Estimation of fish biomass around the Sangihe Islands waters based on the acoustic data and numerical model of spatial ecosystem and population dynamics

The Sangihe Islands is located in the Republic of Indonesia Fisheries Management Area (WPPNRI) 716, which has an area of about 52.5 million hectares. The potential productions for small and large pelagic fish in WPP NRI 716 are 332,635 tons/year and 181,491 tons/year, respectively, with utilization...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2023-05, Vol.1163 (1), p.12010
Main Authors: Setiawan, Agus, Supriyadi, Freddy, Fadli, Muhammad
Format: Article
Language:English
Subjects:
Acoustics
Biomass
Dominant species
Echo sounding
Fish
Fisheries
Fisheries management
Fishing vessels
Islands
Mackerel
Mathematical models
Numerical models
Population dynamics
Purse seines
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Summary:The Sangihe Islands is located in the Republic of Indonesia Fisheries Management Area (WPPNRI) 716, which has an area of about 52.5 million hectares. The potential productions for small and large pelagic fish in WPP NRI 716 are 332,635 tons/year and 181,491 tons/year, respectively, with utilization rates of 0.48 and 0.63. The dominant fish species caught were skipjack, mackerel, yellowfin tuna, and anchovies. In order to estimate fish biomass around the Sangihe Islands waters, acoustic data has been collected in several locations using a 120 kHz BIOSONIC DT-X echo sounder mounted on fishing vessels with purse seine gear. In addition, an analysis of the data from the results of the Spatial Ecosystem and Population Dynamics Model (SEAPODYM) from INDESO Project was also carried out. This model has a resolution of 1/12° and applied in Indonesian waters for 3 types of tuna, namely yellowfin, bigeye, and skipjack. Acoustic data showed that the largest fish biomass along the survey tracks was found at depths between 126 and 150 m, with a total biomass of 21,418 tons. Meanwhile, from the model results, it was found that skipjack biomass was the largest. The average biomass around the Sangihe Islands waters was around 1,340 tons.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1163/1/012010