Composition and Distribution of Lipids in Different Tissues of the Arrow Squid <i>Loligo bleekeri</i>

Abstract

Lipid class, fatty acid, and glyceryl ether composition in different tissues of the male and female ar row squids Loligo bleekeri was determined.In both sexes of this species, the livers had a relatively high amount of lipids, which were character ized by high quantities of triglyceride class. On the contrary, the lesser lipids from the muscles and gonads were low in the above lipid class but high in phospholipids. The unsaponifiable matters isolated from the tissue lipids contained remarkably high levels of sterols and minor amounts of glyceryl ethers and alkenyl types. The component fatty acids of the muscle and/or liver lipids were very similar in com position between both sexes, respectively. Few differences were found in the percentage of the compo nent fatty acids between the lipids from the testes and ovaries. While the fatty acid composition of the muscle lipids was markedly different from that of the liver lipids, the former tending to be more poly enoic with abundant 22:6n-3 acid. Glyceryl ethers of the male and female liver lipids showed similar components: the most predominant constituent was chimyl alcohol.

Studies on the Lipid Composition of Liver (Digestive Gland) Oil of Cuttlefish Sepia Prashadi (Winckworth, 1936)

“…According to results of Phillips KL et al (2001), FFA were moderately high, comprising of 11.7 ± 6.9 % of total lipids in Macquarie Island squid and 5.4 ± 1.2 % in Heard Island squid 22 . Similarly high FFA concentrations in the digestive gland have been reported for several other squid species and the lantern shark; Etmopterus granulosus contained 8 % of free fatty acids [68][69][70][71] . Fatty acids are "carboxylic acids (or "organic acid"), often with long aliphatic tails (long chains), either saturated or unsaturated.…”

Predation on myctophids by the squid Moroteuthis ingens around Macquarie and Heard Islands: stomach contents and fatty acid analyses

“…Free fatty acids were moderately high, comprising 11.7 ± 6.9% of total lipids in Macquarie Island squid and 5.4 ± 1.2% in Heard Island squid. High free fatty acid concentrations in the DG have been reported for several other squid species (Hayashi et al 1985, Hayashi & Yamamoto 1987b, Kawasaki et al 1994, Hayashi 1996 largely due to the enzymatic activity of the DG rather than to being products of storage. Major fatty acids in the DG were 16:0, 18:1n9 and 20:1n9 (Table 5).…”

Cultivation of Microorganisms in the Cultural Medium Made from Squid Internal Organs and Accumulation of Polyunsaturated Fatty Acids in the Cells

“…Squid internal organs are rich in polyunsaturated fatty acids (PUFAs) such as eicosapentaenoic acid (EPA; 20:5 n)3) and docosahexaenoic acid (DHA; 22:6 n)3) (Hayashi 1996). In the squid medium, lipids still remained at approximately 1 mg ml )1 .…”

“…Although squid internal organs are partly used as food (Shio-kara, salted fish guts of squid), most of them are processed as wastes. Lipids are abundant in squid intestines (Hayashi 1996). Therefore, the extraction of squid oils from squid intestines has already been commercialized.…”

“…We have focused on lipids, and in particular on polyunsaturated fatty acids (PUFAs) such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are abundantly in the squid internal organs (Hayashi 1996). More attention has been paid to the molecular form of PUFAs in recent years.…”