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Fatty acid composition of lipid-rich myctophids and mackerel icefish (Champsocephalus gunnari) - Southern ocean food-web implications

journal contribution
posted on 2023-05-16, 13:54 authored by Mary-Anne LeaMary-Anne Lea, Peter Nichols, Wilson, G
The lipid content, fatty acid composition and calorific value of seven species of mesopelagic deep-sea fish of the family Myctophidae and the mackerel icefish, Champsocephalus gunnari, important in the diet of Southern Ocean marine predators, are presented. Fish were sampled at the Kerguelen Plateau (KP) and Macquarie Ridge (MR) in the Indian and Pacific sectors of the Southern Ocean respectively, to examine geographic variation in lipid compositon. All species of myctophid from KP and Electrona antarctica from MR were high in lipid content (6-18% wet mass), particularly Gymnoscopelus nicholsi (18%) and E. antarctica (15%). The mackerel icefish, and G. fraseri and Protomyctophum tenisoni from MR were generally lower in lipid content (3-5%) and varied significantly in fatty acid composition from KP species. KP myctophids were high in calorific content (9.3 kJ g-1 wet mass) when compared with icefish (5.4 kJ g-1 wet mass) and other published values for prey items of marine predators such as squid (1.74-5 kJ g-1). KP myctophids were distinguished from each other and from C. gunnari and MR specimens by cluster and discriminant function analysis using six fatty acids (16:0, 18:1ω9, 20:1ω9, 22:1ω11, 20:5ω3, 22:6ω3).

History

Publication title

Polar Biology

Volume

25

Issue

11

Pagination

843-854

ISSN

0722-4060

Department/School

Institute for Marine and Antarctic Studies

Publisher

Springer-Verlag

Place of publication

USA

Repository Status

  • Restricted

Socio-economic Objectives

Assessment and management of coastal and estuarine ecosystems

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