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Feeding conditions of north-east Arctic (Arcto-Norwegian) cod larvae compared to the Rothschild-Osborn theory on small-scale turbulence and plankton contact rates

Sundby, Svein; Fossum, Petter
Working paper
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CM_1989_G_19.pdf (669.0Kb)
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http://hdl.handle.net/11250/104609
Utgivelsesdato
1989
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Originalversjon
This report is not to be cited without prior reference to the authors  
Sammendrag
Data on first feeding North-east arctic cod larvae in Lofoten, sampled

during the period 1976 - 1984, are examined to verify the theory on

the influence of microturbulence on the contact rate between predator

and prey (Rothschild and Osborn, 1988). The number of prey per gut

of the cod larvae are compared to the concentration of prey, Calanus

finmarchicus nauplii, and to data on wind speed and static stability

of the upper layer. The data indicate that the contact rate increases

by 2. 8 when the average wind speed increases from 2 m s -1 to 6 m s -1 .

Independent data on cod larval cruising speed, the velocity and

concentration of prey organisms, inserted into the model of Rothschild

and Osborn (1988) show a comparable increase of the contact rate of

2.2 for the same increase of wind speed. Larval stages of North-east

arctic cod are important for the formation of the year class. Larval

stages are confined to the mixed layer, and therefore the variable

contact rate induced by wind mixing is an important regulatory

mechanism for the formation of year class strength.
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ICES
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ICES CM Documents;1989/G:19

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