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Journal of Marine Research

jmr
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Published by Universitas Diponegoro

ISSN : - EISSN : 24077690 DOI : 10.14710/jmr.v9i4.28340

Core Subject : Science,

Earth & Planetary Sciences

The Journal of Tropical Fisheries Management is managed by the Department of Water Resource Management, Faculty of Fisheries and Marine Sciences, Bogor Agricultural University aims to publish the results of basic, applied research in the scope of fisheries resources, fish stock studies, and population dynamics, fish biodiversity, fisheries technology, industrialization and fish trade, fisheries management, and fisheries development policies in the tropics, especially Indonesia. The scope of the area includes: Marine Fisheries Coastal Fisheries Inland Fisheries The focus and scope of this publication are expected to contribute thoughts for the government to strengthen the science of fisheries management

Arjuna Subject : -

Articles 687 Documents

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ANALISA SPASIAL PADANG LAMUN DENGAN MENGGUNAKAN DATA PENGINDERAAN JAUH SATELIT GEOEYE-1 DI PERAIRAN PULAU PARANG DAN PULAU KUMBANG, KEPULAUAN KARIMUNJAWA Kurniawan, Andhika; Subardjo, Petrus; Pratikto, Ibnu
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Penelitian ini dilaksanakan di Perairan Pulau parang dan Pulau Kumbang, Kepulauan Karimunjawa. Sampai saat ini masih jarang penelitian yang membahas secara intensif ketersediaan informasi data kondisi padang lamun didaerah ini. Tujuan dari penelitian ini adalah untuk melakukan analisa spasial dan pemetaan padang lamun dengan menggunakan citra Satelit GeoEye-1, serta melakukan kajian kondisi padang lamun. Metode yang digunakan dalam penelitian ini adalah metode deskriptif, sedangkan untuk cek lapangan menggunakan sampling purposif. Hasil dari penelitian menunjukkan bahwa luas keseluruhan padang lamun diperairan pulau parang dan pulau kumbang mencapai 151,56 ha, yang terbagi menjadi tiga kelas yaitu kelas tutupan tinggi 13,21 ha, kelas tutupan sedangÂ 75,11 ha, dan kelas tutupan rendah 63,23 ha. berdasarkan pengamatan dilapangan ditemukan 5 jenis spesies lamun yaitu Cymodocea rotundata, Cymodocea serrulata, Enhalus acoroides, Halophila ovalis, dan Halophila spinulosa. Hasil penghitungan persen penutupan padang lamun menunjukkan bahwa penutupan tertinggi terdapat pada stasiun 5 dengan penutupan rata-rata total dari setiap spesies lamun yaitu 4,74 %, sedangkan penutupan terendah terdapat pada stasiun 11 yang berjumlah 0,05%. Nilai indeks keanekaragamanragaman (Hâ€™) lamun adalah 1,25, indeks keseragaman (E) 1,14, dan indeks dominasi (C) 0,40.

Kajian Kelas Panjang Berat Ikan Pelagis Kecil Ikan Kembung Lelaki (Rastrelliger canagurta) Yang Didaratkan Di Tambak Lorok, Semarang, Jawa Tengah Wandira, Ardiati Widya; Suryono, Chrisna Adhi; Suryono, Suryono
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

