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Abstrak :
Copepoda merupakan zooplankton yang dominan di lautan, dan mempunyai peranan penting dalam rantai makanan di ekosistern perairan, termasuk perairan mangrove (estuarine). Penelitian mengenai Copepoda di perairan mangrove Cilacap, Jawa Tengah, telah dilakukan pada bulan Oktober 1997 dan April 1998. Dari hasil identifikasi ditemukan sebanyak 25 jenis yang termasuk dalam 17 marga, 12 suku, dan 4 bangsa (ordo). Calanoida merupakan ordo yang paling besar, dengan jumlah anggota 17 jenis. Frekuensi kehadiran tertinggi ditemukan pada Acartia erythraea dan Pseudodiaptomus incisus, masing-masing 58,34% dan 52,08%. A. erythraea paling melimpah pada bulan April (rata-rata 7,81% dan 10,59%) dengan kepadatan maksimal 102 ind./l.; sedangkan P. incisus paling melimpah pada bulan Oktober (rata-rata 6,56% dan 14,73%) dengan kepadatan maksimal 62 ind./l. Keanekaragaman jenis Calanoida berkisar antara 0,424-0,849, kemerataan individu tiap jenis 0,256-0,429, kekayaan jenis 0,610-2,471, kesamaan jenis antara dua lokasi 0,182-0,933. Hasil analisis kluster pada musim dan waktu pengamatan yang berbeda, tidak terbentuk pengelompokan. Meskipun demikian terdapat kecenderungan pada St. 1, 2, dan 3 membentuk kelompok yang terpisah dari St. 4. Penyebaran dan kelimpahan Copepoda sangat dipengaruhi oleh salinitas. Kisaran salinitas pada bulan Oktober 18,1-31,7 %0 dan 9,2-29,1 %0 pada bulan April. Selain salinitas, pengaruh musim juga turut menentukan komposisi jenis dan kelimpahan Copepoda.

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Copepods is a dominant group of marine zooplankton, and has an important role in the marine food chain. Copepods lives in various habitats, in freshwater, estuarine, and marine. Information on copepods in Indonesia mostly came from expedition reports on East Indonesian waters. Nevertheless, information concerning copepods in mangrove waters (estuarine) is very limited. The Cilacap mangrove waters has a unique ecosystem. It has high estuarine biodiversity lives, in which of them is copepods. From this fact, a study on the taxonomy and community structure of copepods in Cilacap mangrove waters was conducted on October 1997 and April 1998. The aims of study is to know the diversity and fluctuation of copepods species, the relationship community structure of copepods with the environmental factors in Cilacap mangrove waters, to available information on description and illustration of copepods that area from two seasons. Twenty-five species belonging to 12 families was recorded. They include 17 species of Calanoida, three species of Poecilostomatoida, four species of Cyclopoida, and one species of Harpacticoida. Two species showed high frequency of occurrence and abundance, i.e. Pseudadiaptonius incises at dry season, and Acartia erytlhraea at wet season. This indicated that the two species were common and distributed more widely than others. The highest diversity and richness indices of copepods species were found in Sapuregel (St. 3) at two seasons, and Teluk Penyu had highest evenness index at dry season. Donan mouth river and Sapuregel had the highest similarity index at dry season. Cluster analysis resulted in one group at all study on October 1997 and April 1998. Stations 1, 2, and 3 had the highest relationship than station 4. The water conditions of Cilacap mangrove waters showed that salinity ranged from 9,2-31,7 %0 temperature ranged from 25-32°C, pH ranged from 6,58-8,74, turbidity ranged from 0-7 NTU, DHL ranged from 10,4-44,7 mg/l, and DO ranged from 4,40-8,52 mg/l.

