scholarly journals DISTRIBUSI - KELIMPAHAN DAN HASIL TANGKAPAN CUMI-CUMI DI PERAIRAN PAPARAN SUNDA BAGIAN SELATAN: berbasis pada perikanan Jaring Cumi yang mendarat di Muara Angke dan Kejawanan

2019 ◽  
Vol 25 (4) ◽  
pp. 225
Author(s):  
Suwarso Suwarso ◽  
Achmad Zamroni ◽  
Moh Fauzi
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Target Species ◽  
The South ◽  
Sunda Shelf ◽  
Abundance Index ◽  
China Sea ◽  
Java Sea ◽  
Karimata Strait

Perikanan cumi-cumi telah berkembang di Laut Jawa dan Laut Cina Selatan, didukung oleh alat tangkap bouke ami dan cast net dengan armada penangkap skala menengah. Perikanan berkembang sebagai bentuk diversikasi usaha penangkapan beralih target species akibat terjadinya pergeseran trophic level yang berkaitan dengan perubahan ekosistem serta indikasi pergantian populasi dari sumberdaya ‘multi-species’. Kajian distribusi, kelimpahan dan hasil tangkapan Cumi-cumi (Loliginidae) di perairan Paparan Sunda bagian selatan didasarkan pada data monitoring oleh enumerator tahun 2018 terhadap alat penangkap cumi-cumi (bouke ami dan cast net), didukung oleh data pendaratan per kapal di TPI Muara Angke (Jakarta) periode 2012-2018 dan TPI Kejawanan (Cirebon) periode 2008-2018. Observasi lapangan ditujukan untuk mendeskripsikan karakteristik armada, alat tangkap dan aspek operasional penangkapan. Hasil menunjukkan daerah penangkapan cumi-cumi di Paparan Sunda bagian selatan tersebar luas di Laut Jawa dan Laut Cina Selatan, tapi lebih terkonsentrasi di perairan selatan Selat Karimata yang ditunjukkan oleh tingginya intensitas penangkapan (54% dari total trip penangkapan). Namun demikian, secara umum kelimpahan cumi-cumi (ditunjukkan oleh indek kelimpahan CPUE dalam Kg/hari) hampir seragam sekitar 113-133 kg/hari, sedang indek kelimpahan (CPUE) dalam Kg/trip terlihat berbeda. Perbedaan nyata juga terlihat dari total hasil tangkapan cumi-cumi dari Selat Karimata yang mencapai 55% dari total pendaratan cumi-cumi dari paparan tersebut. Secara umum sebagai target species cumi-cumi berkontribusi sebanyak 93% dari total hasil tangkapan pada alat penangkap cumi. Trend kenaikan hasil tangkapan cumi-cumi berlangsung hingga saat ini baik di Muara Angke maupun Kejawanan. Dalam komposisi jenis prosentase cumi-cumi juga menunjukkan semakin tinggi pada hasil tangkapan pukat (cantrang). Hal-hal terkait pengelolaan perikanan cumi sebagai diversifikasi usaha penangkapan dan pengalihan target species juga dibahas.Squids fishery had well developed in the Java Sea and the South China Sea, was supported by the bouke ami and cast net that were using the medium scale boats. The fisheries developed as the fishing diversification over the species target as an impact of the tropic level changes correspond to the ecosystem changes and substitution of fish population from ‘multi-species’ fish resources. Study of distribution, abundance and catch of squid (Loliginidae) in the southern of Sunda Shelf waters was carried out based on daily monitoring data by enumerators (enumeration data) in 2018 of squid fishing gears (bouke ami, cast net and squid fishing) supported by 201 squid landing data at TPI Muara Angke (Jakarta) for the 2012-2018 period and TPI Kejawanan (Cirebon) for the 2008-2018 period. Field observations are intended to describe the characteristics of the fleet, fishing gear and operational aspects of capture. The results showed that the squid fishing area in the southern part of Sunda Shelf was widespread in the Java Sea and the South China Sea, but concentrated in the southern of Karimata Strait as indicated by the high intensity of catch (54% of the total fishing trips). However, in general the abundance of squid (indicated by the CPUE abundance index in kg / day) is almost the same, which is around 113-133 kg / day, while the abundance index (CPUE) in kg / trip looks different. Significant differences were also seen from the total catch of squid from the Karimata Strait which reached 55% of the total squid landings from the Shelf. The catch of squid that occurred until now shows an upward trend, this is as recorded in Muara Angke and Kejawanan. In catch composition, the percentage of squid also showed higher catches on trawlers (cantrang). Matters related to the management of squid fisheries as a diversification of fishing effort and diversion of target species are also discussed.

