Jurnal Ilmu dan Teknologi Kelautan Tropis
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ANALYSIS OF THE SEASONAL IMPACT ON ISOTOPIC BASELINES OF DISSOLVED INORGANIC CARBON (DIC) IN COASTAL WATERS SPERMONDE, SOUTH SULAWESI
Get PDFStable carbon isotopes have been commonly used as indicators for assessing environmental changes in aquatic ecosystems. They can be used to study the dynamics of organic matter as for understanding the overall functioning of the ecosystem, the connectivity of estuaries with terrestrial and marine coastal habitats. The objective of this study is determining the seasonal natural effects over isotopic (13C/12C) baselines in monitoring CO2 storage in dissolved inorganic materials in Spermonde waters on the west coast of South Sulawesi to some outermost island. The results show that the stable carbon isotopic of DIC (d13C-DIC) in the wet season varied between -5.36 ‰ and -7.74 ‰. These value are higher than on dry season (-4.34 ‰ to -6.82 ‰). Likewise, DIC concentration in the rainy season ranged between 9.5 mg C/L and 11.7 mg C/L, while in the dry season it varied from 8.5 mg C/L to 9.3 mg C/L. The d13C-DIC and DIC concentrations decreased towards offshore, up to some of the outer islands. Increasing in the d13C-DIC in Spermonde waters indicate that the DIC is most likely enriched by atmospheric CO2(g), which is outnumbered those of aquatic photosynthesis. This study shows that different levels and composition of d13C-DIC stretch along different rivers are attributable to the varying landscapes and quality of organic matters
ID THE MANTA : MANTA SIGHTINGS IN MANTA SANDY - RAJA AMPAT, WEST PAPUA-INDONESIA
Get PDFManta ray (Mobula alfredi and Mobula birostris) is an endangered species that protected by international and national law. This species is vulnerable because of commercial fisheries and anthropogenic threats. These threats have impacted the species population worldwide. Raja Ampat is home for both species of the manta ray, and the area is protected with conservation status. Manta Sandy is located in Dampier Strait, is a popular dive site in Raja Ampat visited by thousands of tourist per year. It is vital to ensure the manta sightings in this area to maintain the tourist volume for local economic benefits. Utilization of photo ID and mark-recapture technique conducted to document the spots on the belly of manta ray that identify a unique pattern of each fish. This study conducted in low season from July to August 2018 for 15 days from 08.00-16.00 used two cameras of go pro hero 4 with extra battery power. The result documented time of manta sightings and species characteristic (size, sex, species, behavior, and color morphology). The camera trap recorded four manta rays where the two of them were new identified individuals
THE IMPACT OF OCEANOGRAPHIC PARAMETERS CHANGES ON THE DISTRIBUTION AND ABUNDANCE OF SKIPJACK TUNA Katsuwonus pelamis IN MAKASSAR STRAIT
Get PDFThis study aimed to identify the changes of oceanographic parameters and to analyze the effects of the parameter changes on the distribution and abundance of skipjack tuna captured by purse seine fishing gear operated in Coastal Waters of Makassar Strait. This study collected fishing and field oceanographic data from May to October 2017. A survey method was used to obtain primary data (skipjack catch per unit effort/CPUE) and secondary data including sea surface temperature (SST) and Chl-a level 3 with a monthly temporal and spatial resolution of 4 km from 2007-2017, interview, and study literature. The data were processed by using SeaDAS and ArcGIS software packages and were analyzed by anomalies, standard deviation, and Generalized Additive Models (GAMs) analyses. The results showed there were anomalies for both SST and Chl-a near study area reflecting the significant changes in the oceanographic conditions. The changes for both SST and Chl-a were 1.5ºC and -0.97 mg.m-3 respectively. This study suggests that the Chl-a parameter has more significant effects on skipjack tuna distribution and CPUE than SST. Understanding of the areas of the oceanographic changes strongly supports the available habitat for the fishing operation and conservatio
