Research Document - 2012/029

Canadian Biomass Reference Points for Eastern Georges Bank (5Zjm) Haddock

By Y. Wang and L. Van Eeckhaute

Abstract

The Terms of Reference for the 2012 Maritimes Region Reference Point Regional Peer Review requested that a Limit Reference Point (LRP) and an estimate of B_MSY be developed for Eastern Georges Bank (EGB; unit areas 5Zj and 5Zm) haddock. The methodology for calculating LRP and Spawning Stock Biomass at MSY (SSB_MSY) for Eastern Georges Bank haddock were reviewed at the meeting.

Based on the conclusion that EGB haddock has not experienced productivity regime changes during 1931 to 2011, the long-term time series for weights at age and recruit/SSB and population weighted partial recruitment from 1995 (when gear changes were introduced) to 2010 were used for the reference point calculations. SSB_MSY was calculated using the Sissenwine-Shepherd production model to be 78,000 mt with a 95% confidence interval of 60,000 mt to 91,000 mt. The LRP, based on B_recover, was determined to be 10,340 mt with a 95% confidence interval of 10,250 mt to 10,430 mt. These recommendations were accepted at the 2012 Maritimes Region Reference Point Regional Peer Review meeting.

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