Theses and Dissertations


Title: Lipid and fatty acid composition of red snapper, Lutjanus campechanus, ovaries and eggs

Name: Ross, M.T.

Degree: MS

Chair: Ronald P. Phelps

Resides:

University: Auburn University

Location: Auburn, Alabama

Date: 2003

Pages: 68

Keywords: Lipid,fatty acid composition,red snapper,Lutjanus campechanus,ovaries,eggs

Abstract:

Red snapper, Lutjanus campechanus, is an important commercial and recreational fish species in the Gulf of Mexico. Along with this importance comes high fishing pressure that has the potential to deplete red snapper stocks. Consequently there is considerable interest in culturing red snapper. However, the culture of red snapper has been inhibited by difficulties in the rearing of larval fish. This inability may be in part due to poor egg quality resulting from improper broodstock nutrition. This study assessed differences in total lipid content and fatty acid composition of red snapper ovaries from wild caught red snapper, red snapper offered an enriched diet, and red snapper offered an unenriched diet. Differences in total lipid and fatty acid composition were also examined between red snapper eggs from fish fed an enriched diet that spawned naturally in photoperiod tanks and wild caught fish that were induced to spawn with human chorionic gonadotropin. There were no significant differences in total lipid content among red snapper ovaries or between red snapper eggs. The polyunsaturated, n-3, and n-6 families in neutral lipids were significantly higher from wild red snapper ovaries compared to ovaries from red snapper that were offered the control and supplemented diets. The same trend was seen in polar lipids, with the n-6 family being significantly higher for wild. The neutral lipids from wild red snapper ovaries contained significantly larger amounts of linoleic acid (18:2n-6), linolenic acid (18:3n- 3), AA (20:4n-6), and DHA (22:6n-3). This same trend was seen in polar lipids, with AA being the only fatty acid that was significantly higher in wild fish.

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