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Abstrak :
Fenomena penurunan sumberdaya ikan layur di perairan Cilacap dan sekitarnya terjadi disebabkan peningkatan laju eksploitasi.tanpa mempertimbangkan dinamika atau perubahan stok ikan dan aspek optimasi pemanfaatan. Penelitian ini bertujuan untuk mengkaji dinamika populasi ikan layur tingkat pemanfaatan, dan optimasi pemanfaatannya di perairan Cilacap dan sekitarnya. Penelitian dilaksanakan di PPS Cilacap dan lokasi penelitian di perairan Cilacap dan sekitarnya dari bulan April 2013 sampai Juni 2014. Metode yang digunakan adalah metode survey dengan pengambilan ikan layur yang tertangkap oleh alat tangkap jaring sirang dan jaring payang. Analisis dinamika populasi digunakan program FiSAT II dan pengkajian potensi lestari dianalisis dengan model surplus produksi dalam menentukan Maximum Sustainable Yield (MSY). Sementara optimasi pemanfaatan dilakukan dengan analisis Linier Programing terhadap aspek-aspek yang terkait dengan pemanfaatan ikan layur. Kisaran panjang total dan modus panjang 13-77 cm dan 51 cm. Ikan layur allometrik negatif, dengan nilai Lc < Lm yang menunjukkan sebagian besar ikan layur yang tertangkap dengan alat tangkap yang digunakan di perairan selatan Cilacap belum memijah / belum dewasa. Nilai parameter pertumbuhan adalah L∞ = 80,85 cm, K= 0,70 per tahun, to= -0,1748, Z = 2,18 per tahun, M = 1,07 per tahun, F = 1,11 per tahun, dan E = 0,51. Nilai menunjukkan tingkat pemanfaatan sudah fully exploited. Pendugaan MSY dan F-Opt sebesar 626,318 ton/tahun dan 1.173 unit dengan alat tangkap standar jaring sirang. Skenario optimasi menghasilkan jenis alat tangkap yang direkomendasikan yaitu 1.173 unit alat tangkap jaring sirang dengan keuntungan Rp. 78,3 milyar per tahun. ......The phenomenon occurs due to a decrease of hairtai resources in Cilacap water area because eksploitation without consider increasing the rate or change the dynamics of fish stocks and utilization optimization aspects. This study aims to examine the dynamics of hairtail populations utilization rates and utilization optimization in Cilacap area and the surrounding waters. Research carried out in the PPSC (Pelabuhan Perikanan Samudera Cilacap) and research sites in Cilacap and surrounding waters from April 2013 to June 2014. Methods used is a survey method with hairtail fishing gear caught by sirang nets (gillnet monofilament) and payang nets (denish seine). Analysis of population dynamics used FiSAT II program and assessment of the potential sustainable surplus production models were analyzed with Maximum Sustainable Yield (MSY) in determining. While optimization is done with the use of Linear Programming analysis of aspects related to the use of hairtail. Range in total length and long mode 13-77 cm and 51 cm. Hairtail is negative allometric, with a value of Lc < Lm which shows hairtail caught with fishing gear used in Cilacap and surrounding waters not spawn / immature. Growth parameter values L∞ = 80.85 cm, K 0.70 = per year, to = -0.1748, Z = 2.18 per year, M = 1.07 per year, F = 1, 11 per year, and E = 0.51. Value indicates the level of utilization has been fully exploited. Estimation of MSY and f-Opt for 626.318 tons / year and 1,173 units with standard fishing gear is gill net sirang. Scenario optimization produces the type of fishing gear is recommended that 1,173 units of gillnet sirang with a net profit Rp 40.9 billion per year.

