• Energy Research

Thousand Islands has become the main focus of the marine tourism development in Special Capitol Region of Jakarta (DKI Jakarta). In this regard, one of the marine tourism objects proposed to be further developed is historical shipwreck diving as a new marine ecotourism attraction in the Thousand Islands. The historical sites of shipwrecks that are widely scattered underwater are expected to give added value to the beauty of underwater panorama because most of the sites have been covered with coral reefs adding to the uniqueness to the underwater diving attractions. However, the high activity on the North Coast of Java area and surrounding islands tends to affect the water quality and the presence of shipwrecks assuming it will be used for the development of diving tourism. This study aims to determine the carrying capacity of water quality on shipwrecks based on in situ water quality measurement and image analysis. The method of data collection and analysis carried out is a combination of in situ measurements at the location; analysis of water samples with laboratory testing and analysis of Landsat 8 satellite imagery. The result showed that nutrient and orthophosphate values of nitrate, which supported the life of marine biota and micro-algae that helped the biota’s biofouling process, increased the site’s attractiveness from 0.094 – 0.101 mg/L and 0.005 – 0.008 mg/L, respectively. Furthermore, other water quality values measured are still in accordance with quality standards for marine life survival on shipwrecks and ecotourism, especially dive spots with clear water visibility.

AbstractSeagrass meadows are an important component of coastal ecosystems globally, and they capture and store organic carbon in living biomass and sediments. Geographical estimates of blue carbon in seagrass habitats are regionally biased, with limited information from the Indo-Pacific region, including Indonesia. Seagrass extent in Indonesia is declining rapidly, and it has been suggested that marine protected areas (MPAs) are an important instrument to support protection of seagrass ecosystems and their services. Thus, this study is aimed at quantifying and comparing sedimentary carbon stocks and sources of organic carbon from seagrass meadows located in undisturbed areas outside MPA, disturbed areas outside MPA, and within MPA in three small islands in Indonesia. The sediment carbon stocks from this study ranged from 19.81 to 117.49 Mg C ha−1, with the highest stock measured inside MPA (77.15 ± 1.38 Mg C ha−1), followed by undisturbed outside MPA (36.08 Mg C ha−1), and the lowest stock at disturbed outside MPA (21.86 ± 0.31 Mg C ha−1). The predominant source of organic carbon in disturbed meadows was from coastal POM (particulate organic matter, ~ 36%), while in MPA and undisturbed sites, the main source was from seagrass, with ~ 38% and ~ 60% contributions, respectively. The results of this study add more data and information on seagrass blue carbon potential from three different islands with different degrees of disturbance in Indonesia.

Abstract The fishing port is an important supporting facility for achieving high-quality of fishery production. Maintaining the quality of fishery products is needed by optimizing the function of fishing ports as they are the cutting edge and a prime mover in the management and utilization of fish resources and port environment, ranging from preproduction, production, processing, and marketing. On the other hand, the fishing port has various environmental problems such as waste management, water quality degradation and liquid waste management. The objective of this study is to identify the solid waste input to a fishing port by using remote sensing approach. The research was conducted in Karangantu Fishing Port (Pelabuhan Perikanan Nusantara Karangantu), located in Serang, Banten. This study shows that the high-resolution satellite imagery was proven to be able to estimate the solid waste input to the fishing port area. The result shows that solid waste input to Karangantu Fishing Port was estimated to be 142.95 tons in 2020, which was derived from office activities, shipping activities, and tourist activities surrounding fishing port area. The method approach from this study is expected to support environmental management in the other fishing port areas.