Abstract
Shortfin scad (Decapterus macrosoma) is an essential economic fish resource that spreads over tropical and subtropical oceans and is mostly caught in Bali Strait. High market demand for this fish leads to an increase in fishing efforts. In contrast, uncontrolled fishing efforts will threaten its sustainability and economic potential. This research was conducted based on catches during February – March 2020 for total samples of 1,115 fish and catch-effort time series secondary data (2008-2019). Length-weight data were analyzed using linear regression. The utilization level is predicted using the surplus production model analysis, Schaefer and Fox models, to estimate maximum sustainable yield (MSY). Results informed that based on Fox model analysis, values of sustainable catch (YMSY), optimum fishing effort (fopt), and total allowable catch (YTAC) were 1,585 tons/year, 1,782 trips/year, and 1,268 tons/year, respectively. The utilization rate value was 125%. An increase in fishing efforts led to the excess amount of catch over the MSY level. In addition, based on length-weight relationship analysis, the growth pattern of shortfin scad (D. macrosoma) was found negative allometric with equation W = 0.0175 L2.776. In conclusion, the fish has a fat body shape, and the stock is in overfishing condition.
Highlights
Shortfin scad (Decapterus macrosoma) comes from the Carangidae family, which is included in the genus Decapterus and is an important economic fish resource that spreads in overworld waters, both tropical and subtropical
In Bali Strait, according to data given by Pengambengan Archipelago fishing port (AFP), the amount of shortfin scad (D. macrosoma) landed gradually increased from 1,273 tons in 2008 to 3,757 tons in 2019
The Maximum Sustainable Yield (MSY) curve of the Schaefer model (1954) shows that the production and effort of shortfin scad (D. macrosoma) in the 12 years (2008-2019) landed in Pengambengan AFP has reached overexploited with a utilization rate of 101%
Summary
Shortfin scad (Decapterus macrosoma) comes from the Carangidae family, which is included in the genus Decapterus and is an important economic fish resource that spreads in overworld waters, both tropical and subtropical. This fish was found to dominate the over fisheries management area (FMA) of Indonesia with shallow waters conditions and lower salinity [1] [2]. Shortfin scad (D. macrosoma) is one of several fish species that dominate the catch of purse seines This species is an economic fisheries resource that is affordable and in demand by the community. The increased demand for shortfin scad (D. macrosoma) can trigger fishermen to increase their fishing efforts [5]
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