Jurnal Ilmu dan Teknologi Kelautan Tropis
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PERBANDINGAN KELIMPAHAN MAKROZOOBENTOS DI EKOSISTEM LAMUN PADA SAAT BULAN PURNAMA DAN PERBANI DI PULAU PANGGANG KEPULAUAN SERIBU JAKARTA
Get PDFMakrozoobentos merupakan salah satu organisme yang keberadaannya banyak terdapat di ekosistem lamun. Tujuan penelitian untuk menganalisis perbedaan kelimpahan individu dan spesies makrozoobentos di bulan purnama dan perbani, melihat korelasi kepadatan makrozoobentos dengan penutupan lamun, dan mengetahui kontribusi spesies makrozoobentos pada habitat lamun. Penelitian ini dilakukan di pulau panggang dengan 3 stasiun pengamatan makrozoobentos di ekosistem lamun pada bulan Maret dan April 2016. Pengambilan data makrozoobentos di lamun secara sistematis menggunakan metode transek kuadran 1x1 m dan corer berdiameter 10 cm untuk infauna. Menganalisis nilai kerapatan, tutupan lamun dan kelimpahan makrozoobentos. Analisis data statistik kelimpahan makrozoobentos menggunakan uji ANOVA, korelasi kepadatan makrozoobentos dengan tutupan lamun menggunakan regresi linear sederhana dan kontribusi spesies pada bulan purnama dan perbani menggunakan analisis SIMPER. Hasil penelitian didapatkan tidak adanya perbedaan nyata kelimpahan individu makrozoobentos di bulan purnama dan perbani. Sedangkan spesies didapatkan perbedaan nyata yang signifikan. Korelasi positif antara kepadatan makrozoobentos dengan tutupan lamun dibulan purnama, sedangkan pada bulan perbani berkorelasi negative. Analisis SIMPER menunjukan kontribusi spesies makrozoobentos tertinggi di tiap-tiap stasiun di bulan purnama dan perbani adalah spesies Cerithium salebrosum. Kesimpulan kepadatan spesies makrozoobentos menunjukkan perbedaan nyata di bulan purnama dan perbani, namun tidak pada kelimpahan individu
SUITABILITY OF LOCATION FOR RESTOCKING CLAMS TRIDACNIDAE IN THE SPERMONDE ARCHIPELAGO
Get PDFEfforts to protect giant clams from extinction one of them through conservation, which set a region as a restocking area. The research aimed to analyze the suitability environments with the density giant clams in the aquatic. The research conducted in September 2013-January 2014. The research site was determined by purposive sampling of middle inner zone = MIZ, middle outer zone = MOZ, and outer zone = OZ in the aquatic of Spermonde Archipelago. The research conducted was using observation method of biology, physics, and chemistry parameters of aquatic at mintakat reef flats, reef slope and reef base. Data analysis of location suitability of restocking giant clams using WSM method (and correlation analysis of giant clams density with water quality, then integrated with ALOS Avnir-2 image. The result research shows the density giant clams influenced by the physical environment parameters, mainly salinity, brightness and depth. The suitability location of restocking giant clams for class Very suitable in P. Langkadea and P. Pala (MOZ), P. Cangke (OZ), P. Tambakulu and P. Kondongbali (OZ) on mintakat reef flats. Class Very suitability on reef slope in P. Kondongbali and P. Kapoposang (OZ). Class accordance with the reef flats, there are P. Podang Podang Lompo (MOZ), P. Sarappo Keke (OZ) and P. Kapoposang (OZ). Class Appropriate to reef slope mintakat in P. Langkadea (MOZ) and P. Sarappo Keke (OZ). Determination of giant clams restocking area in nature needs considers the location suitability, primarily the quality of aquatic physics. Keywords: conservation, clam, weight sum model, ALOS Avnir-2 imag
TRAJECTORY MODEL FOR IDENTIFICATION OF OIL SPILL AROUND THE COAST OF PARI ISLAND, SERIBU ISLANDS, NORTH JAKARTA