Abstrak :
[ABSTRAK
Ikan kurisi merupakan salah satu ikan ekonomis penting di perairan Tangerang dan sekitarnya. Intensitas pemanfaatan sumberdaya ikan kurisi akhirakhir ini semakin meningkat, seiring dengan meningkatnya permintaan akan komoditas ini terutama untuk bahan surimi. Penelitian bertujuan mengkaji aspek biologi ikan kurisi (N. peronii), potensi dan tingkat pemanfaatan, serta optimasi pemanfaatannya di perairan Tangerang. Metode yang digunakan adalah metode survey dengan sampel ikan kurisi pada alat tangkap cantrang dan apollo. Analisis parameter populasi digunakan program FiSAT II dan pengkajian potensi lestari Maximum Sustainable Yield (MSY) dianalisis dengan model surplus produksi. Optimasi pemanfaatan dilakukan dengan analisis Linier Programing. Hasil penelitian menunjukkan pola pertumbuhan ikan kurisi bersifat allometrik negatif. Panjang dan berat ikan kurisi berkorelasi erat. Ukuran panjang pertama kali tertangkap (Lc) 16,34 cm. Parameter pertumbuhan menunjukkan ikan kurisi diperkirakan mampu mencapai panjang 28,03 cm dengan laju pertumbuhan lambat sebesar 0,49 cm per tahun. Laju mortalitas lebih besar disebabkan oleh kematian alami. Tingkat eksploitasi masih berada di bawah nilai optimum dan perlu kehati-hatian dalam pengelolaannya. Pendugaan MSY dan F-Opt sebesar 494 ton/tahun dan 743 unit alat tangkap standar cantrang. Dari analisis optimasi menghasilkan jenis alat tangkap yang direkomendasikan yaitu 743 unit alat tangkap cantrang.

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ABSTRACT
Threadfin bream is one of the important and high economical fish that can be found in Tangerang?s waters and its surounding. The use of threadfin bream increases nowadays, alligned with the increasing demand of these commodities, especially for Surimi. The research is aimed to exercise the biological aspects of threadfin bream (N. peronii); the potential and the number of utilization of it, as well as the optimization of water utilization in Tangerang.The research method used by the writer was a survey method using threadfin bream caught by fishing gear named Cantrang and Apollo as the samples.The writer used FiSAT II program to do the analysis of population parameters, and used a surplus production model to assess the Maximum Sustainable Yield (MSY). Linear Programming Analysis was used to analize the use of optimization. The research?s result showed that the growing pattern of threadfin bream was negative allometric. There was a close correlation between the length and weight of the growing fish with their length when first being caught (Lc) 16.34 cm. Threadfin bream?s growth parameters showed that threadfin bream were expected to grow until 28.03 cm long, with a slow growth rate is 0.49 cm per year. Mortality rate was caused by natural fish death. The level of exploitation below the maximum value, so it needs to be managed prudentially. The estimation of MSY and F - Opt are 494 tons/ year, and 743 units of standard Cangkrang fishing gear. From the analysis of optimization, it produced the types of recommended fishing gears, 743 units of Cantrang fishing gear.;Threadfin bream is one of the important and high economical fish that can be found in Tangerang’s waters and its surounding. The use of threadfin bream increases nowadays, alligned with the increasing demand of these commodities, especially for Surimi. The research is aimed to exercise the biological aspects of threadfin bream (N. peronii); the potential and the number of utilization of it, as well as the optimization of water utilization in Tangerang.The research method used by the writer was a survey method using threadfin bream caught by fishing gear named Cantrang and Apollo as the samples.The writer used FiSAT II program to do the analysis of population parameters, and used a surplus production model to assess the Maximum Sustainable Yield (MSY). Linear Programming Analysis was used to analize the use of optimization. The research’s result showed that the growing pattern of threadfin bream was negative allometric. There was a close correlation between the length and weight of the growing fish with their length when first being caught (Lc) 16.34 cm. Threadfin bream’s growth parameters showed that threadfin bream were expected to grow until 28.03 cm long, with a slow growth rate is 0.49 cm per year. Mortality rate was caused by natural fish death. The level of exploitation below the maximum value, so it needs to be managed prudentially. The estimation of MSY and F - Opt are 494 tons/ year, and 743 units of standard Cangkrang fishing gear. From the analysis of optimization, it produced the types of recommended fishing gears, 743 units of Cantrang fishing gear., Threadfin bream is one of the important and high economical fish that can be found in Tangerang’s waters and its surounding. The use of threadfin bream increases nowadays, alligned with the increasing demand of these commodities, especially for Surimi. The research is aimed to exercise the biological aspects of threadfin bream (N. peronii); the potential and the number of utilization of it, as well as the optimization of water utilization in Tangerang.The research method used by the writer was a survey method using threadfin bream caught by fishing gear named Cantrang and Apollo as the samples.The writer used FiSAT II program to do the analysis of population parameters, and used a surplus production model to assess the Maximum Sustainable Yield (MSY). Linear Programming Analysis was used to analize the use of optimization. The research’s result showed that the growing pattern of threadfin bream was negative allometric. There was a close correlation between the length and weight of the growing fish with their length when first being caught (Lc) 16.34 cm. Threadfin bream’s growth parameters showed that threadfin bream were expected to grow until 28.03 cm long, with a slow growth rate is 0.49 cm per year. Mortality rate was caused by natural fish death. The level of exploitation below the maximum value, so it needs to be managed prudentially. The estimation of MSY and F - Opt are 494 tons/ year, and 743 units of standard Cangkrang fishing gear. From the analysis of optimization, it produced the types of recommended fishing gears, 743 units of Cantrang fishing gear.]