ABSTRAK : Ikan kembung lelaki (Rastrelliger canagurta) merupakan salah satu potensi sumberdaya ikan ekonomis. Penelitian dilakukan di Tempat Pendaratan Ikan (TPI) Tambak Lorok Semarang Jawa Tengah selama periode bulan November 2015 hingga Januari 2016. Tujuan penelitan adalah untuk mengetahui kelas panjang berat ikan kembung lelaki (Rastrelliger canagurta) berdasarkan beberapa faktor biologi yang meliputi panjang berat, faktor pertumbuhan, faktor kondisi, mortalitas dan laju eksploitasi. Sampling ikan yang diperoleh selama penelitian berjumlah total 1015 ekor dengan kisaran panjang total yang dominan pada bulan November dan Desember 2015 yaitu 143 mm -159 mm, sedangkan pada bulan Januari 2016 adalah kisaran 160 mm -175 mm, terbagi dalam 11 kelas dengan interval 16. Nilai b merupakan hubungan panjang berat ikan kembung lelaki yang didaratkan di TPI Tambak Lorok Semarang pada seluruh waktu sampling adalah sebesar < 3 yang berarti bahwa pertumbuhan ikan kembung lelaki (R. canagurta) yang tertangkap adalahÂ allometrik negatif dimana keadaanÂ pertambahan panjang ikan lebih cepat dibandingkan pertambahan beratnya. Hal ini diduga dikarenakan oleh faktor lingkungan dan ketersediaan pangan. Koefisien pertumbuhan (K) adalah sebesar 1,6,Â panjang asimtotik (LÂ¥) adalah sebesar 267,75 mm dan umur teoritis mula-mula (t0) sebesar -0,024. Nilai faktor kondisi rata-rata tertinggi yaitu 1,18 sedangkan yang terendah adalah 0,88. Hal ini menunjukkan bahwa ikan dalam keadaan kurang gemuk. Laju mortalitas terbesar disebabkan oleh mortalitas alami dengan nilai yaitu sebesar 0,982 dan didapatkan laju eksploitasi sebesar 0,478. Nilai laju eksploitasi ini termasuk dalam nilai eksploitasi optimum 0,5.Â ABSTRACT : Indian mackerel (Rastrelliger canagurta) has high economic value. This research was conducted at Tempat Pendaratan Ikan (TPI) Tambak Lorok Semarang Central Java during the period November 2015 to January 2016. This reasearch was conducted to study length-weight of small pelagic fish Indian Mackerel (Rastrelliger canagurta) based on several factors that include length-weight, growth parameter, condition factors, mortality and level of exploitation.The sampling fish obtained during research is 1015 fish with a total length range that is dominant in November and December 2015 between 143 mm-159 mm, in January 2016 between 160 mm-175 mm and was divided into 11 classes with 16 intervals. The values of b is lenght-weight relationship Indian mackerel fish landed in Tempat Pendaratan Ikan (TPI) Tambak Lorok Semarang at all sampling time wasÂ < 3, which means that the grow of Indian mackerel fish (R. canagurta) caught is negative allometric in which state the length of fish faster than gain weight. It can be influenced by environmental factors and food availability. The largest value of growth coefficient (K) was 1,6, asymptotic length (LÂ¥) was 267,75 mm and the theoretical age at first (t0) was -0,024. The value of condition factor was 1,18 and the lowest was 0.88. This indicates that fish in less fat condition. The highest mortality rate is caused by natural mortality amounted 0,982 and obtainedÂ the rate of exploitationÂ value was 0,478. The exploitation value is still included in optimum exploitation which is 0,5.

PENGARUH PENGGUNAAN DIVINE CIGARETTE TERHADAP LAJU PERTUMBUHAN IKAN BANDENG (Chanos chanos ForskÃ¥ll, 1775) Aisa, Aulia; Sunaryo, Sunaryo; Azizah, Ria
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Market demand for milkfish (C. chanos ForskÃ¥ll, 1775) is continually to increase, since it is used for consumption and live bait for tuna and skipjack. The purpose of this research was to determine the effect of the Divine cigarette fumigation in fish feed on the growth of milkfish (C. chanos ForskÃ¥ll, 1775). This research used experimental laboratories method with 4 treatments and 3 replications. The first treatment (A) was fumigation the Divine cigarette on fish feed for 5 minutes, the second treatment (B) for 10 minutes, the third treatment (C) for 15 minutes, and the fourth treatment (K) for without fumigation (control). Results of this research showed the highest specific growth rate was obtioned in treatment C which was equal to 2.51% daily. The lowest of mercury content was on the treatment A and C, resulting in decreased levels of mercury in milkfish (C. chanos ForskÃ¥ll, 1775). Based on the result it can be concluced that the fumigation treatment of Divine cigarette for 15 minutes in fish feed can increased the specific growth rate of the milkfish (C. chanos ForskÃ¥ll, 1775).

