Restoration of the fatty acid composition of red seabream (Pagrus auratus) using a fish oil finishing diet after grow‐out on plant oil based diets

By B. Glencross, Wayne Hawkins, J. Curnow. 2003

129 citations recorded by the source corpus.

This study evaluated the potential for manipulating the fatty acid composition of juvenile red seabream, Pagrus auratus. Prior to the start of the study, three groups of fish had been reared for 3 months on a fish oil based diet or diets where the added fish oil had been replaced with either canola or soybean oil. In the present study, fish that had previously been fed either the canola or soybean oil diets were fed a fish oil based diet. Three additional treatments included fish being maintained on their original diets of fish oil, canola oil or soybean oil. Fish were fed their respective diets twice daily to apparent satiety for 32 days. Samples of fish from each treatment were collected after 0, 1, 2, 4, 8, 16 and 32 days. Composition and growth of the fish were determined at each sample point. Most treatments showed no differences in growth performance, although fish fed a fish oil diet after previously being fed a soybean oil diet showed slightly better growth. No significant differences among treatments were observed in proximate composition of the fish, although there was a significant increase in total fat and individual fatty acid (g kg−1 live-weight) content of the fish from all treatments over the period of the study. No significant changes in the relative fatty acid composition (% of total fatty acids) over time were observed in the three treatments where fish were maintained on their original diets. In contrast, fish that were previously fed either the canola or soybean oil diets and were then fed a fish oil diet had significant changes in both the relative (% of total fatty acids) and absolute (g kg−1 live-weight) fatty acid content. Key changes observed included a decrease in the relative levels of polyunsaturated fatty acids (PUFA) such as 18 : 2n − 6 and 18 : 3n − 3. Increases in the relative levels of the long-chain polyunsaturated fatty acids (lcPUFA) 20 : 5n − 3 and 22 : 6n − 3 were also observed in both treatments. The rates of absolute (g kg−1 live-weight) change/accumulation of these fatty acids followed an exponential equation that differed for each fatty acid in each treatment. Examination of the retention efficiency of specific fatty acids also showed marked differences between fatty acids within treatments and also differences between treatments. Biologically important fatty acids such as 20 : 5n − 3 and 22 : 6n − 3 had only moderate retention efficiencies and these were unaffected by treatment. In contrast, the retention efficiencies of 18 : 2n − 6 and 18 : 3n − 3 suggested selective retention of these fatty acids when fed fish oil diets, but moderate catabolism when fed the plant oil diets. There were also high retention efficiencies of most saturated and monounsaturated fatty acids suggestive of active retention and/or active synthesis of these fatty acids by the fish. The results of this study, particularly the increases in lcPUFA, support the usefulness of a fish oil based finisher diet for fish raised predominantly on plant oil based diets.

Subfields: Aquatic Science, Immunology, Physiology

View Paper: https://www.semanticscholar.org/paper/90f463523077e564a00f318044e6e1e10f7124da

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aquatic Science

1. D. Tocher
2. J. Bell
3. C. C. Kohler
4. M. T. Arts
5. R. Waagbø
6. D. Montero
7. M. J. Caballero
8. M. Izquierdo

In Immunology

1. C. C. Kohler
2. M. T. Arts
3. R. Waagbø
4. D. Montero
5. J. Bell
6. M. J. Caballero
7. M. Izquierdo
8. L. Robaina

In Physiology

1. C. C. Kohler
2. R. Waagbø
3. D. Montero
4. D. Tocher
5. J. Bell
6. M. T. Arts
7. G. Rosenlund
8. M. J. Caballero

Citations in the corpus

• The time course of fish oil wash-out follows a simple dilution model in gilthead sea bream (Sparus aurata L.) fed graded levels of vegetable oils. (2009, methodology): “Jobling (2004a) again evaluated the dilution model with data from red 322 sea bream studies (Glencross et al., 2003), and a high degree of concordance was found 323 between the predicted and observed values.”
• Effect of dietary canola oil level on the growth performance and fatty acid composition of juvenile red sea bream, Pagrus major (2007, background): “Although the second study by Glencross et al. (2003b) did observe that CO could comprise 68% of the dietary lipid of pink snapper, it is noteworthy that the fish were in a relatively slow growth phase (final body weights were ∼1.5 fold higher than the initial body weights) and the study duration…”
• Safe and Nutritious Aquaculture Produce: Benefits and Risks of Alternative Sustainable Aquafeeds (2008, background): “Numerous studies, in a wide range of fish species, have shown that flesh fatty acid compositions are closely correlated to dietary fatty acid compositions and that feeding high levels of VO will strongly influence flesh fatty acid compositions (Bell et al. 2004a; Izquierdo et al. 2003; Caballero et ”
• Alterations in fillet fatty acid profile and flesh quality in gilthead seabream (Sparus aurata) fed vegetable oils for a long term period. Recovery of fatty acid profiles by fish oil feeding (2005, background): “, 1995) or in red seabream, where complete substitution of fish oil by soybean oil resulted in a more juicy flesh (Glencross et al., 2003).”
• Health and condition in fish: the influence of lipids on membrane competency and immune response (2009, background): “…and Kohler 1999 ; Wonnacott et al. 2004 ; Lewis and Kohler 2008) , rainbow trout ( Oncorhynchus mykiss) (Caballero et al. 2002) , Atlantic salmon (Bransden et al. 2003) , gilthead seabream ( Sparus aurata) (Izquierdo et al. 2003 ), and red seabream ( Pargrus auratus) (Glencross et al. 2003) .”