Abstrak :
Telah dilakukan penelitian mengenai struktur komunitas dan sebaran spasial Bivalvia serta hubungannya dengan karakteristik lingkungan di Teluk Katania, Seram Barat, Maluku Tengah. Ada 5 stasiun penelitian yaitu : Pelita Jaya 1, Pelita Jaya 2, Pulau Buntal, Pulau Tatumbu, dan Pulau Burung. Anadara maculafa merupakan jenis Bivalvia yang kepadatannya tertinggi (2,5 individu/m2). Nilai H' (indeks keanekaragaman) Bivalvia tertinggi ada di Pulau Burung (H' = 0,958) dan terendah di Pulau Buntal (H' = 0,624). Indeks kemerataan J' tertinggi (J' = 0,843) terdapat di Pelita Jaya 1. indeks kesamaan Morisita C tertinggi adalah antara Pelita Jaya 2 dan Pulau Buntal (C = 0,92). Kondisi substrat di Pelita Jaya 2 dan Pulau Buntal mempunyai persentase Lumpur yang tinggi. Dengan analisis cluster, 5 stasiun penelitian terbagi menjadi 2 kelompok. Kelompok I terdiri atas stasiun Pelita Jaya 2 dan Pulau Buntal kemudian kelompok II terdiri atas Pelita Jayal, Pulau Tatumbu, dan Pulau Burung. Analisis diskriminan dengan faktor lingkungan substrat pasir halus dan lumpur juga membagi kelima stasiun menjadi dua kelompok yang sama seperti pada analisis cluster. Substrat lumpur mempunyai kontribusi yang tinggi (96,3 %). Tellina sp merupakan jenis yang penyebarannya luas sebab selalu hadir di setiap stasiun penelitian. Hasil analisis faktorial koresponden membentuk enam kelompok. Penyebaran spasial jenis jenis Bivalvia di 5 stasiun dari hasil analisis tersebut berdasarkan pada kepadatan tertinggi dari jenis jenis tertentu (lima kelompok) dan berdasarkan jenis-jenis yang selalu hadir di setiap stasiun (satu kelompok). ......Bivalvia, also known as Pelecypoda, is the second largest class in phylum Mollusca. This group has 28.000 species (Barth & Broshear, 1982) and about 1000 species of Bivalvia live in Indonesian waters (Nontji, 1987). Information about Bivalvia in Kotania Bay has not been known well. Based on those fact, a research on the community structure and spatial distribution of Bivalve in the waters of Kotania Bay was conducted in February 1996. The aim of study was to find out the relationship between Bivalvia community structure with environmental factors in the waters of Kotania Bay. The spatial distribution of Bivalvia in several small islands in Kotania Bay was also studied. Hopefully, the results can be used as basic information for father research. The research was conducted in five stations, i.e. Pelita Jaya 1, Pelita Jaya 2, Buntal Island, Tatumbu Island, and Burung Island. The sampling method used in the study was belt transact. The water conditions measured were water temperature, salinity, and pH. The substrates were characterized by the sediment fractions. Temperatures in the research stations ranged between 29.5°C and 31 °C, the range of pH is between 7 and 8.4. Water salinities in the research stations varied between 22 % and 30 %. Substrates in the research stations mostly contained sand with the very high percentage of very coarse sand. Silt was the smallest fraction found in the substrate. In five research stations, 32 species of Bivalvia belonging to 15 families were collected. Anadara maculata had the highest density (2.5 individulm2) of all Bivalvia species found. The highest H' value (diversity index) of Bivalvia was in Burung Island (H' = 0.958) and the lowest was in Buntal Island (H' = 0.624). The highest evenness index J' = 0.843 was found in Pelita Jaya 1. The highest similarity index was shown by Pelita Jaya 2 and Buntal Island. Substrates in Pelita Jaya 2 and Buntal Island were dominated by silt. Cluster analysis at five research stations divided the stations into two groups. Group I, defined by Pelita Jaya 2 and Buntal Island. Group ii, defined by Pelita Jaya 1, Tatumbu Island, and Burung Island. Discriminant analysis based on two environmental factors, i.e. very fine sand and silts, also divided the stations into two similar groups as cluster analysis did. The silt factor had high contribution (96.3%) in separating the stations. Factorial correspondence analysis classified the species of Bivalvia into six groups. Based on the highest density of the certain species (five groups) and on the common species found in all stations (one group). Among the species collected Tellina sp was the common species found in the five stations. Spondylus squamosus, Trachydarium subrugosum, and Vulsella vulsella were found only in Pelita Jaya 2. Pitar subpellucidus, Septifer hi/ocular-is, Fimbria fmbriata and Chama pacifica were found only in Burung island. The species of Bivalvia only found in Pelita Jaya 1 were Atrina vexillum, Tellina staurella, Chama ruderalis, Limaria fragilis, and Clycymeris pectunculus.

