Distribution and composition of fatty acids in muscle lipids of inshore fish and deep water sharks from the eastern Mediterranean

Abstract. Observations of tritium and 3He in the Tyrrhenian Sea, 1987–2009, confirm the enhanced convective mixing of intermediate waters into the deep waters that has been noted and associated with the Eastern Mediterranean Transient in previous studies. Our evidence for the mixing rests on increasing tracer concentrations in the Tyrrhenian deep waters, accompanied by decreases in the upper waters, which are supplied from the Eastern Mediterranean. The downward transfer is particularly evident between 1987 and 1997. Later on, information partly rests on increasing tritium-3He ages; here we correct the observed 3He for contributions released from the ocean floor. The Tyrrhenian tracer distributions are fully compatible with data upstream of the Sicily Strait and in the Western Mediterranean. The tracer data show that mixing reached to the bottom and confirm a cyclonic nature of the deep water circulation in the Tyrrhenian. They furthermore indicate that horizontal homogenization of the deep waters occurs on a time scale of several years. Various features point to a reduced impact of Western Mediterranean Deep Water (WMDW) in the Tyrrhenian during the enhanced-convection period. This is an important finding because it implies less upward mixing of WMDW, which has been named a major process to enable the WMDW to leave the Mediterranean via the Gibraltar Strait. On the other hand, the TDW outflow for several years represented a major influx of enhanced salinity and density waters into the deep-water range of the Western Mediterranean.

Download Full-text

Comparative analysis of the fatty acid composition of deep-water Baikal amphipods

Crustaceana ◽

10.1163/15685403-00003856 ◽

2019 ◽

Vol 92 (1) ◽

pp. 57-72

Author(s):

Selmeg V. Bazarsadueva ◽

Larisa D. Radnaeva ◽

Arnold K. Tulokhonov

Keyword(s):

Fatty Acids ◽

Fatty Acid Composition ◽

Fatty Acid ◽

Acid Composition ◽

Lake Baikal ◽

Deep Water ◽

Monounsaturated Fatty Acids ◽

Manned Submersible ◽

Main Fatty Acid ◽

Low Levels

Abstract In this report, we have compared the fatty acid composition of the endemic Lake Baikal amphipods Ommatogammarus albinus (Dybowsky, 1874) and Parapallasea lagowskii (Dybowsky, 1874). Specimens were sampled using the deep-water manned submersible “Mir” at the oil-methane seeps of Cape Gorevoy Utes and at a hydrothermal vent in Frolikha Bay. High levels of monounsaturated fatty acids and relatively low levels of saturated and polyunsaturated fatty acids were detected in the studied amphipods, with oleic and palmitic acid representing the main fatty acid components. The habitat of the amphipods exerted a profound effect on their fatty acid profile: the amphipods of Gorevoy Utes contained higher levels of linolenic 18:3n3 and arachidonic 20:4n6 acids, while the amphipods of Frolikha Bay contained higher levels of eicosapentaenoic 20:5n3 and docosahexaenoic 22:6n3 acid. Based on these findings, we suggest that the amphipods’ diet in different areas of Lake Baikal determines their fatty acid composition.

Download Full-text

Seasonal changes in the proximate chemical compositions and fatty acids of chub mackerel (Scomber japonicus) and horse mackerel (Trachurus trachurus) from the north eastern Mediterranean Sea

International Journal of Food Science & Technology ◽

10.1111/j.1365-2621.2007.01549.x ◽

2008 ◽

Vol 43 (5) ◽

pp. 933-938 ◽

Cited By ~ 41

Author(s):

Mehmet Celik

Keyword(s):

Fatty Acids ◽

Seasonal Changes ◽

Eastern Mediterranean ◽

Chemical Compositions ◽

Scomber Japonicus ◽

Chub Mackerel ◽

Trachurus Trachurus ◽

Eastern Mediterranean Sea ◽

The North ◽

North Eastern

Download Full-text

Lipid Absorption and Deposition in Rainbow Trout (Salmo gairdnerii)

Canadian Journal of Biochemistry ◽

10.1139/o73-137 ◽

1973 ◽

Vol 51 (7) ◽

pp. 1050-1058 ◽

Cited By ~ 69

Author(s):

J. Stephen Robinson ◽

James F. Mead

Keyword(s):

Fatty Acids ◽

Rainbow Trout ◽

Palmitic Acid ◽

Free Fatty Acids ◽

Intestinal Absorption ◽

Lipid Absorption ◽

Portal System ◽

Absorption Mechanism ◽

Dark Muscle ◽

Muscle Lipids

Rainbow trout, fed or starved for 5 weeks, were force-fed 23 μCi 1-14C-palmitic acid and sacrificed at [Formula: see text], 1, 2, 4, 8, and 14 h after feeding. Analysis of the blood suggested that trout possess an intestinal absorption mechanism for lipid that is very different from that found in other animals. The fish, incapable of delivering triglyceride to its circulation in the usual way, receives most of its absorbed lipid as free fatty acids, probably via the portal system. It was also found that light muscle more easily yielded its triglyceride stores, in agreement with its role as the major lipid depot in trout. Nonetheless, dark muscle was metabolically more active in deposition of muscle lipids. Dark muscle appeared to function more as an organ than a kinetically responsible contractile body.

Download Full-text