Abstrak :
ABSTRAK
Jaring insang (gill net) dengan 3 ukuran mata jaring merupakan alat tangkap utama untuk menangkap ikan bawal hitam (Parastromateus niger) di Perairan Sambas, Kalimantan Barat. Sampai saat ini belum diketahui ukuran mata jaring mana yang paling ramah lingkungan untuk memanfaatkan sumberdaya ikan demersal. Tujuan penelitian ini adalah untuk mengetahui dan menganalisis komposisi jenis, aspek biologi, ikan dominan dan ukuran mata jaring insang yang ramah lingkungan. Hasil penelitian menunjukkan komposisi jenis hasil tangkapan jaring insang terdiri dari 35 jenis dimana yang mendominasi adalah ikan bawal hitam (24,57 %). Kondisi biodiversitas berada dalam kategori sedang dan komunitas berada dalam keseimbangan. Pertumbuhan ikan bawal hitam bersifat allometrik dengan kebiasaan makan bersifat herbivore yang cenderung omnivore. Ukuran ikan bawal hitam yang tertangkap dipengaruhi oleh ukuran mata jaring, semakin besar ukuran mata jaring maka semakin besar ikan yang tertangkap. Ukuran mata jaring insang yang paling ramah lingkungan adalah ukuran 8 inchi karena hasil tangkapannya lebih besar dan bermutu lebih baik. Untuk mendukung perikanan jaring insang yang melestarikan sumberdaya bawal hitam sebaiknya digunakan satu ukuran mata jaring saja yaitu jaring insang yang berukuran mata jaring 8 inchi.

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ABSTRACT
Gill nets with 3 mesh size is the main fishing gear to catch black pomfret (Parastromateus niger) in the waters of Sambas, West Kalimantan. Until now unknown mesh sizes which are the most environmentally friendly to use resources demersal fish. The purpose of this study was to determine and analyze the composition of types, biological aspects, the dominant fish gill and mesh sizes that are environmentally friendly. The results showed the species composition of the catch gill net consists of 35 species which is dominated by black pomfret fish (24.57%). Conditions of biodiversity are in the medium category and communities are in balance. Black pomfret fish growth is allometric with eating habits that tend to be herbivore omnivore. Size black pomfret fish caught influenced by mesh size, the larger the mesh size, the greater the fish are caught. Mesh size gill most environmentally friendly is a size 8 inches because catch bigger and better quality. To support the gill net fishery that conserve resources should be used black pomfret the mesh size, ie gill net mesh size 8 inches.