Abstrak :
Ikan tongkol lurik Euthynnus affinis, (Scombridae) merupakan ikan besar yang banyak tertangkap di perairan Laut Jawa. Penelitian ini bertujuan untuk mengetahui komposisi sebaran ukuran ikan tongkol, panjang pertama kali tertangkap, hubungan panjang-berat, pola pertumbuhan, kebiasaan makanan, nisbah kelamin, Tingkat Kematangan Gonad (TKG), Indeks Kematangan Gonad, fekunditas dan diameter telur ikan tongkol yang didaratkan di PPI Labuan. Pengambilan sampel dilakukan pada bulan Mei, Juni, dan September 2012. Hasil penelitian menunjukkan bahwa sebaran frekuensi panjang cagak ikan tongkol yang ditangkap berkisar 38-69 cm ( x = 50 cm). Ukuran pertama kali tertangkap 47,8 cm dengan panjang cagak ikan yang paling banyak tertangkap berkisar 49-51 cm. Hubungan panjang-berat ikan tongkol bersifat allometrik negatif. Ikan tongkol memakan ikan pelagis kecil, cumi dan teri. Nisbah kelamin antara ikan jantan : betina (1:1,4). Tingkat Kematangan Gonad ikan termasuk TKG III dan IV hal ini menunjukkan bahwa ikan dalam masa pemijahan. Indeks Kematangan Gonad rata-rata adalah 4,55%. Faktor kondisi berkisar antara 1,38-2,22. Fekunditas telur berkisar antara 852.000 - 2.056.609 butir dengan rata-rata 1.352.382 butir. Sedangkan diameter telur berkisar 1,28 - 1,8 mm.

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Eastern little tuna Euthynnus affinis (Scombridae) is a pelagic fish which caught excessively in the Java Sea waters. The objective of this research is to determine the composition of these tuna size distribution, lenght at first capture, length-weight relationship, growth pattern, food content, sex ratio, gonad maturity level, gonado stomatic index, fecundity and eggs with diameter of their kind of fish caught and landed in PPP Labuan. Sampling was conducted in May, June and September 2012. The results showed that the frequency distribution of fork lenght caught ranged 38-69 cm (x =50 cm). Size of lenght at first capture is 47.8 cm and most of them ranging from 49-51 cm. Length-weight relationship is allometric negative. The food of this fish species are small pelagic fish, squid and anchovies. Sex ratio the male: female (1:1.4). Gonad maturity level of fish at TKG III and IV indicating that the fishes are in the spawning seasons. Gonad Maturity Index is 4.55%. The condition factor ranged from 1.38 to 2.22. Fecundity ranged from 852,000 - 2,056,609 eggs (average 1,352,382 eggs). While the eggs diameter ranged from 1.28 to 1.8 mm.