Biometrika Kerang Darah (Anadara granosa) Pada Tambak Budidaya Di Desa Menco Kecamatan Wedung Kabupaten Demak R., Rizky Imtihan; Hartati, Retno; Suprijanto, Jusup
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Kerang Darah (Anadara granosa) termasuk ke dalam kelas Bivalvia yang kebanyakan hidup di laut terutama di daerah litoral, dasar perairan yang berlumpur atau berpasir, tetapi dapat juga dibudidayakan di Tambak. Tujuan penelitian ini adalah untuk mengetahui Biometrika Kerang Darah (Anadara granosa ) pada 3 Tambak yang berbeda. 1200Â sampel Kerang DarahÂ diambil dari 3 Tambakdi Desa Menco, Kecamatan Wedung, Demak selama bulan Januari sampai Maret 2014 dengan interval 2 minggu sekali untuk diamati pertumbuhan dan indeks kondisinya. Hasil penelitian ini berupa bentuk model pertumbuhan absolut atau mutlak panjang Kerang Darah (Anadara granosa) pada stasiun 1, 2, dan 3 yaitu = Lt = 12,9944 ( 1 - e â€“0.0713(t-0,492017)) , Lt = 11,21197 ( 1 - e â€“0,0618(t-0,756669)), dan Lt = 10,68319 ( 1 - e â€“0,0565(t-0,620325)). Model pertumbuhan absolut atau mutlak berat kerang darah pada Stasiun 1, 2 dan 3 yaitu = Wt = 13,4798 ( 1 - e â€“0,0716(t-0,485747)), Wt = 13,1795 ( 1 - e â€“0,0713(t-0,490326)), dan Wt = 13,1795 ( 1 - e â€“0,0713(t-0,490326)). Nilai indeks kondisi dominan kategori sedang (2,5 â€“ 4,5) berjumlah 254 ekor (Stasiun 1), 206 ekor (Stasiun 2), dan 276 ekor (Stasiun 3) kemudian kategori gemuk (>4,5) berjumlah 133 ekor (Stasiun 1), 175 ekor (Stasiun 2), dan 87 ekor (Stasiun 3)

STUDI KANDUNGAN BAHAN ORGANIK SEDIMEN TERHADAP KELIMPAHAN BIVALVIA DI PERAIRAN SEMARANG BAGIAN TIMUR Nurfakih, Asnandi; Suryono, Chrisna Adi; Sunaryo, Sunaryo
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

The condition of waters east of Semarang allegedly tainted by the many human activities such as settlements, ports, industries, fishing and bivalves are large, it will create different ecological conditions for the biota that are inside. Study of the bivalves is considered important because of its high tolerance and live it life in order to describe the environmental changes that occur in this waters. This research was conducted on October 7, 12 November and 11 December in the waters of eastern Semarang. The material on this research was substrate or sediment, and bivalves were taken using a modification dredge. The result showed that 8 species were found, there were, Anadara granosa, Anadara gubernaculum, Anadara innaequivalvis, Anadara pilula, Marcia hiantia, Placuna placenta, Paphia undulate, and Pharella javanic. The species with the highest abundance was Anadara granosa ( 301.1 Ind / ha (Station III)). Organic matter content was highest at station II, period 2, amounting to 22.56%, and lowest was at station V, period 3, amounting to 9.48%. The correlation between organic matter content of sediment with an abundance of bivalves in the waters of eastern Semarang overall was not significant.

