Stiansen, J. J.E.. Institute of Marine Research, jan.erik.stiansen@imr.no
Sundby, S. J.E.. Institute of Marine Research, svein.sundby@imr.no
Ellertsen, B. B.. Institute of Marine Research, bjoernar.ellertsen@imr.no
Fossum, P. P.. Institute of Marine Research, petter.fossum@imr.no

 
A FIELD INVESTIGATION OF SMALL SCALE TURBULENCE ON THE INGESTION RATE OF COD LARVAE
 
Turbulence is an important factor for planktonic predator-prey interrelationships, as it increases the contact rate between the relatively immobile planktonic organisms. Wind-induced turbulence has been shown to increase the feeding rate of first-feeding cod larvae by a factor of 7 when wind speed increases from 2 to 10 m/s. There are, however, also other sources of turbulence, e.g. tidal mixing, free convection and swell-induced turbulence, which can influence the feeding rate of fish larvae. During spring in 1995 and 1996 direct measurements of small scale turbulence, induced by swell, tidal current and wind, was measured by acoustic current meters from an underwater tower in Lofoten, Northern Norway. Vertical distribution of cod larvae and zooplankton, together with hydrographical data, were obtained simultaneous by a research vessel at the location. From this data the ingestion rate of the cod larvae were derived from the gut content and compared with the energy dissipation rates calculated form turbulent energy spectra.
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: SS01TU0333S