Abstrak :
Peningkatan gas CO2 di atmosfer dapat mengakibatkan peningkatan suhu rata-rata di bumi yang dapat menyebabkan perubahan iklim. Padang lamun, salah satu komunitas penyusun ekosistem pesisir pantai memiliki fungsi yang dapat dipertimbangkan sebagai penyerap dan penyimpan karbon. Penelitian ini bertujuan untuk menganalisis laju penyerapan karbon dan potensi tiap jenis lamun sebagai penyimpan karbon serta mengestimasi total kandungan karbon komunitas lamun. Penelitian dilakukan pada bulan Januari - Juni 2013 di Pulau Pramuka, Kepulauan Seribu, DKI Jakarta. Data diperoleh dengan menggunakan metode transek kuadrat untuk menentukan struktur komunitas dan biomassa. Pengukuran pertumbuhan dan produksi daun lamun dilakukan dengan metode penandaan daun, sementara untuk produktivitas serasah menggunakan metode kurungan. Analisis kandungan karbon dalam bagian tanaman lamun dan serasah lamun dilakukan dengan metode Walkley & Black. Hasil menunjukan bahwa rata-rata laju penyerapan karbon di Pulau Pramuka sebesar 0,53 gC/m2/hari. Dua jenis lamun yang mempunyai laju penyerapan karbon yang tinggi yaitu Thalassia hemprichii (1,69 gC/m2/hari) dan Cymodocea rotundata (0,65 gC/m2/hari), sedangkan jenis lamun yang memiliki cadangan karbon yang tertinggi yakni Enhalus acoroides (139,95 gC/m2) diikuti oleh Thalassia hemprichii (56,87 gC/m2) dan yang terendah ditemukan pada Halophila ovalis (1,91 gC/m2). Rata-rata cadangan karbon pada komunitas lamun Pulau Pramuka sebesar 200,90 gC/m2. Berdasarkan estimasi, total luas padang lamun di Pulau Pramuka sebesar 59,25 ha, sehingga total kandungan karbon yang diperoleh yakni 119,03 ton atau setara dengan 2,01 ton/ha dan jumlah CO2 yang diserap oleh padang lamun Pulau Pramuka yakni sekitar 436,84 ton CO2. ......The increase of CO2 in the atmosphere may caused the increasing average temperature of the earth, which could cause climate change. Seagrass beds, one of the constituent communities and coastal ecosystems has a function that can be considered as a carbon sink and carbon stock. This study aims to analyze the rate of carbon sequestration and the potential of each species of seagrass as a carbon sink as well as estimating total carbon stock in seagrass communities. The study was conducted in January - June 2013 in the Pramuka Island, Seribu Islands, Jakarta. Data obtained using quadratic transect method for determining community structure and biomass of seagrass. Measurement of seagrass growth and leaf production is done by the leaf marking method, while for leaf litter productivity using cages method. Analysis percentage of carbon in the plant parts of seagrass and seagrass leaf litter carried by Walkley & Black method. The results show that the average rate of carbon sequestration at Pramuka Island is 0,53 gC/m2/day. There are two species of seagrass that have a high rate of carbon sequestration is Thalassia hemprichii (1,69 gC/m2/day) and Cymodocea rotundata (0,65 gC/m2/day). While seagrass species that has the highest carbon stocks that Enhalus acoroides (139,95 gC/m2) followed by Thalassia hemprichii (56,87 gC/m2) and the lowest was found in Halophila ovalis (1,91 gC/m2). Average carbon stock in seagrass communities Pramuka Island at 200,90 gC/m2. Based on estimates​​, the total area of ​​seagrass beds at Pramuka Island of 59,25 ha. The total carbon stock can be determined that 119,03 tons, or equivalent to 2,01 tons/ha and the amount of CO2 absorbed by seagrass Pramuka Island which is about 436,84 tons of CO2.

Abstrak :
Penelitian ini bertujuan untuk menduga jumlah produksi penangkapan dan jumlah upaya penangkapan kerapu sunu yang dapat memberikan keuntungan optimal baik secara ekonomi maupun secara biologi. Parameter ekonomi yang digunakan dalam penelitian ini adalah harga, biaya input dengan menggunakan Indeks Harga Konsumen (IHK) Provinsi Sulawesi Tenggara. Selain itu, dalam penelitian ini juga menggunakan parameter biologi seperti pertumbuhan biologi, koefisien daya tangkap, daya dukung lingkungan yang diestimasi dengan menggunakan Surplus Produksi Walters dan Hilborn yang mengikuti pertumbuhan logistik dan Surplus Produksi CYP yang mengikuti pertumbuhan Gompertz. Alat tangkap yang dioperasikan adalah pancing dan bubu lipat. Hasil perhitungan pada tingkat bunga 34 persen pertumbuhan