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Fatty Acid Composition of Three Marine Fishes of the Bay of Bengal

Habibur R. Bhuiyan
BCSIR Laboratories, Chittagong, Bangladesh.

K. K. Nath
BCSIR Laboratories, Chittagong, Bangladesh.

P. Seal
BCSIR Laboratories, Chittagong, Bangladesh.

Mir Ezharul Hossain
BCSIR Laboratories, Chittagong, Bangladesh.

Abstract/ Executive Summary:

Oil samples collected from three fishes namely Sting Ray (Dasyatis uarrnak), Anchovy (Setipinna taty), and Eel (Congresox talabonoides) from the Bay of Bengal were analyzed to determine their fatty acid composition with the aid of Gas Liquid Chromatography (GLC). The saturated fatty acid contents were 52.95, 45.28 and 52.29 %; and the unsaturated fatty acid contents were 43.97, 54.72 and 33.39 % in D. uarnak, S. taty and C. talabonoides respectively. The highest polyunsaturated fatty acid content was found in S. taty (13.65 %) and the lowest was in D. uarnak (8.06 %). The ω-3 fatty acid contents were 4.58, 3.65 and 9.91 % and the ω-6 fatty acid contents were 3.48, 10.00 and 5.50 % in D. uarnak. S. taty and C. talabonoides respectively. Two essential fatty acid linoleic acid (4.12 %) and arachidonic acid (5.32 %) contents were found higher in S. taty whereas another essential fatty acid linolenic acid (8.98 %) found higher in C. talabonoides. Another important polyunsaturated fatty acid eicosapentaenoic acid (2.12%) found higher in D. uarnak.

Keywords: Fatty acid, Marine fishes, Bay of Bengal

Location:

Start Date:

End Date:

Program Area: Quality and Nutrition

Commodity: Marine fish

Objectives:

This report will increase the information of fatty acid composition of oils of the three marine fishes namely Sting Ray (Dasyatis uarnak), Anchovy (Setipinna taty) and Eel (Congresox talabonoides) as well as their nutritional value and commercial importance for better utilization of these three species.

Methodology:

Raw materials collection: The fish species of the Bay of Bengal were collected from fishery ghat, Chittagong. Fat extraction: The fish oil samples were extracted from Sting Ray (D. uarnak) liver, Eel (C. talabonoides) body muscle and Anchovy (S. taty) body muscle by solvent extraction method.2,5 Saponification and esterfication Oil samples were then saponified with methanolic potassium hydroxide and with hexane and evaporated to dryness.4 The dried saponified materials were esterified with benzoic acid and boron-trifluoride methanol complex and extracted with hexane and concentrated to a suitable volume.4 Standard: Standard methyl esters of fatty acids were procured from E. Mark and Sigma in dry condition in ampoules. The ampoules were broken and methyl esters were dissolved in petroleum ether. The mixture containing methyl esters of 11 fatty acids namely Caprylic (C8:0), Capric (C10:0), Lauric (C12:0), Myristic (C14:0), Palmitoleic (C16:1), Stearic (C18:0), Oleic (C18:1), Linolenic (C18:3), Linoleic (C18:2), Arachidic (C20:0) and Behenic (C22:0) acids were used as standard for Gas Liquid Chromatography.4 Fatty acid % was calculated as peak area/total area x 100 and peak area was height x width at the half height.

Source of Information: Bangladesh J. Sci. Ind. Res. 41(1-2), 47-54, 2006

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Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the present study of fatty acid composition of these fish oils showed a beneficial effect on nutritional and commercial purposes.

Knowledge Management: Journal