LAND CARRYING CAPACITY FOR SETTLEMENT AND ITS IMPLICATIONS ON WATER QUALITY AT SMALL ISLANDS (CASE STUDY OF TIWORO STRAIT SMALL ISLANDS, WEST MUNA REGENCY)
Get PDFPulau-pulau kecil merupakan sebuah entitas yang memiliki keterbatasan untuk dimanfaatkan. Penelitian ini bertujuan untuk menganalisis daya dukung lahan untuk permukiman penduduk dan inplikasinya terhadap kualitas air di pulau-pulau kecil. Daya dukung lahan ditentukan berdasarkan analisis kebutuhan ruang minimum setiap individu sesuai Standar Nasional Indonesia (SNI) 03-1733-2004, sedangkan implikasinya terhadap kualitas air ditentukan berdasarkan pendekatan beban nutrien. Hasil penelitian menunjukkan bahwa Kepulauan Tiworo memiliki total potensi lahan sebesar 198,94 ha. Lahan yang telah dimanfaatkan sebesar 31,45 ha. Meskipun pemanfaatan lahan relatif tergolong kecil, namun terdapat pulau yang dimanfaatkan telah melebihi daya dukung. Kepadatan penduduk setiap pulau memiliki korelasi positif terhadap tingkat degradasi lahan. Total jumlah penduduk saat ini masih dapat ditolerir badan air, namun jika jumlah penduduk sesuai daya dukung lahan, akan meningkatnya rasio baku mutu amonia sebesar 0,086-0,550. Hal ini menunjukkan bahwa daya dukung lahan gugus Kepulauan Tiworo lebih besar dari kemampuan badan air dalam mengasimilasi limbah domestik.Small islands are an entity that has limitations to be used. This study aimed to analyze the land carrying capacity for settlement and its implication on water quality at small islands. The carrying capacity of land are determined based on an analysis of the minimum space requirements of each individual according to Indonesian National Standards (SNI) 03-1733-2004, while the implications for water quality are determined based on the nutrient load approach. The results of this research showed that the Tiworo archypelago have a total potential land approximately 198.94 ha and about 31.45 ha of this amount has been utilized. Although the land use is relatively small, however, there are also islands that have been used to exceed their carrying capacity. The human population density of each island has a positive correlation with the level of the land degradation. The total population currently is still tolerated by water bodies, but when the population is suitable with the land carrying capacity will increase the ammonia ratio by 0.086-0.550. This indicates that the land carrying capacity of the Tiworo chained Islands is not higher than the ability of the water body in assimilating the domestic waste
SEX IDENTIFICATION THE DOG CONCH Strombus sp. ONLY MORPHOLOGY IN MADUNG WATERS, TANJUNGPINANG, INDONESIA
Get PDFIdentifikasi morfologi sebagai alternatif identifikasi jenis kelamin siput gonggong tanpa merusak cangkang dan viscera. Penelitian bertujuan untuk mengidentifikasi jenis kelamin siput gonggong Strombus sp. secara morfologi. Sampel diperoleh dari nelayan pengumpul di pesisir Madung, Tanjungpinang, Indonesia. Sampel dikoleksi pada saat surut terendah, hasil koleksi disimpan dalam wadah ember. Siput gonggong jenis kelamin jantan dan betina dibedakan secara morfologi melalui pengamatan visual terhadap cangkang tanpa pembedaan organ bagian dalam cangkang. Organ reproduksi diketahui dengan cara mengeluarkan keseluruhan daging dengan memecahkan cangkang. Panjang cangkang diukur menggunakan kaliper dengan ketelitian 0,01 mm. Panjang cangkang adalah jarak dari ujung anterior ke ujung posterior cangkang. Rasio jenis kelamin siput gonggong dianalisis dengan metode chi-square. Data yang diperoleh dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa siput gonggong yang ditemukan adalah jenis Strombus canarium dan Strombus sp. dari total sampel sebanyak 1124 individu. Jenis kelamin siput gonggong dapat ditentukan secara morfologi berdasarkan kemontokan cangkang (lebar dan langsing). Bentuk cangkang lebar menandakan siput gonggong jenis kelamin betina, bentuk cangkang langsing menandakan siput gonggong jenis kelamin jantan. Nisbah kelamin siput gonggong jenis S. canarium dan Strombus sp. jantan dan betina dalam rasio berbeda.Morphological identification as an alternative sex identification