Observed Water Exchange Between the South China Sea and Java Sea Through Karimata Strait

2021 ◽  
Vol 126 (2) ◽  
Author(s):  
T. F. Xu ◽  
Z. X. Wei ◽  
R. D. Susanto ◽  
S. J. Li ◽  
Y. G. Wang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Water Exchange ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Java Sea ◽  
Karimata Strait

scholarly journals GEOGRAPHICAL DISTRIBUTION AND STATUS OF SCADS POPULATION IN THE WATERS OF THE SOUTHERN PART OF THE SUNDA SHELF

2017 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
Suherman Banon Atmaja ◽  
Duto Nugroho
Keyword(s):  
South China Sea ◽  
Geographical Distribution ◽  
South China ◽  
The South China Sea ◽  
Purse Seine ◽  
The South ◽  
Offshore Water ◽  
Sunda Shelf ◽  
China Sea

The scads population have long been exploited in ldonesia Exploitation to the offshore water started when purse seine was introdused in 1970. The exploitation extends eastwards to the Macassar Strait and nonhwards to the southern part of the south china sea.

An overview of 10-year observation of the South China Sea branch of the Pacific to Indian Ocean throughflow at the Karimata Strait

2019 ◽  
Vol 38 (4) ◽  
pp. 1-11 ◽  
Author(s):  
Zexun Wei ◽  
Shujiang Li ◽  
R. Dwi Susanto ◽  
Yonggang Wang ◽  
Bin Fan ◽  
...  
Keyword(s):  
Indian Ocean ◽  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
The Pacific ◽  
Karimata Strait

scholarly journals Tidal elevation, current, and energy flux in the area between the South China Sea and Java Sea

Ocean Science ◽  
2016 ◽  
Vol 12 (2) ◽  
pp. 517-531 ◽  
Author(s):  
Zexun Wei ◽  
Guohong Fang ◽  
R. Dwi Susanto ◽  
Tukul Rameyo Adi ◽  
Bin Fan ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Tidal Energy ◽  
Tidal Currents ◽  
The South China Sea ◽  
China Sea ◽  
Tidal Waves ◽  
Energy Flows ◽  
Java Sea ◽  
Karimata Strait

Abstract. The South China Sea (SCS) and the Java Sea (JS) are connected through the Karimata Strait, Gaspar Strait, and the southern Natuna Sea, where the tides are often used as open boundary condition for tidal simulation in the SCS or Indonesian seas. Tides, tidal currents, and tidal energy fluxes of the principle constituents K1, O1, Q1, M2, S2, and N2 at five stations in this area have been analyzed using in situ observational data. The results show that the diurnal tides are the dominant constituents in the entire study area. The constituent K1 has the largest amplitude, exceeding 50 cm, whereas the amplitudes of M2 are smaller than 5 cm at all stations. The amplitudes of S2 may exceed M2 in the Karimata and Gaspar straits. Tidal currents are mostly of rectilinear type in this area. The semi-major axes lengths of the diurnal tidal current ellipses are about 10 cm s−1, and those of the semidiurnal tidal currents are smaller than 5 cm s−1. The diurnal tidal energy flows from the SCS to the JS. The semidiurnal tidal energy flows from the SCS to the JS through the Karimata Strait and the eastern part of the southern Natuna Sea but flows in the opposite direction in the Gaspar Strait and the western part of the southern Natuna Sea. Harmonic analysis of sea level and current observation also suggest that the study area is located in the antinodal band of the diurnal tidal waves, and in the nodal band of the semidiurnal tidal waves. Comparisons show that the existing models are basically consistent with the observational results, but further improvements are necessary.

scholarly journals Geophysics Appearance of The South China Sea

2021 ◽  
Vol 11 (2) ◽  
pp. 223
Author(s):  
Eddy Mirnanda
Keyword(s):  
South China Sea ◽  
South China ◽  
Bouguer Anomaly ◽  
The South China Sea ◽  
Crustal Rock ◽  
The South ◽  
Sunda Shelf ◽  
China Sea ◽  
Manila Trench ◽  
Free Air