Biologi Portunus pelagicus, Linnaeus, 1758 (Malacostraca : Portunidae) dari Perairan Jepara Ditinjau dari Distribusi Ukuran, Tingkat Kematangan Gonad, dan Pertumbuhan Hidayah, Ulfah Nur; Partikto, Ibnu; Irwani, Irwani
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Rajungan (Portunus pelagicus) merupakan salah satu komoditi perikanan yang memiliki nilai ekonomis tinggi yaitu Rp. 70.000 â€“ 90.000 /kg dan banyak diminati oleh masyarakat baik di dalam maupun luar negeri. Penurunan potensi sumberdaya rajungan (Portunus pelagicus) di beberapa perairan Indonesia mulai memprihatinkan. Hal tersebut dapat dihindari dengan memahami faktor-faktor internal dan eksternal yang berpengaruh pada sumberdaya rajungan. Penelitian ini bertujuan untuk mengetahui distribusi ukuran, nisbah kelamin dan tingkat kematangan gonad, hubungan panjang berat dan faktor kondisi, serta tingkat pertumbuhan rajungan berdasarkan fase bulan baru dan bulan purnama di Perairan Teluk Awur Jepara. Hasil penelitian distribusi ukuran lebar rajungan rata-rata 12,65 Â± 1,335 pada bulan purnama dan 12,64 Â± 1,259 cm pada bulan baru. Distribusi berat rata-rata 147,28 Â±53,85 gram pada bulan purnama dan 146,65 Â± 53,31 gram pada bulan baru. Distribusi tingkat kematangan gonad rajungan betina yaitu TKG 1 sebanyak 126 ekor, TKG 2 sebanyak 77 ekor, dan TKG 3 sebanyak 112 ekor sedangkan rajungan betina yang belum matang gonad 225 ekor. Nisbah kelamin rajungan jantan dan betina di Teluk Awur yaitu 0,9 : 1. Pola pertumbuhan rajungan di Teluk Awur yaitu bersifat allometrik negatif dimana pertumbuhan panjang karapas lebih dominan daripada pertumbuhan bobot tubuhnya. Sedangkan tingkat pertumbuhan rajungan untuk mencapai panjang maksimal yaitu 8,16 cm dengan koefisien pertumbuhan 0,6 per tahun.Â Blue Swimming Crab (Portunus pelagicus) is one of the fisheries commodity which has high economic value Rp. 70.000 â€“ 90.000 /kg and is much in demand by the both domestic and foreign societies. The decrease of blue swimming crab (Portunus pelagicus) resource potential in some Indonesian waters is starting to apprehensive, that can be avoided by understanding the internal and external factors that influence the blue swimming crab resources. This research aimed to determine the size distribution, sex ratio and gonad maturity level, the relationship of length of weight and condition factor, and blue swimming crab growth rates according to the phase of the new moon and full moon in the Jepara Teluk Awur Waters. The results of the research of the width distribution of most crab in the full moon 12,65 Â± 1,335 Â cm and 12,64 Â± 1,259 in the new moon. The distribution of weight are 147,28 Â±53,85 grams in the full moon and 146,65 Â± 53,31 in the new moon phases. The distribution of maturity levels of female blue swimming crab gonads that is TKG 1 amounted 126 crabs, TKG 2 amounted 77 crabs, and TKG 3 amounted 112 crabs. While the female immature blue swimming crab were gonads 225. The sex ratio of male and female blue swimming crab in Teluk Awur is 0,9 : 1. The blue swimming crab growth pattern in Teluk Awur is negative allometric where the growth of carapace length is more dominant than the growth of its body weight. While the blue swimming crab growth rate to reach the maximum length is 8.16 cm with a growth coefficient of 0.6 per year.Â

Studi Kandungan Logam Berat Pb, Cu, Cd, Cr Pada Kerang Simping (Amusium pleuronectes), Air Dan Sedimen Di Perairan Wedung, Demak Serta Analisis Maximum Tolerable Intake Pada Manusia Azhar, Husnan; Widowati, Ita; Suprijanto, Jusup
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Wedung, Demak which have large potential of asian moon scallop (Amusium pleuronectes). This potential has leaded the increasing activities of fishing, industrial, and dense residential in Wedung. Those activities were thought to be one of the sources of heavy metals (Pb, Cu, Cd, Cr) accumulated in the simping. This study was aimed to determine the concentration of Pb, Cu, Cd, Cr in the A. pleuronectes, in the water and the sediment. Moreover, this study was also aimed to investigate the maximum weekly consumption A. pleuronectes which contained Pb, Cu, Cd, and Cr in Wedung waters area, Demak. The study was conducted in October-November 2011. The method used in this study was a study case method, while the purposive sampling method was used to determine the sampling locations. Sampling was conducted once every two week, with three repetitions. AAS (Atomic Absorbtion spectrophotometry), were used to analyze the heavy metal concentration, while the consumption of security analysis was used to analyze the MTI (Maximum Tolerable Intake). The range of the analysis results of Pb concentration in the scallopâ€™s shells were 33,1362 â€“ 35,0762 ppm, and 11,1272 â€“ 13,0852 ppm in the sediments, while the concentration in the soft tissues and water, were not detected. The Cu concentration in the soft tissue were ranged from 8,9849 â€“ 9,4659 ppm, where in the scallopâ€™s shells were 11,9836 â€“ 12,2358 ppm, water were 0,07 â€“ 0,14 ppm, and in the sediments were 13,0624 â€“ 17,6040 ppm. The Cd concentration in soft tissue were ranged from 5,9212 â€“ 8,0136 ppm, scallopâ€™s shell were 2,6195 â€“ 5,0125 ppm, and water were 0,01 ppm at 2nd and 3rd samplings, while at the first sampling was not detected, whereas in the sediments the concentration ranged from 0,4694 â€“ 0,7257 ppm. Cr concentration in the soft tissue were only detected in the third sampling with 0,7285 ppm, while in the scallopâ€™s shells ranged from 1,9694 â€“ 2,6924 ppm, and in the sediments were 0,9693 â€“ 1,6933 ppm, while its concentration in water was not detected. Maximum weekly intake of scallop in Wedung water which are safe for consumption were 22,64 kg for Cu; 0,06 kg for Cd; and 5,76 kg of Cr per week for people with average body weight 60 kg, while the Pb concentration not detected.

