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Seasonal Variations of Sea Surface Temperature and Sea Current in the Celebes Sea

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Hapsari S. N., Syamsuddin M. L., Riyantini I., Sunarto S.
World News of Natural Sciences
|
2021
|
vol. 35
135-143
EN
The waters of the Celebes Sea are an area that has quite complex dynamics because it is influenced by several factors, either regionally or globally. This influence certainly has an impact on variations in oceanographic conditions in waters such as Sea Surface Temperature (SST) and sea currents. Currently, there are many observations of oceanographic data, one of which is by using remote sensing methods. The purpose of this study was to determine the seasonal variations in sea surface temperature and sea surface currents in the Celebes Sea using a remote sensing system in a time series for 5 years (2014-2018). The results of this study indicate data on seasonal variation of SST and sea surface currents have an average maximum SST value for 5 years occurring in the eastern season and the second transitional season (May, June, July) with an average value range of 30.6 °C - 31.1 °C and the average maximum sea current velocity for 5 years occurs in the western monsoon with a value range of 0.72 m/s - 0.77 m/s. The high SST value and sea current velocity are caused by the influence of the season which causes variations in the ongoing rainfall, also presumably due to the opposite direction between the monsoon wind and the direction of the main current flowing in the Celebes Sea.
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Diseases prevalence of Acropora corals: Study on Semak Daun Island, Seribu Islands, Jakarta

100%
Harahap S. A., Fadhil F., Sunarto S.
World News of Natural Sciences
|
2021
|
vol. 34
113-126
EN
Coral reefs have undergone significant degradation as a result of the impact of human disturbance and natural factors on biodiversity and ecosystem function. The impacts ranged from an increase in the appearance of coral bleaching, coral disease, to coral death. Especially for coral disease, it is confirmed that it has contributed to the reduction of live coral cover and the productivity of coral reef ecosystems. The coral disease can be epidemic due to environmental pressures, both anthropogenic and natural, as well as infection from pathogenic microbes. Recently in several places, including Semak Daun Island, Seribu Islands-Jakarta, it was reported that the condition of coral reef cover had increased. However, a high percent of coral cover can increase disease prevalence and abundance. Acropora coral is a type of coral that is commonly found on Semak Daun Island. However, these corals are very susceptible to stress so that the threat of disease is high. So it is necessary to conduct a study that aims to determine the type and prevalence of diseases that disturb Acropora coral in Semak Daun Island, Seribu Islands, Jakarta. The field survey was carried out for coral observation using the line transect method at four stations. Coral disease identification refers to the Coral Disease Handbook and Underwater Cards for Assessing Coral Health. Observation objects, both coral species, and signs of disease were documented using underwater cameras. The study results indicate that 15 types of Acropora corals were dominated by A. humilis. Meanwhile, two groups of diseases were found, namely Tissue loss - Predation caused by the COTS and Drupella, while those from the Compromised Health group included RFA, SD, and Sponges.
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Catch Comparison and Rate of Floating Liftnet at Different Time of Hauling in Pangandaran, West Java, Indonesia

100%
Apriliani I. M., Dwipayana M. F., Sunarto S., Rostini I.
World News of Natural Sciences
|
2019
|
vol. 22
168-173
EN
Pangandaran fishermen use various types of fishing gear to catch fish, one of which is a liftnet. Floating liftnet fishing in Pangandaran is usually carried out at night, especially during dark months so that fish and cructaceans can gather in the area, as such animals are attracted to light (positive phototactic properties). These animals are deemed pelagic as they live on the surface of the waters. The weight and number of catch by fishermen are different depending on the time of hauling. Based on this, it is necessary to conduct research on the effect of the time of hauling on the floating liftnet catch. Accordingly, the optimal hauling time for floating liftnet fishing in Pangandaran was after midnight into early morning (00.00-04.00) and the average total catch is 386.12 kg. The main catch is mostly jawla paste shrimp and squid shrimp with a catch rate of 92.9 kg / hour.
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