ENVIRONMENTAL VARIABILITY ASSOCIATED WITH EASTERN LITTLE TUNA [Eutynnus affinis (Cantor, 1849)] CATCHES: A CASE FOR THE NORTH INDRAMAYU WATERS, JAVA SEA

Syamsuddin, Mega L.; Sunarto, Sunarto; Yuliadi, Lintang Permata Sari

doi:10.11113/jt.v78.8195

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…Since few rivers discharge into the Indian Ocean, there is a collective water volume flux roughly two orders smaller than that into the Indonesian seas [25]. As a result, the role of river discharge is assumed to be important only within the Indonesian seas [26], which results in fish catches peaking during the northwest monsoon seasons in the Java Sea [27,28]. Marine primary production can be retrieved from satellite observations of solar-induced chlorophyll fluorescence [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Satellite-Observed Multi-Scale Variability of Sea Surface Chlorophyll-a Concentration along the South Coast of the Sumatra-Java Islands

Wei

et al. 2021

Remote Sensing

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The southern coast of Java is known as one of the most productive fishing grounds for tuna, feeding by nutrient-rich water along the coast caused by the subsurface water upwelling. This primary productivity can be evidenced by the high sea surface chlorophyll-a concentration (SSC). Based on satellite remote sensing products, we investigate the multi-scale variability in SSC along the Sumatra-Java coast. The results show that seasonal variability of SSCs is primarily due to monsoon-driven upwelling and rainfall in the Indian Ocean and Indonesian seas sides of the Sumatra and Java Islands, respectively. Local Ekman pumping plays a secondary role, while rainfall input to the ocean has little effect. Coastally trapped Kelvin waves and mesoscale eddies are responsible for the intraseasonal SSC anomalies in regions along the south coast of Java and off the Sunda and Lombok Straits, respectively. The interannual variability in SSC is caused by the anomalous upwelling related to the Indian Ocean Dipole. There was a weak increasing trend of ~0.1–0.2 mg/m3 per decade, above the global averaged trend, which may be related to enhanced local Ekman pumping. These analyses provide an overall description of SSC variations based on satellite observations; however, further investigations based on in situ observations are needed to achieve better quantification.

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Section: Introductionmentioning

confidence: 99%

Satellite-Observed Multi-Scale Variability of Sea Surface Chlorophyll-a Concentration along the South Coast of the Sumatra-Java Islands

Wei

et al. 2021

Remote Sensing

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“…The dynamics of the environmental variability are influenced by climate variations and thus affect the distribution of Eastern Little Tuna [11]. Figure 3 Figure 3a shows the monthly average CPUE for Eastern Little Tuna in the MS.…”

Section: Mean Monthly Climatological Oceanographic Parametersmentioning

confidence: 99%

“…Meanwhile, 1.027 fishing activities were carried out during La Niña with a mean CPUE of 23.56 kg/trip. Eastern Little Tuna catches varied significantly during the ENSO event due to changes in the environment [11]. The La Niña events caused an increased in Eastern Little Tuna catch rates and decrease during El Niño.…”

Section: Variation In the Spatial Distribution Of Eastern Little Tunamentioning

confidence: 99%

“…It has been established that the ENSO cycle causes warm (El Niño) and cool (La Niña) phases that have an impact on the Pacific Ocean's tuna fishing yields [9,10]. Previous research investigated how the ENSO IOP Publishing doi:10.1088/1755-1315/1289/1/012007 2 variability affects environmental variability and their relationship with Eastern Little Tuna in the Java Sea [11].…”

Section: Introductionmentioning

confidence: 99%

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Variation in Eastern Little Tuna (Euthynnus affinis) catches related to El Niño Southern Oscillation (ENSO) events in the Makassar Strait