POTENSI YEAST DALAM FERMENTASI ALGINOFIT Sargassum polycystum C.A Agardh DENGAN HIDROLISIS ASAM SULFAT UNTUK PEMBUATAN BIOETANOL Febriani, Nur Indah; Ridlo, Ali; Susanto, A. Budi
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Kebutuhan energi merupakan masalah besar yang dihadapi oleh bangsa Indonesia, karena energi yang digunakan saat ini berasal dari bahan bakar fosil yang jumlahnya terbatas dan non-renewable. Salah satu solusi untuk mengatasi krisis energi adalah dengan menggunakan bioetanol. Pemanfaatan biomassa selulosa dari rumput laut S. polycystum diharapkan dapat mengatasi permasalahan kebutuhan energi.Â Penelitian ini bertujuan untuk menentukan konsentrasi optimum asam sulfat pada proses hidrolisis serbuk kasar rumput laut S. polycystum, serbuk halus rumput laut S. polycystum, Na alginat S. polycystum dan sodium alginat; mengetahui pengaruh yeast serta lama fermentasi terhadap bioetanol yang dihasilkan. Metode yang digunakan dalam penelitian ini adalah metode eksperimental dengan Rancangan Acak Lengkap (RAL) pola faktorial dan tiga ulangan untuk proses hidrolisis. Fermentasi dilakukan selama 3 hari (72 jam), pengukuran kadar etanol dilakukan setiap 24 jam dengan 3 kali ulangan. Hasil penelitian menunjukkan bahwa serbuk halus rumput laut S. polycystum dengan konsentrasi H2SO4 optimum 0,1 M mempunyai kadar gula reduksi tertinggi. Bioetanol optimum dicapai menggunakan yeast S. cerevisiae. Kadar bioetanol optimum dicapai pada lama fermentasi 72 jam yaitu (0,8167% v/v Â±0,1530).

Struktur Komunitas Larva Ikan Pada Muara Sungai Di Kawasan Mangrove Pesisir Kota Semarang Jawa Tengah Lestari, Gita; Riniatsih, Ita; Susilo, Endang Sri
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

ABSTRAK : Mangrove merupakan salah satu ekosistem pada muara sungai di pesisir kota Semarang yang memiliki peran sebagai tempat mencari makan, pemijahan, pembesaran dan bersarang organisme perairan termasuk larva ikan.Â Penelitian ini bertujuan untuk mengetahui struktur komunitas larva ikan yang meliputi keseragaman, keanekaragaman, dan dominansi larva ikan serta kelimpahan dan komposisinya pada muara sungai di pesisir kota Semarang yaitu Mangkang wetan, Trimulyo, Maron, dan Mangunharjo. Pengambilan sampel dilakukan menggunakan Neuston Net dengan ukuran mata jaring 500 Âµm dan ditarik kapal secara horizontal sepanjang 50 meter selama Â± 2 menit. Parameter lingkungan yang diukur antara lain suhu, salinitas, kecerahan, kedalaman dan pH. Hasil penelitiaan didapat Larva ikan sebanyak 101 individu dan yang berhasil teridentifikasi berjumlah 79 individu yang terdiri dari 3 Famili yaitu Atherinidae, Gobiidae, dan Percophidae. Kelimpahan larva ikan pada muara sungai di kelurahan Mangunharjo sebesar 0,53 Ind/L, pada muara sungai di kelurahan Mangkang Wetan memiliki kelimpahan sebesar 0,49 Ind/L, pada muara sungai di daerah Trimulyo sebesar 0,2 Ind/L, dan muara sungai Maron sebesar 0,12 Ind/L. nilai keanekaragaman tertinggi yaitu 1.44 pada muara sungai Maron dan yang terendah bernilai 0 di muara sungai Maron, nilai keseragaman terendah yaitu 0 pada muara sungai Maron dan yang tertinggi pada muara sungai Mangkang Wetan 0,93, nilai dominansi tertinggi yaitu 1 pada muara sungai Maron dan yang terendah 0,17 di Mangunharjo menunjukkan bahwa tidak ada dominansi beberapa lokasi dan terdapat dominansi di salah satu lokasi yaitu muara sungai Maron.Â ABSTRACT :Â Mangrove is one of River mouth ecosystems composer in Semarang which has role as feeding ground, spawning ground, nursery ground and nesting ground of aquatic organisms including fish larvae. The purpose of this study is to determine the community structure of fish larvae involved uniformity, diversity, dominance, abundance and composition in River mouth in Semarang that is Mangkang Wetan, Trimulyo, Maron and Mangunharjo. Sample were collected using 500 Î¼m mesh sizes of Neuston Net and horizontally pulled byÂ boat along 50 meters for 2 minutes. Environmet parameters measrued include temperature, salinity, brightness, depth and pH. Total of fish larvae that found in this research was 101 individuals and 79 indiduals of that has been identified consist of 3 families there are Atherinidae, Gobiidae, and Percophidae. For Mangunharjo (3 families), Mangkang Wetan and Trimulyo (2 families), and Maron (1 families). The abundance of fish larvae in Mangunharjo river mouth is 0,53 ind/L, Mangkang Wetan is 0,49 ind/L, Trimulyo is 0,2 ind/mÂ³, and Maron is 0,12 ind/L. the highest value of diversity index is 1,44 located in river mouth of Mangunharjo and the lowest value is 0 located in Maron, the highest value of uniformity index is 0,93 located in Mangkang Wetan and the lowest value is 0 at Maron, the dominance index show that there is dominance only in one location that is Maron because Maron index value is 1 that is the highest value of dominance index and the lowest value is 0,17 located in Mangunharjo.Â Â