Abstrak :
Perairan Cilacap dan sekitarnya merupakan salah satu daerah penangkapan udang jerbung yang sangat potensial di perairan pantai selatan Jawa. Trend indeks kelimpahan stok udang jerbung di perairan Cilacap dan sekitarnya cenderung menurun pada periode tahun 2004-2010. Hal ini sangat mengkhawatirkan terhadap keberlanjutan produksi udang jerbung apabila tidak ada pengelolaan dan pemanfaatan sumberdaya udang tersebut dengan baik. Penelitian ini dilaksanakan di Cilacap dan sentra perikanan udang lainnya di Kabupaten Cilacap pada Januari sampai dengan November 2013. Data dikumpulkan melalui metode survey dan wawancara. Metode analisis terdiri dari metode analitik menggunakan Program FiSAT II, dan model surplus produksi. Udang jerbung yang tertangkap dominan pada mid length 31 mm, 33 mm, dan 35 mm, dan umumnya belum dewasa. Nilai faktor kondisi udang jerbung betina dan jantan masing-masing berkisar 37,36-648,87 dan 15,55-319,05. Laju pertumbuhan (K) udang jerbung betina 1,10 per tahun dan udang jerbung jantan 1,00 per tahun. Laju eksploitasi (E) udang jerbung betina 0,36 per tahun dan udang jerbung jantan 0,56 per tahun. Laju mortalitas total (Z) udang jerbung betina 1,69 per tahun dan udang jerbung jantan 2,46 per tahun. Pola rekruitmennya menunjukkan 2 modus dalam satu tahun, dengan puncak terjadi pada periode Maret-April dan periode Juli-Agustus. Estimasi potensi lestari (MSY) dan f-opt udang jerbung di perairan Cilacap 326 ton/tahun dan effort optimum (f-opt) 231 trip serta tingkat pemanfaatan sudah berada pada tahap overfishing. ...... Cilacap and surrounding waters is one of the potential fishing ground of banana prawn in south of Java sea. Abundance stock index of banana prawn in Cilacap and surrounding waters tend to decline in 2004-2010. It was apprehension for the banana prawn sustainability, when no appropriate management and utilization for this species. This research conducted in Cilacap and other shrimp fisheries centers in Cilacap District begin from January until November 2013. Data collected through a survey and interview methods. The method of analysis consists of : an analytical method by FiSAT II program, and surplus production models. Most of Banana prawn caught dominantly in the mid length 31 mm, 33 mm, and 35 mm, and generally immature. Value factor condition banana prawn females and males respectively ranged from 37.36-648.87 and 15.55-319.05. Growth rate (K) of banana prawn female was 1.10 per year and banana prawn male was 1.00 per year. The exploitation rate (E) of banana prawn female was 0.36 per year and banana prawn male was 0.56 per year. Total mortality rate (Z) of banana prawn female was 1.69 per year and banana prawn male was 2.46 per year. The pattern of recruitment showed two models in one year, with the peak season occur in the period of March-April and July-August. Estimation of the Maximum Sustainable Yield (MSY) and f-opt banana prawn in Cilacap waters about 326 tons/year and optimum effort (f-opt) about 231 trips, and the utilization rate toward to overfishing level.

Abstrak :
[ABSTRAK
Terdapatnya upaya tangkap udang dogol (Metapenaeus ensis, De Haan 1844 ) di perairan Cilacap dan sekitarnya yang berlebih maka perlu dilakukan penelitian yang bertujuan untuk mengkaji dinamika populasi, tingkat pemanfaatan dan optimasi pemanfaatan udang dogol di perairan Cilacap dan sekitarnya. Penelitian dilaksanakan di perairan Cilacap dan sekitarnya dari bulan Januari 2013 sampai Desember 2014. Metode yang digunakan adalah metode survei dengan pengambilan sampel udang dogol yang tertangkap oleh alat tangkap arad dan trammel net. Analisis dinamika populasi menggunakan program FiSAT II dan pengkajian potensi lestari dianalisis dengan menggunakan model surplus produksi dalam menentukan Maximum Sustainable Yield (MSY). Optimasi pemanfaatan dilakukan dengan analisis Linier Programming terhadap aspek-aspek yang terkait dengan pemanfaatan udang dogol. Udang dogol di perairan ini memiliki pola pertumbuhan allometrik negatif, dengan nilai Lc > Lm yang menunjukkan sebagian besar udang dogol yang tertangkap di perairan ini sudah memijah. Nilai parameter pertumbuhan yaitu L∞: 55.8 mm, K: 1,18 per tahun, to: 0,1129, Z: 7,09 per tahun, M: 0,8 per tahun, F: 6,29 per tahun, dan E: 0,88. Nilai E menunjukkan tingkat pemanfaatan sudah melebihi batas ekploitasi dan sudah terjadi overfishing. Pendugaan MSY dan f-Opt sebesar 57 ton/tahun dan 392 unit alat tangkap standar trammel net. Skenario optimasi pemanfaatan udang dogol di perairan Cilacap dan sekitarnya yang paling menguntungkan dan lestari adalah dengan mengoperasikan 392 unit jaring trammel net dengan keuntungan Rp. 35,2 milyar per tahun.

