Hafró "leišréttir" lélegt vorrall meš įrsgömlum gögnum og bętir ķ žorskkvótann.

Ég var bśinn aš spį samdrętti ķ žorskafla vegna žess aš vķsitalan śr vorrallinu lękkaši milli įra (sjį sķšustu fęrslu). En nś bętir Hafró 3% viš žorskkvótann. Hvaš lį žar til grundvallar? Skżringin fannst ķ vinnuskżrslu Norš- vestur vinnuhópsins.

Žar segir aš tölfręši śr vorralli gefi til kynna breytingar ķ veišanleika (hm!). Žvķ er fariš ķ aš nota nišurstöšur śr haustralli įsamt VP greiningu į afla įrsins 2017 til aš reikna śt stofnstęršina. Sem sagt, nota įrsgömul gögn til aš "leišrétta" nżjasta vorrall. Ef vorralliš hefši veriš notaš eingöngu hefši žaš gefiš 1162 žśs. tonna stofn, haustrallli ķ fyrra eitt sér mat stofninn 1428 žśs. tonn, sameinuš nišurstaša varš svo 1356.509 tonn.

Žaš vantar nś ekki upp į nįkvęmnina.

Hér er klipp śr skżrslunni:

Diagnostics: The tuning with both the spring and the fall survey show similar diagnostics as that observed in previous years (see Tables 9.8, 9.9 and 9.10 and Figure 9.6 for the residuals). A negative residual block for spring survey indices age groups 2 to 5 in recent years may indicate that there may have been some change in catchability.

Results: The detailed result from the assessment are provided in Tables 9.11, 9.12 and the stock summary in Table 9.13} and Figure 9.7. The reference biomass is estimated to be 1356.509 kt in 2018 and the fishing mortality 0.26 in 2017.

Alternatives: Assessment based on tuning with the spring and the fall survey separately have in recent years shown that the fall survey gives a higher estimate than the spring survey (Figure 9.8). Tuning with spring survey only this year resulted in a reference biomass of 1162 kt in 2018 and a fishing mortality of 0.3 in 2017. An assessment based on the fall survey only gave reference biomass of 1428 kt in 2018 and fishing mortality of 0.25 in 2017. Mohn’s rho: One of the ToR for this year was to evaluate the retrospective pattern of the assessment (Figure 9.9) by calculating the Mohn’s rho values.
 

 


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