Struktur dan Komposisi Vegetasi Mangrove di Kawasan Pesisir Pulau Sebatik, Kabupaten Nunukan, Kalimantan Timur Ardiansyah, Windy Indra; Pribadi, Rudhi; Soenardjo, Nirwani
977-2407769
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jmr.v1i2.2039

Sebatik Island is one of the main habitat of mangrove ecosystems in Indonesia. Based on the function, one of the mangrove forest resources with huge potential. Mangrove communities occupy the area between land and sea that have environmental conditions differ from one another. This is interesting because the management is still encountered some problems such as the conversion of mangrove forest as an area of fishpond, housing and other interests. The purpose of this study to determine the structure and composition of mangrove vegetation in Coastal Areas of Sebatik Island, Nunukan regency, East Kalimantan. The study was conducted at five locations on the island of Sebatik, the River Stake, Cape Coral, Balansiku, Setabu and Bambangan, each site is divided into 9 transects. Vegetation data retrieval done by the method of sampling survey. Each transect sampling plot made. Each individual tree (plot 10 m x 10 m) and Sapling (subplot 5 m x 5 m) were identified and measured diameter at breast height (Â± 1.3 m). While the calculated number of seedlings of each species and the percentage of closure (plots 1 mx 1 m). Mangrove area. The results indicate the presence of 19 species of mangrove species that fall into 14 families were found at the sites. In general, vegetation of mangrove tree is dominated by Sonneratia alba in Sebatik Island with Importance Value (IV) range from 86.83 - 171.43 % and density 500 ind/ha - 2000 ind/ha, except Bambangan which dominated by Rhizophora apiculata 86.52% and density 100 ind/ha. Sapling category, dominated by species of Sonneratia alba in Balansiku and Setabu with IV 136.65 % and 67.65 % with a density 3200 ind/ha and 1600 ind/ha. Sungai Pancang is dominated by species Avicennia alba with IV 81.64 % and density 2000 ind/ha, Tanjung Karang dominated by species Rhizopohora mucronata with IV 59.24% and density 1200 ind/ha, and Bambangan dominated by species Rhizopohora apiculata with IV 82.76% and density 2000 ind/ha. Seedling category, dominated by species of Sonneratia alba in the Sungai Pancang and Setabu with IV 107.15% and 72.79% with a density 30 000 ind/ha and 60 000 ind/ha, Tanjung Karang and Bambangan dominated by species of Rhizophora apiculata with IV 115.55 % and 136.53% and density 50 000 ind/ha and 150 000 ind/ha. species diversity and evenness was average.

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Location
Kota semarang,

Jawa tengah

INDONESIA