logistik menunjukkan bahwa biomassa optimal (x*) 47,09 ton per tahun, penangkapan optimal (h*) 52,37 ton per tahun dan upaya optimal (E*) 44.776 per trip per tahun, rente ekonomi diperoleh sebesar Rp 3,648 milyar per tahun, sedangkan model pertumbuhan Gompertz menunjukkan bahwa biomassa optimal (x*) 9,09 ton per tahun, penangkapan optimal (h*) 43,92 ton per tahun dan upaya optimal (E*) 36.379 per trip per tahun, sedangkan rente ekonomi atas sumberdaya kerapu sunu diperoleh sebesar Rp 3,108 milyar per tahun. Persentase tingkat pemanfaatan JTB (jumlah tangkapan yang dibolehkan) sebesar 90,57% dengan effort JTB sebesar 50,85%. ......This study aims to predict the amount of production, arrests and number of coral trout grouper fishing effort that can provide optimal benefit both economically and biologically. Economic parameters used in this study are prices, input costs by using the consumer price index (CPI) southeast Sulawesi province. In addition, in this study also uses biological parameters such as growth biology, capture power coefficient, the estimated carrying capacity of the environment by using surplus production Walters and Hilborn who follow logistic growth and the surplus production CYP follow Gompertz growth. Fishing gear is fishing and fish traps operated folding. The results of calculations at an interest rate of 34 percent growth in logistics show that optimal biomass (x*) 47,09 tons per year, optimal harvest (h*) 52,37 tons per year and the optimal effort (E*) 44.776 per trip per year with economic resources rent Rp 3,648 billion by logistic growth of model and Gompertz growth of model showed optimal biomass (x*) 9,09 ton, optimal harvest (h*) 43,92 ton and optimal effort (E*) 36.379 per trip with economic resources rent Rp 3,108 billion. JTB percentage utilization rate (the number of attempts allowed) of 90,57 % with 50,85 % of JTB effort.

Abstrak :
Statistik yang mencatat produksi secara akurat untuk jenis ikan kurisi di Indonesia baik secara nasional maupun daerah, belum ada. Untuk itu dilakukan penelitian yang dapat memberikan informasi mengenai status dan stok potensi ikan kurisi jenis ini di Laut Jawa bagi pemangku kepentingan dan pemerintah. Hal tersebut dilakukan dengan menganalisis status stok ikan kurisi dengan metode Swept Area, mengkaji selektivitas alat trawl yang dapat menjamin rekrutmen ikan kurisi dan menganalisis semua informasi yang berguna bagi pengelolaan ikan kurisi sehingga perikanan kurisi tetap lestari di perairan Tanjung Karawang. Hasil penelitian menentukan bahwa stok ikan kurisi di daerah penangkapan di Tanjung Karawang adalah 60.445 kg/m2 sedangkan hasil penangkapan ikan kurisi sebesar 765,1 kg/m2 atau 1,26 %. Ternyata jaring trawl yang berkantung 3 inci lebih selektif daripada jaring trawl berkantung 2 inci dan 1 inci. Untuk kelestarian perikanan ikan kurisi di Laut Jawa dianjurkan memakai jaring trawl dengan kantung bermata jaring 3 inci.

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In fact in Indonesia there has been not an accuratedy been no production statistics are recorded accurately for Kurisi fish species both national and local. This study is expected to provide information on the status and potential of kurisi stocks type this in the Java Sea. Especially for stakeholders and government. Analyzing the status kurisi stocks with Swept area method in the Java Sea. Assessing trawl selectivity tool that can ensure recruitment Kurisi fish in the Java Sea. Analyzing all the useful information for the management of fish Kurisi so Kurisi remain sustainable fisheries in the Java Sea. Stock assessment and selectivity of trawling on fish Kurisi. In the waters of Tanjung Karawang, Java Sea. The study found that fish stocks in the area Kurisi arrest in Tanjung Karawang is (Maximum Sustainable Yield) 60 445 kg/m2 while the catch Kurisi of 765.1 kg/m2 or 1.26%, meaning not happen over fishing. Turns trawl nets pockets 3 inches more selective trawl nets pockets than 2 inches and 1 inch. Seen from a lot of fish that escaped from the bag Kurisi trawl nets as follows: the level of the break-out fish in bag 3 inches by 80.8%, on a 2-inch by 34.5% and the 1-inch by 14.9%. For the sustainability of fisheries in the Java Sea Kurisi fish can also be used trawl nets with 3-inch-edged pockets.