Syamsuddin,

Puspita,

Syamsudin

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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In order to determine how the El Niño Southern Oscillation (ENSO) affects Eastern Little Tuna catch rates in the Makassar Strait (MS), satellite-derived oceanographic variables, including sea surface temperature (SST), chlorophyll-a, salinity, sea surface height (SSH), ocean current, Niño index 3.4, and Eastern Little Tuna (Euthynnus affinis) catch data were used. Analyses were conducted for a seven-year period (January 2015-December 2021), which included the El Niño (2015) and La Niña (2021) events. A higher CPUE value is obtained in 2021 when La Niña occurs with a CPUE value of 3973 kg/trip, compared to the El Niño event. Based on seasonal variations, the highest catch was recorded during the northwest monsoon (706.02 kg/trip) with 2789 fishing points, while the lowest occurred during the southeast monsoon (700 kg/trip) with 2942 fishing points. The CPUE was 16.25 kg/trip with 1133 fishing points during El Niño and 23.56 kg/trip with 1027 fishing points during La Niña, respectively. The fishing grounds area was wider during the La Niña period, at 2 - 8°S and 115 - 120°E. This study revealed a strong impact of the La Niña events, significantly increasing Eastern Little Tuna catch in the MS.

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“…Pada penelitian ini, kejadian ENSO ditunjukkan dengan nilai Oceanic Nino Index (ONI) yang dikembangkan oleh NOAA. ONI dibuat berdasarkan analisis anomali Sea Surface Temperature (SST) tiga bulanan pada wilayah Nino 3.4 yaitu 5º LU -5º LS, 120 -170º BT (Abeysekera et al, 2019;Sarvina and Sari, 2017) SST pada wilayah Nino 3.4 telah banyak digunakan sebagai indikator variabilitas iklim di Indonesia (Pan et al, 2018;Surmaini et al, 2015;Syamsuddin et al, 2016). Penentuan fase ENSO berdasarkan indeks ONI ditentukan pada threshold ± 0.5 o C. Tahun dengan nilai ONI ≥0.5 selama lima bulan berturut-turut didefinisikan sebagai tahun El-Nino, sebaliknya ≤-0.5 dianggap sebagai tahun La-Nina (Nabilah et al, 2017;Surmaini et al, 2015).…”

Section: Metode Penelitianunclassified

Potential of Green Leafhopper Attack (Empoasca sp.) in Tea Plantation Based on Climate Change Scenarios

Adelianingsih¹,

Hidayati²,

Sugiarto³

2019

J.Agromet

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Pest growth is closely related to the climate conditions. This study aimed to analyze the impact of climate variability and climate change on the potential attack of green leafhopper (Empoasca sp.) on tea plantations at PTPN VIII Gunung Mas. The analysis was carried out to calculate the value of Ecoclimatic Index (EI) based on the functions of the compare years and the compare location in CLIMEX model. Pest suitability in the future was projected using RCP 4.5 and 8.5 climate scenarios, which were derived from MIROC 5 and CCSM 4 climate model outputs. The result indicated that Gunung Mas Tea Plantation was suitable for Empoasca sp. growth. The EI value (58) in the baseline year (2012-2017) confirmed the suitability. Climate variability influences the suitability for Empoasca sp. growth. During El-Niño, the EI value decrease substantially (~26%). On the other hand, the EI value is projected to slightly increase in the future for both climate scenarios.

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ENVIRONMENTAL VARIABILITY ASSOCIATED WITH EASTERN LITTLE TUNA [Eutynnus affinis (Cantor, 1849)] CATCHES: A CASE FOR THE NORTH INDRAMAYU WATERS, JAVA SEA

Cited by 3 publications

References 9 publications

Satellite-Observed Multi-Scale Variability of Sea Surface Chlorophyll-a Concentration along the South Coast of the Sumatra-Java Islands

Satellite-Observed Multi-Scale Variability of Sea Surface Chlorophyll-a Concentration along the South Coast of the Sumatra-Java Islands

Variation in Eastern Little Tuna (Euthynnus affinis) catches related to El Niño Southern Oscillation (ENSO) events in the Makassar Strait

Potential of Green Leafhopper Attack (Empoasca sp.) in Tea Plantation Based on Climate Change Scenarios

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