different commercial diets in sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax). In addition, Yildiz et al (2008) studying with the sea bream and sea bass, Grigorakis et al [18] and Simões et al [19]studying with meagre reported that the fatty acid composition of fish fillet generally reflects the dietary fatty acids. Most probably, these changes reflect variations in the feeding regime applied during culture.…”

Exploring Omega-3′s Impact on the Expression of Bone-Related Genes in Meagre (Argyrosomus regius)

“…In fact, deleterious effects were observed when high Omega-3 levels were included in diets accompanied by a low level of antioxidants in larval stages of other species such as in sea bass [185] or sparus aurata [19]. This is due to the fact that cartilage and bone cells or matrix vesicles are composed of PUFAs that are very prone to suffer lipid peroxidation, and this can represent a risk for bone health [73,186,187]. These results could be in agreement with our results, due to the diet with a moderate level of Omega-3 seeming to present a higher capacity to combat oxidative stress due to the higher expression of antioxidant molecules and reduced expression of molecules that promote fatty acid oxidation.…”