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ABSTRACT
There were an excessive fishing effort of greasyback shrimp (Metapenaeus Ensis, De Haan 1844) in Cilacap Waters, so it is necessary to study the population dynamics, the level of utilization and optimization of greasyback shrimp in Cilacap waters. Research was conducted in Cilacap and surrounding waters from January 2013 to December 2014. The method used was survey method using samples of Greasyback Shrimp that were caught by fishing gear Arad and trammel net. Analysis of population dynamics used FiSAT II program. Assessment of the maximum sustainable yield was analyzed using surplus production models in order to determine the Maximum Sustainable Yield (MSY). The optimization of the utilization of Linear Programming was done using analysis of aspects related to the use of greasyback shrimp. Greasyback Shrimp growth in the Cilacap waters moreover negative allometric, with a value of Lc> Lm which show that most of Greasyback Shrimp caught with fishing gear used in waters Cilacap already in spawning condition. Value of growth parameters L∞: 55.8 mm, K: 1.18 per year, to: 0.1129, Z: 7.09 per year, M: 0.8 per year, F: 6.29 per year, and E: 0.88. The value of E indicate that the utilization rate has exceeded the limits of exploitation (overfishing). Base on surplus production models analysis estimation of MSY was 57 tons / year while f-Opt for and 392 units using standard trammel net fishing gear. Optimization scenarios of Greasyback Shrimp in the Cilacap waters was the use of the most profitable and sustainable ways to operate 392 units trammel nets with a net profit of Rp. 35.2 billion per year, There were an excessive fishing effort of greasyback shrimp (Metapenaeus Ensis, De Haan 1844) in Cilacap Waters, so it is necessary to study the population dynamics, the level of utilization and optimization of greasyback shrimp in Cilacap waters. Research was conducted in Cilacap and surrounding waters from January 2013 to December 2014. The method used was survey method using samples of Greasyback Shrimp that were caught by fishing gear Arad and trammel net. Analysis of population dynamics used FiSAT II program. Assessment of the maximum sustainable yield was analyzed using surplus production models in order to determine the Maximum Sustainable Yield (MSY). The optimization of the utilization of Linear Programming was done using analysis of aspects related to the use of greasyback shrimp. Greasyback Shrimp growth in the Cilacap waters moreover negative allometric, with a value of Lc> Lm which show that most of Greasyback Shrimp caught with fishing gear used in waters Cilacap already in spawning condition. Value of growth parameters L∞: 55.8 mm, K: 1.18 per year, to: 0.1129, Z: 7.09 per year, M: 0.8 per year, F: 6.29 per year, and E: 0.88. The value of E indicate that the utilization rate has exceeded the limits of exploitation (overfishing). Base on surplus production models analysis estimation of MSY was 57 tons / year while f-Opt for and 392 units using standard trammel net fishing gear. Optimization scenarios of Greasyback Shrimp in the Cilacap waters was the use of the most profitable and sustainable ways to operate 392 units trammel nets with a net profit of Rp. 35.2 billion per year]

Abstrak :