of dog conch without damaging the shell and viscera. The study aimed to identify the gender of the dog conch Strombus sp. by morphology. Samples were obtained from fishermen collecting dog conch on the coast of Madung, Tanjungpinang, Indonesia. Samples were collected by hand at low tide. To distinguish between male and female dog conch is done by looking at the shell structure morphologically without seeing the internal organs of the body shell. To see the gonads or reproductive organs is done by removing the whole dog conch by breaking the shell. The shell length was measured using by caliper a precision 0.01 mm. The length of the shell is the distance from the anterior edge to the posterior end of the shell. To know the sex ratio of dog conch type analyzed chi-square. The data obtained were analyzed descriptively. The results showed that of the total sample of 1124 individuals, obtained two types of dog conch are Strombus canarium and Strombus sp. The determination of the gender of morphological dog conch can be seen from the structure of the shell (width and slim). The wide shell shape signifies a female, a slim form of shell signifying a male. The sex ratio of dog conch type S. canarium and Strombus sp. males and females in different ratios
DAYA DUKUNG OPTIMUM BERBASIS POLA TATA GUNA LAHAN PESISIR DI MUARA GEMBONG KABUPATEN BEKASI
Get PDFABSTRAKPerubahan penggunaan lahan yang terjadi di Pesisir Kecamatan Muara Gembong telah mempengaruhi daya dukung lahan bagi penduduk setempat. Tujuan dari penelitian ini adalah untuk mengidentifikasi pola perubahan tata guna lahan saat ini di Kecamatan Muara Gembong, menganalisis tapak ekologi (ecological footprint) pemanfaatan ruang bagi masyarakat pesisir berdasarkan pola penggunaan lahan yang dikembangkan di Kecamatan Muara Gembong, serta menghitung daya dukung optimal pemanfaatan lahan wilayah pesisir kecamatan Muara Gembong. Analisis interpretasi citra digunakan untuk mengidentifikasi pola penggunaan lahan, sedangkan daya dukung dikaji melalui pendekatan Analisis Ecological Footprint (EF). Hasilnya menunjukkan bahwa penggunaan lahan di Muara Gembong didominasi oleh penggunaan lahan tambak (7.344 ha), sedangkan kategori penggunaan lahan yang paling sedikit di Muara Gembong adalah lahan mangrove (379 ha) dan ladang (372 ha). Nilai ecological footprint yang paling tinggi adalah perairan pesisir (2,95 ha/kapita), sedangkan EF terendah adalah lahan mangrove (10,09 x 10-4 ha/kapita). Hal ini menjadikan daya dukung lahan mangrove menjadi yang paling tinggi, sebaliknya daya dukung lahan yang paling rendah adalah daya dukung perairan pesisir. ABSTRACTLand use change which occurred at coastal of Muara Gembong has been affected land carrying capacity for the population. Aims of this study are identifying the current pattern of land use change in Muara Gembong, analyzing the ecological footprint of space utilization for coastal communities based on land use patterns developed in Muara Gembong and, calculate the optimal land used carrying capacity in the coastal of Muara Gembong. Analysis of image interpretation was used to identify land use pattern, while the carrying capacity was assessed through ecological footprint analysis approach. The results were shown that land use in Muara Gembong was dominated by fish pond (7,344 ha) while the least land use category was mangrove (379 ha) and farm (372 ha). Coastal waters was the highest ecological footprint (EF) value (2.95 ha cap-1) while the lowest EF was mangrove (0.001009 ha cap-1). This makes the carrying capacity of mangrove to be the highest otherwise the lowest carrying capacity was the carrying capacity of coastal waters
STATUS KEBERLANJUTAN PERIKANAN BAGAN PERAHU BERBASIS BIO-EKONOMI DI DESA TONIKU KABUPATEN HALMAHERA BARAT
