Fatty acid composition in the white muscle of Cottoidei fishes of Lake Baikal reflects their habitat depth

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Radnaeva , L D , Popov , D V , Grahl-Nielsen , O , Khanaev , I V , Bazarsadueva , S V & Kakela , R 2017 , ' Fatty acid composition in the white muscle of Cottoidei fishes of Lake Baikal reflects their habitat depth ' , Environmental Biology of Fishes , vol. 100 , no. 12 , pp. 1623-1641 . https://doi.org/10.1007/s10641-017-0670-6

Title: Fatty acid composition in the white muscle of Cottoidei fishes of Lake Baikal reflects their habitat depth
Author: Radnaeva, Larisa D.; Popov, Dmitry V.; Grahl-Nielsen, Otto; Khanaev, Igor V.; Bazarsadueva, Selmeg V.; Kakela, Reijo
Contributor organization: Biosciences
Physiology and Neuroscience (-2020)
Functional Lipidomics Group
Date: 2017-12
Language: eng
Number of pages: 19
Belongs to series: Environmental Biology of Fishes
ISSN: 0378-1909
DOI: https://doi.org/10.1007/s10641-017-0670-6
URI: http://hdl.handle.net/10138/310741
Abstract: Lake Baikal is a unique freshwater environment with maximum depths over 1600 m. The high water pressure at the lakebed strengthens the solidifying effect of low water temperature on animal tissue lipids, and thus the effective temperatures in the depths of the lake equal subzero temperatures in shallow waters. Cottoidei species has colonized the different water layers of the lake, and developed different ecology and physiology reflected in their tissue biochemistry. We studied by gas chromatography the composition of fatty acids (FAs), largely responsible for tissue lipid physical properties, in the white muscle tissue of 13 species of the Cottoidei fish; five benthic abyssal, six benthic eurybathic and two benthopelagic species. The FA profiles reflected habitat depth. The muscles of the deepest living species contained little polyunsaturated FAs (PUFAs) and were instead rich in monounsaturated FAs (MUFAs), which may be due to occasional weak food web links to the PUFA-rich primary producers of the photic water layer, high MUFA supply from their benthic diet, and conversion of saturated FAs (SFAs) to MUFAs in the tissues of the fish. Despite the MUFA percentage among the abyssal species reached even 50% (by weight) of total FAs, the PUFA percentage still remained above 20% in every species. The muscle MUFA/SFA ratio correlated negatively with the PUFA content of the fish muscle, suggesting viscosity control integrating the fluidity contributions from the dietary PUFAs and potentially endogenous MUFAs.
Subject: Deep water fish
Monounsaturated fatty acids
Polyunsaturated fatty acids
Temperature adaptation
Trophic ecology
Viscosity homeostasis
White muscle
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion

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