Perairan Kabupaten Bengkalis dan sekitarnya, merupakan salah satu perairan yangintensif dengan kegiatan pemanfaatan sumberdaya udang jerbungnya. Data produksiudang jerbung 540,38 ton tahun 2014 lebih tinggi dibandingkan dengan spesiesudang lainnya 317,7 ton . Penelitian ini dilaksanakan di perairan KabupatenBengkalis pada Januari 2014 sampai dengan November 2014. Data dikumpulkanmelalui metode survei dan wawancara. Tujuan penelitian adalah menganalisis statusstok udang jerbung berdasarkan aspek biologi, potensi lestari, dan tingkatpemanfaatannya, serta menentukan opsi pengelolaanya. Analisis data menggunakan2 model kajian yaitu: 1 model analitik terdiri dari analisis panjang berat,pertumbuhan, dan mortalitas sumberdaya udang di perairan Bengkalis menggunakanprogram FISAT II; 2 model holistik terdiri dari analisis CPUE dan upayapenangkapan untuk mengetahui potensi lestari dan tingkat pemanfaatan sumberdayaudang jerbung saat ini. Pola pertumbuhan udang jerbung bersifat alometrik negatifartinya pertumbuhan panjang lebih cepat daripada pertumbuhan beratnya, sementarafaktor kondisi udang jerbung betina lebih luas daripada udang jerbung jantan; Ratarataukuran pertama kali tertangkap Lc lebih besar daripada rata-rata ukuranpertama kali matang gonad Lm yang menunjukkan tingkat pemanfaatan saat inimasih mendukung kelestarian sumberdaya udang; Laju pertumbuhan udang jerbungbetina lebih cepat daripada laju pertumbuhan udang jerbung jantan, dan puncakrekruitmen tertinggi terjadi pada periode bulan Maret-Mei dan September-Oktober.Potensi lestari MSY perikanan udang jerbung di Kabupaten Bengkalis sebanyak386,34 ton/tahun dengan upaya penangkapan optimum sebesar 567 unit trammel net.Tingkat Pemanfaaatan udang jerbung sudah melebihi upaya optimal yang seharusnyadiperbolehkan untuk ditangkap over exploited . Opsi pengelolaan udang jerbung diKabupaten Bengkalis yang dapat dilakukan yakni pembatasan upaya penangkapan,pengaturan ukuran mata jaring yang selektif, relokasi daerah penangkapan,penutupan daerah dan musim penangkapan. ...... Bengkalis Regency waters were one of intensified area with banana shrimp resourceutilization activities. The data showed that banana shrimp production was highly 540.38 ton than other shrimp species 317.7 ton in 2014. This research conductedin Bengkalis District begin from January until November 2014. Data collectedthrough a survey and interview methods. The research aimed to analyze status stockof banana shrimp based of biologist aspects, sustainable yield, utilization rate, anddetermining management option. Analysis of the research used two models that is 1 Analytical modeling consist of length weight analysis, growth, and mortality ofbanana shrimp in Bengkalis using FISAT II program 2 Holitic modeling consist ofCPUE analysis, fishing effort and the potential analysis for sustainable managementof banana shrimp resources. Allometric growth patterns banana shrimp was negativeif meant that the length growth faster than the growth of the weight, while the femalesbanana shrimp condition factor larger than males banana shrimp The average size ofthe first captured Lc were larger than the average size of the first ripe gonads Lm that indicates the current utilization rate still supports resource conservation ofbanana shrimp The growth rate of the female shrimp faster than the rate of growthof shrimp male, and the peak of the highest recruitment occurred in the period fromMarch to May and September to October. Sustainable potential MSY shrimpfishery in Bengkalis as much as 386.34 tons year with the optimum fishing effortamounted to 567 units of trammel net. The level of utilization of the banana shrimpalready exceeded the optimal effort that should be allowed to be captured. Shrimpmanagement options in Bengkalis to be done are the restriction fishing effort, ruleson mesh size selective, relocation of fishing ground, fishing ground closure and catchseason.

