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Fish oil replacement with different vegetable oils in Onychostoma macrolepis: Effects on fatty acid metabolism based on whole-body fatty acid balance method and genes expression

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Abstract

To evaluate the fatty acid (FA) metabolism status and possibility as a DHA source of farmed Onychostoma macrolepis, a total of 168 fish (2.03 ± 0.23 g) were fed four diets supplemented with fish oil (FO), linseed oil (LO), soybean oil (SO), and a mixture of LO and SO oil (MO), respectively, for 70 days. Body FA compositions were modified reflecting dietary FAs. Comparing liver and intestine fatty acids with fish fed four diets, the content of ARA in fish fed SO was significantly higher than others (P < 0.05), but showed no difference in muscle. The tissue FA profile showed that the FO-fed group successfully deposited DHA, while the LO-fed group converted ALA to DHA effectively, as well as the liver and intestine EPA was notably highest in the FO group, whereas no difference between the FO and LO group in the muscle. The FA results showed that the DHA contents in the muscle of Onychostoma macrolepis are at a medium-high level compared with several other fish species with the highest aquaculture yield. Correspondingly, in the fish fed diet with LO, SO, and MO, the genes of most FA biosynthesis, transportation, and transcriptional regulation factors were increased in the liver and muscle, but no significant difference was observed in the gene expression of Elovl4b, FATP1, and FABP10 in the muscle. In addition, the enzyme activity involved in PUFA metabolism was higher in fish fed vegetable oil-based diets, corroborating the results of the gene expression. Increased in vivo elongase and desaturase (Δ5, Δ6, and Δ9) activities were recorded in fish fed fish oil-devoid diets, which resulted in the appearance of products associated with elongase and desaturase activities in fish. Besides, as the specific n-3 PUFA synthesis substrate, the dietary supplementation of ALA not only retains most of the nutrition value but also ensures the muscular texture, such as fiber diameter and density. It is concluded that farmed O. macrolepis owns strong n-3 LC-PUFA biosynthetic capacity and high DHA contents so it can be a good DHA source for the population.

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Data availability

No datasets were generated or analysed during the current study.

Abbreviations

ALA:

α-linolenic acid

ARA:

arachidonic acid

BHT:

butylated hydroxytoluene

CF:

condition factor

DHA:

docosahexaenoic acid

EFA:

essential fatty acids

Elovl :

elongation of very long-chain fatty acid proteins

EPA:

eicosapentaenoic acid

Fads :

fatty acyl desaturase

FAME:

fatty acid methyl esters

FBL:

final body length

FBW:

final body weight

FCR:

feed conversion ratio

FI:

feed intake

FLQ:

fish lipid quality/flesh lipid quality

HH:

hypocholesterolemic/ hypercholesterolemic ratio

HSI:

hepatosomatic index

IA:

index of atherogenicity

IBL:

initial body length

IBW:

initial body weight

IT:

index of thrombogenicity

IPFI:

intraperitoneal fat body index

LA:

linoleic acid

LC-PUFA:

long-chain polyunsaturated fatty acid

MUFA:

monounsaturated fatty acid

PUFA:

polyunsaturated fatty acid

RIL:

relative intestine length

RIW:

relative intestine weight

SFA:

saturated fatty acid

SGR:

specific growth rate

SUR:

survival rate

VSI:

viscerosomatic index

WFAB:

whole body fatty acid balance method

WG:

weight gain.

References

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Funding

All authors would like to thank our colleagues in Prof. Hong Ji’s laboratory for their helpful discussions. Sources of support for the work: This research program was supported by the Shanxi Provincial Postdoctoral Science Foundation (2023BSHEDZZ107).

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Authors and Affiliations

Authors

Contributions

Xiangtong Yuan: Methodology, Formal analysis, Investigation, Data curation, Writing – original draft. Ruofan Liu: Formal analysis, Investigation. Mingkui Wei: Data curation. Handong Li: Data curation. Jian Sun: Supervision. Hong Ji: Writing – review & editing, Project administration, Funding acquisition. All authors reviewed the manuscript.

Corresponding author

Correspondence to Hong Ji.

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Ethical approval

All experiments were approved by the Northwest A&F University Institutional Animal Care and Use Committee (NWAFU-DKXC- 20200602).

Competing interests

The authors declare no competing interests.

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Yuan, X., Liu, R., Wei, M. et al. Fish oil replacement with different vegetable oils in Onychostoma macrolepis: Effects on fatty acid metabolism based on whole-body fatty acid balance method and genes expression. Fish Physiol Biochem (2024). https://doi.org/10.1007/s10695-024-01357-y

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