Estimation of Oyster and Scallop Production Based on Aquaculture Facility Surveys in Jaran Bay

This study estimated the production of oysters and scallops in Jaran Bay during the early harvest season (October–December) from 2018 to 2020, based on aquaculture facility surveys. Surveys were conducted with over 65% of the total license holders each year. The facility scale for oysters showed a gradual decrease, while that for scallops showed an increasing trend. Consequently, oyster production declined steadily over the period. For scallops, production plummeted to 2,762.1 tons in 2019 due to mass mortality —during which estimation was supplemented by social surveys instead of biological measurements—before recovering in 2020. However, despite a 28.2% increase in scallop facilities in 2020 compared to 2018, production remained nearly stagnant (0.2% increase) due to a significant reduction in the growth coefficient (b_y). This study presents a methodology for estimating production based on actual field measurements, aiming to complement the uncertainties of existing statistical data and provide foundational data for efficient fishery management and supply-demand regulation policies.