Abstrak :
Fenomena penurunan sumberdaya Rajungan di perairan Cirebon dan sekitarnya terjadi disebabkan peningkatan laju eksploitasi tanpa mempertimbangkan dinamika atau perubahan stok ikan dan aspek optimasi pemanfaatan. Penelitian ini bertujuan untuk mengkaji dinamika populasi rajungan, tingkat pemanfaatan, dan optimasi pemanfaatannya di perairan Cirebon dan sekitarnya. Penelitian dilaksanakan di Cirebon dan lokasi penelitian di perairan Cirebon dan sekitarnya dari bulan April ndash; Juni 2016. Metode yang digunakan adalah metode survey dengan pengukuran rajungan yang tertangkap oleh alat tangkap bubu dan jaring insang. Analisis dinamika populasi digunakan program FiSAT II dan pengkajian potensi lestari dianalisis dengan model surplus produksi dalam menentukan Maximum Sustainable Yield MSY. Sementara optimasi pemanfaatan dilakukan dengan analisis Linier Programing terhadap aspek-aspek yang terkait dengan pemanfaatan rajungan.Kisaran lebar karapas rajungan berkisar antara 77,5 ndash; 157,5 mm. Pola pertumbuhan bersifat allometrik negatif, dengan nilai Lc > Lm yang menunjukkan sebagian besar rajungan yang tertangkap dengan alat tangkap yang digunakan di perairan selatan Cirebon sudah memijah/dewasa. Nilai parameter pertumbuhan adalah L infin; 170 mm, K = 1,15 per bulan untuk rajungan jantan sedangkan rajungan betina L infin;177,25 mm, K = 1,1 per bulan, Z = 1,92 per tahun, M = 1,23 per tahun, F = 0,69 per tahun, dan E = 0,36 rajungan jantan dan Z = 2,94 per tahun, M =1,18 per tahun, F= 1,76 per tahun dan E = 0,60 pertahun rajungan betina. Nilai menunjukkan tingkat pemanfaatan sudah fully exploited. Pendugaan MSY dan F-Opt sebesar 3.124 ton/tahun dan 433 unit dengan alat tangkap standar bubu. Skenario optimasi menghasilkan jenis alat tangkap yang direkomendasikan yaitu 433 unit alat tangkap bubu dengan keuntungan Rp. 6,9 milyar per tahun.

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The phenomenon of Blue swimming crab decrease due to because of exploitation occurs in Cirebon water. It will change the dynamics stocks of fish and utilization optimization aspects. This study aimed to examine the dynamics of blue swimming crab populations utilization rates and utilization optimization in Cirebon area and the surrounding waters. Research was carried out in Cirebon and surrounding waters from April to June 2016. Methods used was a survey method by measuring Blue Swimming Crab caught using fishing gears gillnet and collapsible traps . Analysis of population dynamics used FiSAT II program and assessment of the potential sustainable surplus production models were analyzed using Maximum Sustainable Yield MSY . Optimization was done using Linear Programming analysis of aspects related to the use of fishing gears and blue swimming crab caught. Range carapace wide for all crabs was 77,5 mm to 157,5 mm. Condition Growth Blue Swimming Crab is negative allometric with parameter values for male were L infin 170 mm, K 1,15 per month and for female L infin 177,25 mm, K 1.1 per month, , with a value of Lc Lm, the indicate that Blue Swimming Crab caught with fishing gear used in Cirebon and surrounding waters was an spawn mature. Mortality value for male were Z 1,92 per year, M 1,23 per year, F 0,69 per year, and E 0,36 and for female Z 2,94 per year, M 1,18 per year, F 1,76 per year and E 0.60 per year. The level of utilization has been fully exploited. Estimation of MSY and f Opt was 3.124 tons year while 433 units with standard fishing gear is collapsible traps. Scenario optimization produces type of fishing gear that are recommended was 433 units of collapsible traps with a net profit Rp 6,9 billion per year.

