Estimating the standing biomass of demersal fish in Ninh Thuan waters by swept area method
Abstract
In order to estimate the biomass of demersal fish in Ninh Thuan waters to support allocating exploitation quotas, the area method was used. Four survey trips by trawler were conducted at 30 stations during the Southwest and Northeast monsoon seasons in 2022 and 2023. Research results pointed out the catch-per-unit-effort (CPUE) fluctuated greatly between survey stations. CPUE in inshore areas is higher than in coastal areas, CPUE in the southwest monsoon season is higher than in the northeast monsoon season. The catch-per-unit-area (CPUA) of fish also varied widely between survey stations and was mainly concentrated in inshore areas. CPUA in the southwest monsoon season is higher than in the northeast monsoon season. The standing biomass of demersal fish in Ninh Thuan waters was estimated at 6,088 tons, of which biomass of coastal area account for 9.5% (576 tons), and the biomass of inshore areas account for 90.5% (5,512 tons).
