Application of Schaefer model on mackerels fishery in Aceh waters, Indonesia

The mackerels were grouped into pelagic fish associated with oceanic habitat. Its exploitation in Aceh waters is quite intensive but not yet information related to its stock status. This information is needed in taking action on fisheries management with a quota approach. This study aims to assess of monthly production of mackerels tuna and maximum sustainable yield. This study deal with the estimation of catch and effort at maximum sustainable yield (MSY) of mackerels based on catch per unit effort (CPUE) and production of purse seine fishery in Banda Aceh during 2013-2018. Analysis was carried out using an equilibrium approach with the Schaefer model. The result showed that the average CPUE of purse seine for mackerels is 0,556 tonnes/trip. Since 2015 to 2018, the trend of biomass continued to decline and the over-fishing applied in this period. The catch at MSY of mackerels was 1506 tonnes/year and the effort at MSY was 2517 trips/year.