Abstrak :
Telah dilakukan penelitian untuk mengetahui keragaman genetik udang mantis di perairan pesisir Kabupaten Tangerang selama bulan Januari ? Desember 2015. Pengambilan sampel larva Stomatopoda dilakukan sebanyak 3 kali yaitu pada bulan Februari, Juli dan Sepember pada 4 stasiun penelitian yang terdapat di antara Tanjung Kait dan Muara Sungai Cisadane. Stomatopoda dewasa juga diambil sebanyak 1 kali pengambilan sebagai data konfirmasi dengan identifikasi secara morfologi. Empat spesies udang mantis dewasa berhasil diidentifikasi dari 37 individu yang didadapat. Keempat jenis tersebut antara lain Erugosquilla woodmasoni, Odontodactylus sp., Harpiosquilla harpax, dan Miyakea nepa. Dua puluh empat larva Stomatopoda berhasil didapatkan menggunakan jaring plankton pada 3 kali pengambilan sampel. Hanya 12 larva yang berhasil diamplifikasi gen Cytochrome oxidase sub unit 1 untuk identifikasi molekular menggunakan mesin PCR SimplyAmp Biosystem. Seluruh gen yang berhasil diamplifikasi dikirim ke Macrogen Korea untuk proses sekuensing. Hasil akhir menunjukkan terdapat 4 grup kekerabatan berdasarkan sekuens yang terdapat pada bank gen yaitu Oratosquilla interrupta, Harpiosquilla harpax, Stomatopoda sp. 1 BTN-2013 yang merupakan hasil sekuens penelitian sebelumnya dari Mariana dkk. (2013), dan Oratosquilla oratoria dengan nilai identitas 85% (NCBI 2015). Sebaran Stomatopoda di pesisir Tangerang cenderung menjauhi bagian muara sungai yang ditunjukkan dengan jumlah individu yang didapat lebih banyak pada stasiun 1 dan 3. ...... The research was conducted to know mantis shrimp genetic diversity in Tangerang coastal area for periode of January--Desember 2015. The larva of Stomatopoda was sampled 3 times in February, July and September on 4 sampling stations betwen Tanjung Kait and the estuary of Cisadane river. Mature Stomatopoda was sampled once as confirmation data by morfological identification. Four species of mature Stomatopoda had been identified from 37 individuals, those are Erugosquilla woodmasoni, Odontodactylus sp., Harpiosquilla harpax, and Miyakea nepa. Twenty four larvas were found using plankton net in 3 times of sampling. Only 12 from all larvas have been successfully amplified for the sequence of Cytochrome Oxidase sub unit 1 (CO1) using PCR SimplyAmp Biosystem machine. All amplified gene were sent to macrogen for sequencing procedure. The result shown 4 group closely related to species Oratosquilla interrupta, Harpiosquilla harpax, Stomatopoda sp. 1 BTN-2013 sequence from early research by Mariana et al. (2013), and Oratosquilla oratoria with identities 85% (NCBI 2015). The Distribution of Stomatopoda in Tangerang coastal area tend to getting far from the estuary which are statiun 1 and 3 showed the larger amount of individu.

Abstrak :
Salah satu sumberdaya perikanan di Wilayah Pengelolaan Perikanan WPP 573 Samudera Hindia Selatan Jawa adalah ikan cakalang. Ikan tersebut merupakan ikan pelagis yang termasuk dalam ikan ekonomis penting. Pada tahun 2008 ndash;2016, hasil tangkapan ikan cakalang yang tertangkap di WPP 573 dan didaratkan pada PPN Palabuhanratu menunjukkan telah terjadi penurunan yang diduga mengalami eksploitasi berlebihan sehingga memengaruhi ketersediaan stok sumberdaya ikan tersebut. Penelitian ini bertujuan untuk mengetahui aspek ndash;aspek biologi, ekologi, dan perikanan serta menganalisis selektivitas penggunaan alat penangkap ikan cakalang. Metode yang digunakan yaitu melalui pengambilan sampel secara acak ikan cakalang yang tertangkap dengan pancing tonda dan rawai tuna serta wawancara kepada nelayan. Musim penangkapan ikan cakalang yang paling produktif, yaitu pada musim timur, ketika terjadi upwelling yaitu pada bulan Juni - Oktober di WPP 573. Secara umum ikan cakalang yang tertangkap telah melakukan pemijahan atau reproduksi, yaitu pada TKG III sebesar 44 dengan panjang cagak 41 ndash;45 cm. Nilai potensi lestari maksimum MSY dengan