Effects of Replacing Squid Oil with Dietary Vegetable Oils on Growth, Fatty Acid Composition and Expression Levels of Fatty Acyl Delta6 Desaturase mRNAs in Black Ear Catfish, Pangasius larnaudii

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Thanathip Lamkom
Kanokwan Sarnsamak
Kanjana Payooha
Sirawut Klinbunga

Abstract

A 6-month feeding trial on four experimental diets containing squid oil (SO), palm oil (PO), soybean oil (SBO) and sunflower oil (SFO) in juvenile black ear catfish (Pangasius larnaudii) was performed. Fish fed each source of vegetable oils exhibited a higher final weight and ADG (months 4 – 6) than those fed the SO diet (P < 0.05). Final weight gain (FWG) and specific growth rate (SGR) of fish fed PO and SBO were greater than those fed with SO diet (P < 0.05). The EPA/ARA ratio in muscle of fish fed SO and PO was higher than that of fish fed the SFO diet (P < 0.05). In addition, the full-length cDNAs of fatty acyl delta6 desaturase (Plfadsd6; 1748 bp) were isolated. Its expression levels in fish fed the PO diet were greater than those fed other diets (P < 0.05). PlFadsd6 in fish fed SO was not significantly different from fish fed SBO (P > 0.05) but greater than those fed the SFO diet (P < 0.05). Results of the present study suggest that the diet containing SO may be more appropriately replaced with PO than SBO and SFO in the grow-out diet for P. larnaudii.

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How to Cite
Lamkom, T., Sarnsamak, K., Payooha, K., & Klinbunga, S. (2017). Effects of Replacing Squid Oil with Dietary Vegetable Oils on Growth, Fatty Acid Composition and Expression Levels of Fatty Acyl Delta6 Desaturase mRNAs in Black Ear Catfish, Pangasius larnaudii. Journal of Fisheries and Environment, 41(3), 12–27. Retrieved from https://li01.tci-thaijo.org/index.php/JFE/article/view/89221
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