Get PDFOil spills at sea are common in the shipping lanes of the ship as well as the locations of offshore oil drilling. Unfortunately, in every occurrence of the oil spill, we only see the effects after the occurrence, without knowing the original source. Indonesian Numerical Coastal Environmental Assessment (IndoNACE) is research collaboration between Indonesian and Germany by applying satellite data, numerical modeling, and field observations to make an assessment on environmental consequences to oil spills at sea. One of the locations of these research activities is Pari Island, Seribu Islands, North Jakarta. Simulation of hydrodynamic models around Pulau Pari with Hamburg Shelf Ocean Model (HAMSOM) was performed using tides, surface winds, and density difference of seawater as input. Afterwards, by utilizing results of the hydrodynamic model, the spreading of oil spills as well as the origin of the oil spills were estimated using forward and backward trajectory models, respectively. In the case study of Pari Island, there is a presence of thin film of oil in 5 November 2015 that disappears after one day. We suggest that the origin of oil spills were found on the beach Pari Island is expected from the east - northeast of Thousand Islands and is likely from the subsea pipeline which runs from the north to the city of Jakarta or shipping lanes through the Indonesian archipelagic sea lanes (ALKI) I of Karimata Strait up to Java Sea and the Jakarta Bay
SUSPENDED SOLID LOAD OF KAWAL AND GALANG BATANG RIVERS, AND ITS DISTRIBUTION AT GUNUNG KIJANG COASTAL AREA, EAST DISTRICT OF BINTAN
Get PDFThe research aimed to discover the runoff suspended solid load of Gunung Kijang estuary to coastal area, East District of Bintan. The research was held in May and September 2015. The total suspended solid (TSS) load in five estuaries was measured on May. On September, measurement was focused in two biggest estuaries, Kawal and Galang Batang. The TSS in coastal water area was measured both on May and September. Regarding to five estuaries measured, the lowest TSS came from Angus River while the highest comes from Kawal River. TSS load in May on both estuary were lower than in September. Suspended solid load at the lowest tide period was higher than at the highest tide at both estuaries. In May TSS load in the Kawal estuary was 528.723 mg/sc and Galang Batang estuary was 172.903 mg/sc. In September TSS load in the Kawal estuary was 720.920 mg/sc while Galang Batang estuary was 446.893 mg/sc. These results indicate that tidal patterns and current were major influence on the TSS load in estuaries. Keywords : Bintan, coastal water, estuary, load, TS
STRUKTUR POPULASI IKAN KURAU Polynemus dubius DI TELUK PALABUHANRATU
Get PDFTeluk Palabuhanratu memiliki banyak sumberdaya ikan, salah satunya adalah ikan kurau Polynemus dubius. Aktivitas penangkapan ikan yang terus-menerus dapat mempengaruhi dinamika populasi ikan kurau. Perubahan dinamika populasi dapat diketahui dengan melihat struktur ukuran dan reproduksi ikan. Tujuan penelitian ini adalah untuk menganalisis status populasi ikan kurau P. dubius di Teluk Palabuhanratu melalui pengkajian aspek reproduksi dan dinamika populasi selama bulan Mei-September 2017. Jumlah ikan kurau diperoleh sebanyak 384 ekor ikan jantan dan 556 ekor ikan betina dengan menggunakan metode Penarikan Contoh Acak Berlapis (PCAB). Analisis data terdiri atas sebaran frekuensi panjang, hubungan panjang bobot, serta rasio kelamin dan tingkat kematangan gonad. Hasil penelitiaan diperoleh bahwa rasio kelamin jantan dan betina adalah 1:1,45 (tidak seimbang), tingkat kematangan gonad IV terjadi pada bulan september sebesar 68% jantan dan 38% betina. Hubungan panjang bobot ikan kurau memiliki pola pertumbuhan isometrik didominasi oleh ikan belum matang gonad. Oleh karena itu, status populasi ikan kurau di Palabuhanratu sudah menunjukan overexploited dengan aspek reproduksi yang menunjukkan kondisi TKG yang tidak ideal, nilai Lc<Lm dan menangkap pada musim pemijahan akan mengganggu keberlanjutan populasi ikan ini sedangkan dari sisi dinamika populasi, pertumbuhan ikan yang seragam menunjukkan potensi pertumbuhan ikan semakin rendah dan perlu kehati-hatian dalam menetapkan target tangkapan
SELECTION OF KURAU FISHING TECHNOLOGY UNITS Eleutheronema tetradactylum WHICH COMPETITIVE AND SUSTAINABLE
Get PDFEnvironmentally friendly fishing technology unit is needed in sustainable fisheries management. The purpose of this study was to determine the fishing technology unit of kurau competitive and sustainable. Data collection was carried out from July to September 2016 in the Coastal Pambang of Bengkalis District of Riau Province, by using the survey method. The analytical data method used is scoring the biological, technical and socioeconomic aspects the fishing technology unit of kurau. Results of research show that combined analysis of biological, technical and socioeconomic aspects have the value of the VA fishing line function (2.48) is higher than the other three fishing gear. Thus, the fishing line is a selected fishing technology unit of kurau competitive and sustainable in the Coastal Pambang Bengkalis District. Keywords: competitive,coastal pambang, fishing technology, kurau fish,sustainable fishin
