Assessment of dietary lipid sources in tropical gar, Atractosteus tropicus larvae: Growth parameters and intermediary lipogenic gene expression

Five experimental diets containing different lipid sources, fish oil (D1), soybean lecithin (D2), corn oil (D3), canola oil (D4) and olive oil (D5), were evaluated in Atractosteus tropicus larvae for the relative gene expression of the enzymes fatty acid synthase (fas), acetyl‐CoA carboxylase 1 (acc...

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Published in:Aquaculture research 2020-07, Vol.51 (7), p.2629-2640
Main Authors: Jiménez‐Martínez, Luis Daniel, Tovar‐Ramírez, Dariel, Álvarez‐González, Carlos Alfonso, Peña‐Marín, Emyr, Camarillo‐Coop, Susana, Martínez‐García, Rafael, Palacios‐Mechetnov, Elena, Martínez‐Yañez, Rosario, Concha‐Frías, Bartolo
Format: Article
Language:English
Subjects:
Atractosteus tropicus
Cannibalism
Canola oil
Carnitine
Carnitine palmitoyltransferase
Corn oil
Diet
Energy requirements
Fatty acids
Fatty-acid synthase
Feeding experiments
Fish
Fish oils
Gene expression
Growth
Larvae
Larval development
Lecithin
Linolenic acid
Lipids
Lipogenesis
nutrition
Oil
Olive oil
Oxidation
Palmitoyltransferase
Polyunsaturated fatty acids
Regulators
Soybeans
Survival
Tropical climate
Vegetable oils
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Summary:Five experimental diets containing different lipid sources, fish oil (D1), soybean lecithin (D2), corn oil (D3), canola oil (D4) and olive oil (D5), were evaluated in Atractosteus tropicus larvae for the relative gene expression of the enzymes fatty acid synthase (fas), acetyl‐CoA carboxylase 1 (acc1) and carnitine palmitoyltransferase 1C (cpt1c), in addition to their effects on larval growth, survival and cannibalism during a 30‐day feeding trial. Higher growth and survival were obtained in treatments D1 and D2, and lower performance in diets D3, D4 and D5. The highest levels of expression of fas and acc1 occurred in larvae fed with D1, which contained high amounts of n‐3 long‐chain polyunsaturated fatty acids (LC‐PUFA), mainly DHA and EPA FA are regulators of lipogenesis. The higher cpt1c expression in plant‐based diets is attributed to the fact that these diets are rich in α‐linolenic acid (ALA) and low DHA, EPA and ARA levels that favour ß‐oxidation. In conclusion, the diets with fish oil (D1) and soybean lecithin (D2) were the best treatments for larval growth, survival and cannibalism and thus appear to meet both lipid and energy requirements of A. tropicus larvae, meanwhile the use of vegetable oils influences the expression of intermediary lipogenic genes.
ISSN:1355-557X
1365-2109
DOI:10.1111/are.14603