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Turkish Journal of Fisheries and Aquatic Sciences 2018, Vol 18, Num, 3     (Pages: 359-366)

Comparison of Catch and Survey Data for Assessing Northern Shrimp (Pandalus borealis) from Arnarfjordur (NW-Iceland) Using a Stock Production Model

Suman Barua 1 ,Gudmundur Thordarson 2 ,Ingibjorg G. Jonsdottir 3

1 Marine Fisheries Office, Department of Fisheries, Chittagong, Bangladesh and Fellow of UNU-FTP, Iceland
2 Marine Research Institute (MRI), Fisheries Advisory Section, Iceland
3 Marine Research Institute (MRI), Marine Resources Section, Iceland
DOI : 10.4194/1303-2712-v18_3_01 Viewed : 309 - Downloaded : 210 Catch Per Unit Effort (CPUE) data and survey biomass indices of Arnarfjordur (NW-Iceland) shrimp stock (Pandalus borealis) were used as tuning series for a Surplus Production Model (SPM) fitted using three different types of software. It is observed that many of the model assumptions in the SPM are violated in this analysis. The average estimation of MSY, BMSY and FMSY among the software platforms were 776 t, 2977 t and 0.18 respectively for survey series, and 1109 t, 2195 t and 0.51 respectively for CPUE series. The interaction of relative fishing mortality over relative biomass for survey data is relatively more realistic based on empirical observation where fishing intensity, predation by cod and effect of physical parameters on the shrimp stock were revealed by many researchers. It is concluded that survey or fisheries independent data is more reliable than catch data or fisheries dependent data. Keywords : Stock production model, Iceland, Pandalus borealis, CPUE data, survey data