GENETIC DIVERSITY OF OLIVE RIDLEY Lepidochelys olivacea ASSOCIATED WITH CURRENT PATTERN IN CENDRAWASIH BAY, PAPUA
Get PDFCendrawasih Bay is habitat for olive ridley (Lepidochelys olivacea) which is directly adjacent to the Pacific Ocean. The presence and the diversity of L. olivacea in Cendrawasih Bay has been threatened. Genetics can be the key to conservation because they play an important role in maintaining population and recovering from damage. This study aims to determine the genetic diversity of L. olivacea and its association to the current pattern in the waters of Cendrawasih Bay. Samples of L. olivacea (n=20) were collected in Kwatisore (n=8) and Yapen Island (n=12) in Cendrawasih Bay waters from August 2015 to December 2016. The molecular analysis was based on 791-bp fragment of D-Loop on the non-coding region gen. The current pattern analysis was performed through INDESO data and visualized by using Ferret software. Phylogenetic analysis showed that 2 groups of L. olivacea from a total of 2 haplotypes, whose population from Kwatisore was dispersed in two haplotypes, while the population from Yapen Island was only dispersed in one haplotype. Populations from Kwatisore showed higher variations than populations from Yapen Island. The current pattern analysis suggests that the two study sites, Kwatisore and Yapen islands are different. Both populations are only connected by the Northwest monsoon currents period that indicates a little geneflow between this populations. Thus causing differences variation between Kwatisore and Yapen Island populations genetically. Keywords: genetic diversity, current pattern, coral triangle, olive ridle
LOBSTER FISHERY MANAGEMENT IN THE MARINE ECOSYSTEM APPROACH AT SIMEULUE ISLAND WATERS (WPP-NRI 572)
Get PDFThe lobster fishery is one of the leading fisheries commodity on Simeulue Regency so that local government must manage wisely in order to maintain the sustainability of the lobster fishery. Aceh Government Regulation namely Qanun Aceh No. 7 of 2010 concerning fisheries already in effect. However, the institutional system has not functioned optimally in the management of lobster fisheries. The purpose this study is to examine the domain of fishing techniques, socio-economic and institutional management of lobster fisheries with ecosystem approaches in Simeulue waters. Research method using qualitative research. The method of data collection is survey method which is done by purposive sampling approach that is by doing depth responder interview which is considered informative and wide knowledge about the institute. Data analysis using EAFM analysis done with Flag Modeling technique. Based on the results of the study that the assessment of the fishing domain techniques and economic domains in aggregate showed bad category. Meanwhile, social domains and institutional domains show moderate categories so aggregate composites overall show fewer categories. It is therefore necessary to make a tactical decision from the bad to be better in accordance with the category of each EAFM domain. Keywords: fisheries management with ecosystem approach (EAFM), WPP 572, Simeulu
PERTUMBUHAN LARVA DAN PRODUKSI BENIH IKAN KERAPU BEBEK Cromileptes altivelis Valenciennes, 1828 HASIL BUDIDAYA TURUNAN KE-3
