Operational fish larval drift modelling Bjørn Ådlandsvik og Frode Vikebø Institute of Marine...
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Transcript of Operational fish larval drift modelling Bjørn Ådlandsvik og Frode Vikebø Institute of Marine...
![Page 1: Operational fish larval drift modelling Bjørn Ådlandsvik og Frode Vikebø Institute of Marine Research Opnet meeting, Geilo, 14-15 May 2008.](https://reader036.fdocuments.us/reader036/viewer/2022062401/5a4d1b0f7f8b9ab05998e228/html5/thumbnails/1.jpg)
Operational fish larval drift modelling
Bjørn Ådlandsvik og Frode VikebøInstitute of Marine Research
Opnet meeting, Geilo, 14-15 May 2008
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Why larval drift modelling
Study recruitment processes in fish stocks Prediction Effects of climate variability
Basis for biological Individual Based Models Larval behaviour in the vertical Growth Survival
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Why operational
Fish eggs and larvae are vulnerable to oil spill accidents A year class of a major fish stock is worth GNOKs
Useful information for fish larval surveys Useful information for sea bird research ...
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How?
Particle tracking Lagrangian Advection and Diffusion model, LADIM
Start from knowledge of typical spawning areas Include simple Individual Based Model
Vertical movement Temperature dependent growth
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Operational requirement
Consistency requirement for oil spill overlap analysis:
Fish larvae and oil transport must be forced from the same regional ocean circulation model Otherwise exposure will be controlled by different
current patterns
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Difference from oil drift models
Oil drift: Usually know initial condition
time and location of oil spill Larval drift:
Knowledge of typical spawning areas and times Longer simulation time Can be reinitialized if more information becomes
available
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Practical implementation
Daily download operational ocean model forecast (Nordic4km) from met.no to IMR
Append to a current and hydrographic archive Rerun the offline larval drift simulation from
spawning/hatching Make plots and put the results on a web site
Presently: http://www.imr.no/~bjorn/oplarve
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Cod from Møre
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Cod from Moskenesgrunnen
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Cod from Malangsgrunnen
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Total cod larvae distribution
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Total herring larvae distribution
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Vertical behaviour for herring larvae Day: 5-20 m, Night:
20-40 m Vertical swimming
speed up to 1/6 bodylength per second
Combination of a deterministic and a random component
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To do
Improve the design of the web site Now home made, get help from info dep.
Give the web site a more prominent (and permanent) URL at www.imr.no
Implement larval drift into operational model suite at met.no 24/7 operational organization More frequent updates of current forcing