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Fatty acid composition as indicator of food intake in cod larvae (Gadus morhua L.) from Lofoten, northern Norway

Tilseth, Snorre; Klungsøyr, Jarle; Falk-Petersen, Stig; Sargent, J.R.
Working paper
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CM_1987_L_31.pdf (2.568Mb)
URI
http://hdl.handle.net/11250/104346
Date
1987
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  • ICES CM documents authored by IMR scientists (1949-2011) [3138]
Original version
This report is not to be cited without prior reference to the authors  
Abstract
The year class strength of the Arcto-Norwegian cod is mainly

determined during the early life stages. The mortality is caused

both by starvation and predation which are linked to environmental

factors during this period. Stomach content analysis of

first feeding larvae show that nauplii of Calanus finmarchicus is

the most important diet. The larvae are, however, frequently

found with "green gut" content.

The fatty acid composition of lipids in marine animals reflects

both the diets and bio-synthetic activities of the animals. The

fatty acid composition of the most important prey items can be

used as an indicator of the dietary lipids intake of the cod

larvae.

The fatty acids of total lipid were analysed from phytoplankton,

eggs and nauplii of Calanus finmarchicus and cod eggs and larvae

from Lofoten waters. Gas chromatographic and gas chromatographicmass

spectrometric methods were used in the analyses.

On the basis of these analyses we suggest that the lipids of

phytoplankton form an important part of the diets of cod larvae

during the first feeding period and that calanoid nauplii are

more important at later larval stages.
Publisher
ICES
Series
ICES CM Documents;1987/L:31

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