Get PDFABSTRAKKetersediaan induk dalam suatu usaha pembenihan memiliki peran yang sangat penting. Namun demikian, ketersediaan induk yang berasal dari alam sangat terbatas jumlahnya, sehingga perlu dilakukan penyediaan calon induk yang berasal dari hasil budidaya. Ikan kerapu bebek Cromileptes altivelis Valenciennes, 1828 turunan pertama (F-1) dan turunan kedua (F-2) sudah dapat diproduksi dari hasil budidaya, namun benih turunan ketiga (F-3) belum dapat diperoleh. Penelitian ini bertujuan untuk mendapatkan karakteristik morfologis dan pertumbuhan larva ikan kerapu bebek F-3 sebagai calon induk F-3, serta tingkat keberhasilan produksi benihnya. Pemeliharaan larva dilakukan dalam hatchery hingga larva menjadi benih. Parameter yang diamati meliputi panjang total dan panjang duri sirip larva, berat tubuh larva serta sintasan dan jumlah produksi benih. Hasil penelitian menunjukkan bahwa panjang total larva umur 5, 15, 25 dan 35 hari, masing-masing adalah 3,20±0,07; 4,42±1,11; 8,35±1,12 dan 12,51±3,23 mm. Duri sirip mulai terukur pada larva umur 15 hari. Berat larva umur 30 hari adalah 0,11±0,04 g. Pola pertumbuhan panjang total dan berat tubuh larva adalah eksponensial, sedangkan pola pertumbuhan duri siripnya adalah linier. Masa pemeliharaan larva hingga menjadi benih adalah ± 40 hari. Jumlah benih ikan kerapu bebek F-3 yang diproduksi dalam satu kali siklus pemeliharaan berkisar 440 hingga 2.300 ekor dari 50 ekor induk dan 3 kali siklus pemijahan dengan tingkat kelangsungan hidup 1,30% hingga 8,80%. Hasil penelitian ini mengindikasikan bahwa ikan kerapu bebek F-3 dapat diproduksi dari hasil budidaya seperti halnya pada F-1 dan F-2. ABSTRACTBroodstocks are the most important part of humpback grouper culture, but their availability in nature are limited. Therefore, it is necessary to produce broodstock candidates from culture. The first (F-1) and the second (F-2) generation of humpback grouper have already been produced but the third generation (F-3) production is still on the way. This study was conducted to find out morphological characteristic of the third generation (F-3) of humpback grouper larvae as the candidate of the third generation of broodstock, larval growth and the success rate of seed production. Larvae rearing was done in hatchery until larvae metamorphosed to be seeds. Observed variables including larval total length and spine length, larval body weight, survival rate and the juvenile productions. The study result showed the total length of 5, 15, 25 and 35 days old larvae were 3.20±0.07; 4.42±1.11; 8.35±1.12 and 12.51±3.23 mm, respectively. The spine began measured on 15 days old larvae. The body weight of 30 days old larvae was 0.11±0.04 g. The growth pattern of larval total length and body weight were exponential, while the growth of spine was linear. Rearing period from larvae to juveniles was 40 days. Number of F-3 seed production of humpback grouper produced from once rearing cycle range between 440 and 2,300 fish and the survival rate range from 1.30% up to 8.80%. Therefore, this study could indicate that seed of F-3 humpback grouper can be produced as those of F-1 and F-2
KANDUNGAN MAGNETIT DAN DISTRIBUSI SEDIMEN PADA PANTAI ANOI ITAM, PULAU WEH
Get PDFKeberadaan pasir besi dalam suatu wilayah memiliki peran ekonomis penting, umumnya dimanfaatkan sebagai bahan baku untuk industri. Di sisi lain, kandungan mineral dan magnetit dalam sedimen dapat digunakan sebagai bahan penjejak untuk menelusuri proses transport sedimen dalam suatu lingkungan perairan. Penelitian ini bertujuan memberikan gambaran pola distribusi magnetit di lingkungan Pantai Anoi Itam (PAI) yang berada di bagian timur Pulau weh, Kota Sabang. Analisis komposisi magnetit bersama dengan parameter ukuran butiran rata-rata, digunakan untuk mendeskripsikan pola sebaran pasir besi yang terbentuk pada kawasan PAI. Sampel sedimen diambil pada bulan Februari 2017 menggunakan coring pada 20 stasiun di sepanjang pantai (alongshore). Parameter ukuran butiran rata-rata diperoleh menggunakan metode ayak basah, sedangkan kandungan magnetit dihasilkan dari separasi menggunakan magnet kuat Neodynium tipe n-35. Sedimen PAI dicirikan memiliki tekstur yang agak kasar, dimana tipe pasiran dengan sedikit kerikil (Slightly Gravelly Sand) umum ditemukan. Diperoleh nilai ukuran butiran rata-rata sedimen antara 0,30 mm hingga 1,72 mm, dengan rerata (average) 0,74 mm. Magnetit memiliki nilai ukuran butiran rata-rata antara 0,31 mm hingga 1,82 mm, dan diperoleh rerata sebesar 0,76 mm. Keterdapatan magnetit ditemukan dalam persentase yang tinggi pada bagian utara PAI dan menjadi lebih rendah menuju bagian selatan, sehingga disimpulkan bahwa pola sebaran magnetit berasal dari bagian utara PAI