<p class="AbstractText">South China Sea (SCS) is underlain by sediments of an average density 2.10 g/cm<sup>3</sup> of 2 km thickness at its central part up to 10 km in the margins. The basement rock is the upper and lower crust of densities 2.67 and 2.85 g/cm<sup>3</sup> respectively of varying thicknesses. The thinnest crustal rock is at the centre of SCS that is called the South China Sea Basin (SCSB). The Mohorovicic discontinuity is about 15 km depth below the SCSB. Heatflow values in this basin vary from 2 to 3.5 HFU.</p><p class="AbstractText">Lineations of total magnetic anomaly are generally in a west-east direction covering the whole study area. However, an elongated northeast-southwest lineation of dipole anomaly separates the west-east anomaly patterns in the north from those in the south. This feature is also observed in the gravity map. These elongated patterns of the total magnetic features are in coincident with the occurrences of seamounts inferred being remnant of extinct seafloor spreading. Because of this spreading a crustal extension had taken place that separated Kalimantan from the mainland of China to restore its present position. A paleomagnetic study result confirms this hypothesis.</p><p class="AbstractText">The Palawan trench is marked by north-east trending magnetic and gravity anomaly that is inferred being traces of a remnant subduction zone. This anomaly forms a boundary between the Zengmu also called the Sarawak basin and the SCSB. Here, heat flow value is 1 to 2 HFU. This value in coincident with gravity gradient of 2.5 mGal/km also represents an active subduction of the Manila trench north of the Palawan Island. The Manila trench is supposed to be the energizing source of volcanism and earthquake in the Phillippines. Free-air and Bouguer anomaly of the order of 50 to 60 mGal and magnetic of about 100 nT represent the Zengmu basin in the Sunda Shelf. This basin is underlain by sediments of 2.10 g/cm<sup>3</sup> of 8 km thickness and also crustal rock which is much thicker than the one underneath the SCSB. Strong topographic relief at the surfaces of sedimentary layer and the crustal rock is very my much associated with normal faulting that may cause fluctuation of the free-air values.</p><p class="AbstractText">The continental margins of Sarawak and the Sunda Shelf are areas of hydrocarbon deposits now still in production, whereas the offshores Vietnam and Hainan are promising target for hydrocarbon exploration.</p>

scholarly journals Tidal elevation, current and energy flux in the area between the South China Sea and Java Sea

2015 ◽  
Vol 12 (6) ◽  
pp. 2831-2861 ◽  
Author(s):  
Z. X. Wei ◽  
G. H. Fang ◽  
R. D. Susanto ◽  
T. R. Adi ◽  
B. Fan ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Tidal Energy ◽  
Tidal Currents ◽  
The South China Sea ◽  
China Sea ◽  
Tidal Waves ◽  
Energy Flows ◽  
Java Sea ◽  
Karimata Strait

Abstract. The South China Sea (SCS) and the Java Sea (JS) are connected through the Karimata Strait, Gaspar Strait, and the southern Natuna Sea, where the tides are often used as open boundary condition for tidal simulation in the SCS or Indonesian seas. Tides, tidal currents and tidal energy fluxes of the principle constituents K1, O1, Q1, M2, S2 and N2 at five stations in this area have been analyzed using in-situ observational data. The results show that the diurnal tides are the dominant constituents in the entire study area. The constituent K1 has the largest amplitude, exceeding 50 cm, whereas the amplitudes of M2 are smaller than 5 cm at all stations. The amplitudes of S2 may exceed M2 in Karimata and Gaspar Straits. Tidal currents are mostly of rectilinear type in this area. The major semi axis lengths of the diurnal tidal current ellipses are about 10 cm s−1, and those of the semi-diurnal tidal currents are smaller than 5 cm s−1. The diurnal tidal energy flows from the SCS to the JS. The semi-diurnal tidal energy flows from the SCS to the JS through the Karimata Strait and the eastern part of the southern Natuna Sea but flows in the opposite direction in the Gaspar Strait and the western part of the southern Natuna Sea. Harmonic analysis of sea level and current observation also suggest that the study area is located in the loop band of the diurnal tidal waves, and in the nodal band of the semi-diurnal tidal waves. Comparisons show that the existing models are basically consistent with the observational results, but further improvements are necessary.

scholarly journals DEMERSAL FISH RESOURCES RESULT OF MV. SEAFDEC 2 SURVEY IN THE SOUTH CHINA SEA OF INDONESIA

2017 ◽  
Vol 14 (2) ◽  
pp. 67
Author(s):  
Wudianto Wudianto ◽  
Bambang Sumiono
Keyword(s):  
South China Sea ◽  
Shallow Water ◽  
South China ◽  
Deep Water ◽  
Demersal Fish ◽  
The South China Sea ◽  
The South ◽  
Sunda Shelf ◽  
China Sea ◽  
Fish Resources

The South China Sea is belonging to western part of Sunda shelf which consisted of shallow water in the southern part and deep water in the northern part area. The area of Indonesian water in the South China Sea is estimated 595,000 km2 including exclusive economic zone waters.

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