Get PDFABSTRAKNelayan di Desa Toniku Kabupaten Halmahera Barat, awalnya menggunakan bagan perahu untuk menangkap ikan teri Stolephorus sp. sebagai umpan perikanan pole and line, akan tetapi pada saat ini banyak tertangkap selain teri yaitu juvenil dan larva ikan, ini permasalahan yang perlu dikaji komposisi tangkapan dari bagan perahu. Tujuan penelitian adalah menganalisis komposisi tangkapan, by-cacth, discard, dan aspek ekonomi. Penelitian dilaksanakan di perairan desa Toniku Kabupaten Halmahera Barat, dari tanggal 1 sampai 9 Juni 2018. Metode penelitian adalah metode survei. Obyek penelitian yaitu ikan hasil tangkapan bagan perahu. Hasil penelitian menunjukkan bahwa tangkapan bagan perahu didominasi oleh ikan target tangkap, yaitu; ikan teri (Stolephorus sp) sebesar 86,295%, tangkapan sampingan 12,335% dan tangkapan yang dibuang 1,370%. Tangkapan sampingan didominasi ikan peperek (Leiognatus sp) yaitu 5,575%. Nilai keuntungan Usaha bagan perahu sebesar Rp 93.047.200,00/tahun dengan B/C ratio 2,96. Berdasarkan perbandingan antara target tangkap dengan by-catch dan discard, bagan perahu di Desa Toniku Kabupaten Halmahera Barat dikategorikan alat tangkap ramah lingkungan dan secara finansial menguntungkan dan layak dikembangkan (berkelanjutan). Walaupun discard rate pada bagan perahu rendah namun usaha-usaha untuk meminimumkan tetap perlu dilakukan. Salah satu usaha yang bisa dilakukan adalah sortir, dan hasil tangkapan yang tidak memiliki nilai ekonomis dibuang ke laut dalam keadaan masih hidup. ABSTRACTFishermen in Toniku Village, West Halmahera Regency, initially used a boat lift net to catch anchovy Stolephorus sp. As bait for pole and line fisheries, but at this time many were caught besides anchovy, namely juvenile and fish larvae, these are problems that need to be studied from the boat lift net. The study objective was to analyze the composition of catchs, by-catch, discard, and economic aspects. The research was carried out in the waters of Toniku village, West Halmahera Regency, from June 1 to 9, 2018. The study method is the survey method. The object of the research is the fish catch by the boat lift net. The study results show the catch of the boat\u27s lift net was dominated by main catch, namely; anchovy (Stolephorus sp) is 86.295%, by-catch 12.335% and discard 1.370%. The bay-catch is dominated by peperek (Leiognatus sp) which is 5.575%. Value of the boat lift net business profit of Rp. 93,047,200.00/year with B/C ratio 2.96. Based on the comparison between catch targets and by-catch and discard, the boat lift net in Toniku Village, West Halmahera Regency is categorized as environmentally friendly and financially profitable and feasible (sustainable) fishing gear. Although the discard rate on the boat chart is low, efforts to minimize it still need to be done. One effort that can be done is sorting, and catches that have no economic value are dumped into the sea while still alive
OFFSHORE FLOATING MARINE FISH CAGE AQUACULTURE DEVELOPMENT PLANNING EVALUATION BASED ON HYDRO-OCEANOGRAPHY CONDITIONS IN SABANG BAY, WEH ISLAND
Get PDFSabang coastal bay becomes the area of significance where the development centered in the semi-enclosed area. Sabang Bay is well-known as the center of marine economy (Aquaculture, Harbor, and marine tourism). Recently, there is a planning initiated by Ministry of Marine Affairs and Fisheries (MMAF) to install the floating fish cage aquaculture (KJA) in the offshore area of Sabang Bay which the planning becomes a controversy between local people, local government, and researchers as well. This study aims to evaluate and discuss the impacts that will be happened if KJA is applied. Field surveys on hydro-oceanography aspects were done measuring currents, tides, waves, winds, bathymetry, water quality, as well as tourism condition. Based on those hydro-oceanography conditions, Sabang Bay categorized into calm water area where the sea current is weak (ranging from 0-0.12 m/s), whilst the high values of pH, salinity, and temperature are identified within the bay during low tidal condition. If KJA is installed within the bay, automatically it will pollute the water due to the accumulation of remaining fish feeder wastes. Moreover, within the bay, there are several attractive marine tourisms such as diving sites, the conservation area of Sophie Rickmers shipwreck site, and hot bubble (fumaroles hydrothermal vent). The presence of KJA will possibly disrupt marine tourism activities so that the implementation of KJA needs to be considered the impacts before installation