A stock assessment of small yellow croaker by Bayesbased PellaTomlinson model in the East China Sea

Abstract:

The fish stock assessment is important groundwork for presentday fish stock management.The report presents a stock assessment of small yellow croaker in East China Sea by Bayesbased PellaTomlinson model,and a forecasting of biomass and catch from different fisheries policy in 2003-2020. All of the data used in this study are from the monitoring for fisheries resources in East China Sea.The research results show that the carrying capacity K is 410 281tons and the intrinsic growth rate r is 1.129;the estimated stock biomass increased from approximately 332 654 tons in 1991 to 370 923 tons in 1994 and then declined to the minimum 131 416 tons in 2003;the estimated MSY is 110 000tons; the estimated biomass for achieving MSY is about 200 000 tons ;the estimated effort for achieving MSY is 1 373 380 nets; the stock depletion level (Bcur/K ) is about 0.319, i.e. the current biomass is less than by 40 per cent of the initial biomass;if using less than 0.4 of fishing mortality after 2004, this will bring about an optimal utilization to the fishery.