Effect of partial substitution of dietary fish oil by vegetable oils on desaturation and β-oxidation of [1-14C]18:3n−3 (LNA) and [1-14C]20:5n−3 (EPA) in hepatocytes and enterocytes of European sea bass (Dicentrarchus labrax L.)

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“…It was also reported that the use of vegetable oil rich in linoleic acid to substitute fish oil might cause increasing of arachidonic acid in fish tissue (Torstensen and Tocher, 2010). Similar to our study, Mourente et al (2005) and Pratoomyot et al (2008) found that arachidonic acid level of vegetable oils were lower than fish oil. In our study, arachidonic acid level in the tissues (muscle and liver) of the fish fed with vegetable oil diets except for 33-67 SO-LO were higher than those fed with fish oil diet.…”

“…Several studies have shown that freshwater species are capable of producing arachidonic acid from linoleic acid (Jonasson, 2008;Ling et al 2006;Sargent, Bell, McEvoy, Tocher & Estevez, 1999;Tocher, Bell, MacGlaughlin, McGhee & Dick, 2001). It was reported that replacement of fish oil by blends of vegetable oils (rapeseed, linseed and palm oils) was increased the percentege of linolenic acid (18:3n-3) in diet and in tissues of fish (Mourente and Bell, 2006;Mourente et al 2005), and linolenic acid increased especially with the increasing in addition of linseed oil in diet (Montero et al 2005). Similar observations were made in our study.…”

Partial or total replacement of dietary fish oil with alternative lipid sources in silvery-black porgy (Sparidentex hasta)

“…The concentration of the total n−6 PUFA, especially LA, increased in the fillet of the fish fed the SO and SF diets; however, the level of the LA was lower in liver tissue relative to respective diets, indicated that this FA was not preferentially retained in liver or may be oxidized for energy production purposes. It was reported that, when VOs are included in the diet more of the C18-PUFA are selectively taken up by hepatocytes for β-oxidation as cellular energy sources (Mourente et al, 2005;Almaida-Pagán et al, 2007). Similarly, Wassef et al (2009) also reported that gilthead seabream utilize LA for oxidation that lead to lower concentration of this FA in fish body.…”

Growth performance and quality traits of European sea bass (D. labrax) fed diets including increasing levels of freeze-dried Isochrysis sp. (T-ISO) biomass as a source of protein and n-3 long chain PUFA in partial substitution of fish derivatives

“…deserves particular attention as it combines medium-high level and quality of protein with high lipid and DHA contents (Ben-Amotz et al, 1987;Brown et al, 1993;Sánchez et al, 2000), which makes it a potential candidate ingredient for highly sustainable diets, where besides fish meal, even substantial levels of fish oil have to be replaced by alternative sources. This would be particularly the case of diets for the European sea bass, which is notably incapable of significant biosynthesis of n-3(LC)PUFA (Mourente et al, 2005) and where a substantial replacement of fish oil by vegetable oils led to a marked reduction of the n-3(LC)PUFA content of the flesh (Montero et al, 2005;Mourente and Bell, 2006). To date, despite a favourable nutrient composition and encouraging results observed in gilthead sea bream juveniles (Palmegiano et al, 2009), the use of dried Isochrysis biomass as a raw material in fish diets has been poorly investigated in marine fish species.…”