Refereed journal article or data article (A1)
Influence of environmental conditions, population density, and prey type on the lipid content in Baltic herring (Clupea harengus membras) from the northern Baltic Sea
List of Authors: Marjut Rajasilta, Jari Hänninen, Lea Laaksonen, Päivi Laine, Jukka-Pekka Suomela, Ilppo Vuorinen, Katja Mäkinen
Publisher: Canadian Science Publishing
Place: Ottawa
Publication year: 2019
Journal: Canadian Journal of Fisheries and Aquatic Sciences
Journal acronym: CJFR
Volume number: 76
Issue number: 4
Start page: 576
End page: 585
Number of pages: 10
ISSN: 0706-652X
eISSN: 1205-7533
DOI: http://dx.doi.org/10.1139/cjfas-2017-0504
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/35436444
Global climate change can affect the energy content of fish by altering their lipid physiology and lipid consumption. We investigated the effects of different environmental stressors on the lipid content of the Baltic herring (Clupea harengus membras) from spawning ground samples that were collected annually in the northern Baltic Sea. During 1987-2014, the average lipid content in herring muscle decreased from 5-6% (w.wt.) to 1.5% (w.wt.). Generalized linear mixed models (GLMMs) indicated that sea water salinity and the size of the herring stock explained best the declining trend of lipid content. We estimated that the amount of the lipid storage incorporated in the spawning stock decreased by approximately 45% during the study, with respective energy content decreases. Fatty acid composition analysis revealed that herring lipids contained a high proportion of EPA (20:5n-3) and DHA (22:6n-3), which originated from its main summertime prey, Limnocalanus macrurus. The results illustrate various climate change-induced processes leading to changes in the lipid content of the Baltic herring and, consequently, to changes in the energy flows of the northern Baltic ecosystem.
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