Abstrak :
Kebijakan pengelolaan dan pemanfaatan sumberdaya ikan demersal yang berkelanjutan di Laut Cina Selatan harus didasari oleh hasil kajian stok sebagai bukti ilmiahnya. Penelitian ini bertujuan untuk menganalisis komposisi jenis, sebaran dan kepadatan stok ikan demersal serta keterkaitannya dengan aspek lingkungan. Hasil penelitian menunjukan ikan demersal yang tertangkap terdiri dari 62 Famili 180 jenis dan yang mendominasi adalah famili Nemipteridae dengan jenis ikan kurisi Nemipterus furcosus dan Nemipterus thosaporni. Struktur populasi ikan demersal yang tertangkap didominasi ikan muda dengan tingkat kematangan gonad yang belum matang immature. Perbandingan kelamin ikan demersal jantan dan betina didapatkan dalam keadaan seimbang dengan kecenderungan lebih banyak didapatkan ikan jantan. Penyebaran ikan demersal hampir merata pada berbagai kedalaman dan pada beberapa area dengan konsentrasi kepadatan yang cukup tinggi di kedalaman 40-60 m di sekitar kepulauan Anambas, Tambelan, Subi, dan Midai. Kepadatan stok ikan demersal didapatkan berkisar antara 68,9 kg/km2 sampai dengan 5.685,9 kg/km2 dengan rerata sebesar 1.070,86 kg/km2 dan biomassa sebesar 188.765,14 ton. Suhu, salinitas dan kedalaman perairan di LCS tidak berpengaruh signifikan terhadap kepadatan stok ikan demersal. ......The policy of a sustainable demersal resources management and utilization in South China Sea should be based on stock assesment results as its scientific evidence. The research aimed to analyze the species composition, distribution and demersal stock density, and its relation with environmental aspect. The research result showed that demersal fish caught consist of 62 family, 180 species and dominated by family of Nemipteridae as dominant species is Nemipterus furcosus and Nemipterus thosaporni. The structure of demersal population catched were dominated by younger fish with the gonad stage of maturity was immature. The ratio of male and female calculated in balance situation with male ratio higher. The distribution of demersal fish found at various depth and the height were found at depth range 40 60m around Anambas Island, Tambelan island, Subi island and Midai island. The stock density of demersal fish was estimated between 68,9 kg km2 to 5.685,9 kg km2 with average estimated about 1.070,86 kg km2 and the standing stock of demersal fish was estimated about 188.765,14 tons. The temperature, salinity and depth were not significantly influenced by the stock density.

Abstrak :
Ikan kakap merupakan ikan ekonomis penting yang menjadi sasaran penangkapan perikanan rawai dasar, gill-net dan trawl ikan di Laut Arafura. Eksploitasi sumber daya ikan kakap di perairan tersebut berlangsung bebas tanpa adanya aturan dan kontrol yang jelas. Keadaan tersebut juga akan berdampak kepada terancamnya kelestarian sumber daya ikan kakap dalam jangka panjang. Tujuan penelitian adalah menganalisis tentang komposisi jenis, laju tangkap, kepadatan stok, estimasi biomassa dan potensi penangkapan, serta hubungan antara beberapa faktor oseanografi terhadap sebaran kelimpahan ikan kakap. Penelitian dilaksanakan pada tanggal 20 Oktober sampai 20 November 2018 menggunakan Kapal Riset Bawal Putih 03 di Wilayah Pengelolaan Perikanan (WPP) 718 Laut Arafura. Analisis data menggunakan metode sapuan area (trawl). Hasil penelitian menunjukkan Ikan kakap yang ditemukan di Laut Arafura sebanyak 9 spesies dari 2 genera Lutjanidae. Komposisi jenis ikan kakap adalah spesies Lutjanus johni sebesar 52,3%, Lutjanus malabaricus 33,1%, Lutjanus vitta 8,7% dan paling rendah Lutjanus lutjanus 0,24%.  Laju tangkap ikan kakap bervariasi antara 0,2 kg/jam sampai dengan 340 kg/jam dan laju tangkap paling tinggi berada pada strata kedalaman 31-40 meter sebelah utara  kepulauan Aru dan selatan Timika. Rata-rata kepadatan stok ikan kakap di Laut Arafura sebesar 448,1 kg/km2. ......Snappers is an economically essential targeted fish for deep longline fisheries, gill-net and fish trawling in the Arafura Sea. The exploitation of Snapper resources in these waters happens without any clear rules and controls. This situation will also give impact and threat to its sustainability in the long term. The purpose of this study is to analyze the species composition, catch rate, stock density, biomass estimation, potential yield and the relationship between several oceanographic factors to the distribution of snapper abundance. The study was conducted from October 20 to November 20, 2018, using the Bawal Putih 03 Research Vessel in the Fisheries Management Area (WPP) 718 Arafura Sea. The data analyzed using the sweep area method and the results shown in the Arafura sea lives nine species from two genera Lutjanidae. The Species composition of snapper are Lutjanus johni species at 52.3%, Lutjanus malabaricus 33.1%, Lutjanus vitta 8.7% and the lowest Lutjanus lutjanus 0.24%. Snappers catch rates vary from 0.2 kg/hour to 340 kg/hour and the highest catch rates occur in-depth strata 31-40 meters in the north of the Aru Islands and the south of Timika. The average density of snapper stock in the Arafura Sea is 448.1 kg/km2.