pancing tonda sebesar 230.813,9 kg/tahun dengan upaya penangkapan optimum fopt sebesar 228 trip dan CPUEopt sebesar 1.013,55 kg/trip serta tingkat pemanfaatan sebesar 91,69 . Pancing tonda masih dapat dikategorikan layak ramah lingkungan untuk penangkapan ikan cakalang dengan ukuran mata pancing nomor 6 panjang 5,2 cm dan lebar 2,2 cm . ......One of fishery resources in Fishery Management Area 573 Indian Ocean, South of Java is skipjack tuna. The fish is a pelagic fish and economically importance. The catches showed decreasing tendency during period 2008 ndash 2016. This implied that there were overexploitation on skipjack tuna fishing, especially the ones that used the troll line fishing, so as affect the availability of fish resources. This study was conducted to know the selectivity fishing gear of skipjack tuna in June ndash August 2016. Some aspects of biology, ecology, fishery of skipjack tuna were analyzed. The results showed that the fishing season of skipjack tuna occurred in Southeast monsoon, especially during upwelling time in June - October at Indian Ocean, South of Java Island. In general, skipjack tuna were caught in mature condition at 41 ndash 45 cm FL, it means that the fishes were already spawning before caught. The MSY of skipjack tuna found was about 230,813.9 kg year with CPUE optimum 1,013.55 kg trip, effort optimum were 228 trips and the utilization rate was about 91.69. It is suggested that troll line fishery for skipjack tuna still have a good opportunity environmentally friendly to be developed with hook size number 6 length 5,2 cm and width 2,2 cm.

Abstrak :
Penelitian ini dilaksanakan pada bulan Februari 2015 - Mei 2015 terhadap ikan tembang yang didaratkan di PPP Tegalsari Kota Tegal dan PPP Tasikagung Kabupaten Rembang. Bertujuan untuk menganalisis kondisi bioekonomi sumberdaya ikan tembang pada pada rezim pengelolaan MSY, MEY dan Open Access dan melihat tingkat depresiasi sumberdaya. Penghitungan terdiri dari parameter biologi (model Fox, Clark-Yoshimoto-Pooley, Schnute dan Walter Hillborn) dan parameter ekonomi (biaya riil penangkapan, indeks harga ikan dan discount rate). Produksi ikan tembang di lokasi penelitian dihasilkan oleh kapal jenis purse seine (pukat cincin). Metode pengambilan sampel dilakukan secara purposive sampling dan data bioekonomi diolah menggunakan perangkat lunak microsoft excel 2013 dan Maple 18. Data yang diolah meliputi jumlah tangkapan ikan, jumlah trip kapal, dan nilai produksi. Aktifitas penangkapan ikan berlebih secara biologi dan ekonomi diduga telah terjadi di 2 lokasi penelitian. Tingkat overfishing terkecil berdasarkan model Fox yang terjadi di kota Tegal dan kabupaten Rembang, masing-masing sebesar 9,17% dan 6,66%, dan persentase kehilangan nilai sustainable rent di kota Tegal dan Kabupaten Rembang, masing-masing sebesar 44,28% dan 9,68% dari PDRB di masing-masing wilayah. ...... This study was conducted in February 2015 until May 2015 in PPP Tegalsari Kota Tegal and PPP Tasikagung Rembang. This study aimed to analyze the condition of the bioeconomy of ikan tembang on the management regime MSY, MEY and Open Access and view depressiation. Depreciation rates used consisted of biological parameters (Model fox, CYP, walter-hilbor and Schnute) and economic parameters (real cost, fuel, logistic etc). Fish production in research location produced by vessel type of purse seine. The sampling method is purposive sampling and the data is processed using microsoft excel 2013 and Maple 18. The processed data includes the number of fish caught, the number of boat trips, and production value. Activity overfishing biologically and economically alleged to have occurred in the two study sites. The level of overfishing that occurred in Tegal and Rembang district, respectively 9.17% and 6.66%. The percentage loss in value sustainable rent in the town of Tegal and Rembang, respectively 44.28% and 9.68% of the GDP in each region.