. Assessment of the Icelandic cod stock Björn Ævarr Steinarsson Marine Research Institute.

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Presentation transcript:

. Assessment of the Icelandic cod stock Björn Ævarr Steinarsson Marine Research Institute

Components of advice (short-term) Data Data analysisAssess.Prediction Landings Length meas. Otoliths Surveys Catch in numbers Indices Stock assessment Predicted developm. of stock and catch Logbooks CPUE Otoliths Length m.

Input data Catch in numbers by age groups Survey indices Catch per unit effort (CPUE) from the fleet

Icelandic cod. Landings

Cod Landings by gear

Distribution of cod catches

Sampling from landings Allocation –Samples alloced proportional to landings in each fleet category - Real time. Implementation –MRI staff –Inspectors from the Fisheries Directorate –The Coast Guard Magnitude –Annually about length measurements and otoliths for ageing.

Cod Catch in number by age groups CV  20

Icelandic Groundfish Survey IGFS Annually about 600 fixed trawl stations taken in March all around Iceland since Performed by 4-5 identical trawlers Standarized trawl, trawling distance, trawling speed etc. About length measured and otoliths taken for ageing Gutted and ungutted weight, liver weight, gonad weight, stomach content anlysis, maturity etc.

IGFS Towing station in spring survey

IGFS - Primary objectives - Independent estimate of relative abundance. Annual indices of recruitment. Various biological parameters.

IGFS Total biomass index CV  10-16

IGFS Relative abundance index by age groups in 2002

Survey abundance vs number alive in the sea Number of fish of age a in survey Number of fish of age a in the sea

IGFS - COD Index of 3 years old vs. 4 years old a year later

Logbooks Example

Distribution of Logbooks records Bottom trawl Shrimp trawl Longline Capelin herring Dragnót Pelagic trawl Herring

Logbooks Objectives Collecting data to estimate CPUE/Effort Behavior of the fishing fleet Relationship with fishermen

CPUE vs Biomass CPUE (tonn/hour) Biomass (tonnes)

COD CPUE by gears

Distribution of cod catches

Greenland Halibut Main fishing areas

COD Catch in numbers (Millions) Yearclass 1988

COD IGFS index vs. VPA estimate of age group R 2 = IGFS-Index VPA

COD Estimated 4+ biomass by different assessment models.

COD Probability plots of estimated fishable biomass in