scholarly journals Identifying blue swimming crab (Portunus pelagicus) stocks with truss network analysis approach in Indonesian Fisheries Management Area 712

2020 ◽  
Vol 10 (3) ◽  
pp. 390-401
Author(s):  
Nurhaya Afifah ◽  
Zairion Zairion ◽  
Hawis H Maduppa ◽  
Agus A Hakim ◽  
Yusli Wardiatno
Keyword(s):  
Network Analysis ◽  
Fisheries Management ◽  
Sustainable Management ◽  
Euclidean Distance ◽  
The Other ◽  
Optimum Level ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Morphometric Characters ◽  
Management Area

Exploitation rate of the blue swimming crab (BSC) in Indonesian Fisheries Management Area (FMA) 712 is over-optimum level in 2016. Stocks concern in sustainable management is needed as an effort to maintain its availability. The objective of this study is to identify the stock unit of BSC based on Truss Network Analysis (TNA) of morphometric characters in FMA 712. The BSC was collect in five different locations, i.e. East Lampung, Lancang Island, Cirebon, Rembang, and Southern Madura. Measurements on TNA were carried out at 14 landmark points with 29 characters in carapace to analyze its morphometric characters. The cluster analysis showed that TNA method revealed two stocks units of BSC in FMA 712. The first stock was the BSC population of Southern Madura, and the other stock was the other four population. The longest Euclidean distance was found at Southern Madura indicating similarity level with other populations was low. The discriminant analysis demonstrated the different result. There were three group populations, which every population in one group were able to represent the other population, namely Lancang Island-Cirebon, East Lampung-Rembang, and Southern Madura. Regarding to this study, it is recommended to manage BSC in Southern Madura separately.

scholarly journals Sustainable Management of Blue Swimming Crab (Portunus pelagicus) Based of Bioecology Aspects In Lasongko Bay, Southeast Sulawesi

2017 ◽  
Vol 9 (1) ◽  
pp. 41 ◽  
Author(s):  
Abdul Hamid Lakudo ◽  
Yusli Wardiatno Wardiatno ◽  
Djamar T.F Lumban Batu ◽  
Etty Riani Riani
Keyword(s):  
Strategic Management ◽  
Sustainable Management ◽  
Ovigerous Female ◽  
Management Strategies ◽  
Research Result ◽  
Fishing Ground ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Sustainability Management ◽  
The Status

Status perikanan rajungan di Teluk Lasongko saat ini telah overfishing dan kritis, sehingga perlu dikelola dengan baik. Makalah ini bertujuan untuk menentukan potensi dan permasalahan keberlanjutan pemanfaatan rajungan serta menyusun strategi pengelolaan rajungan di Teluk Lasongko berdasarkan pada aspek bioekologi. Data ekobiologi dikumpulkan sejak tahun 2006, dan 2013 sampai 2014 di Teluk Lasongko. Hasil penelitian menunjukkan potensi dan keberlanjutan pemanfaatan perikanan rajungan di Teluk Lasongko tergolong tinggi. Permasalahan yang timbul yang mengancam keberlanjutan rajungan adalah overfishing, penangkapan rajungan berukuran kecil dan rajungan betina ovigerous, daerah penangkapan rajungan yang tidak merata, dan kegiatan perikanan yang tidak ramah lingkungan. Beberapa strategi pengelolaan harus dilakukan untuk mendukung dan memastikan pengelolaan berkelanjutan rajungan di Teluk Lasongko, yaitu penetapan ukuran terkecil yang boleh ditangkap (untuk jantan >109,8 mm-CW dan betina >115,7 mm-CW), pelarangan penangkapan rajungan betina ovigerous, dan mengurangi upaya penangkapan dengan bubu sampai 50%. Selain itu, restocking dan pembentukan suaka rajungan juga harus dilakukan.  The status of blue swimming crab (Portunus pelagicus) fishery in Lasongko Bay is detected overfishing and critical, so it needs to be managed properly. This paper was aimed to determine the potential and problems of sustainability use of the crab and establish strategic management based on bioecology aspects. Bioecological data on the crab were collected in 2006, and from 2013 to 2014 in Lasongko Bay. Research result of indicated high potential and sustainable of use of crab fishery in the bay. Arising problems to threat the sustainability were over-fishing, small size crab and ovigerous female catch, localized fishing ground, and unfriendly environmentally fishing activities. Some management strategies must be done to support and ensure the sustainability management of the crab in Lasongko Bay, i.e. the minimum legal size (for males >109.8 mm-CW and females >115.7 mm-CW), not catching ovigerous female crabs, and reducing use of traps up to 50%. Restocking and establishing crab sanctuary could be also important to enhance the aforesaid management strategies.

scholarly journals PARAMETER POPULASI DAN TINGKAT PENGUSAHAAN RAJUNGAN (Portunus pelagicus) DI PERAIRAN ASAHAN, SELAT MALAKA

2017 ◽  
Vol 9 (2) ◽  
pp. 93
Author(s):  
Andina Ramadhani Putri Pane ◽  
Heri Widiyastuti ◽  
Ali Suman
Keyword(s):  
Mortality Rate ◽  
Carapace Width ◽  
Total Mortality ◽  
Optimum Level ◽  
Market Demand ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Monthly Data ◽  
Management Measures ◽  
Exploitation Rate

Tingginya permintaan pasar terhadap rajungan mengakibatkan aktivitas penangkapannya berlangsung secara intensif. Selat Malaka merupakan salah satu daerah penangkapan rajungan yang penting di Indonesia. Tujuan penelitian ini adalah untuk mengestimasi parameter populasi dan tingkat eksploitasi rajungan (Portunus pelagicus) di perairan Asahan dan sekitarnya. Pengumpulan data bulanan dilakukan pada bulan Juni 2015 sampai dengan Nopember 2016. Hasil penelitian menunjukkan bahwa musim penangkapan berlangsung sepanjang tahun dengan puncak pada bulan Juli dan Oktober, puncak pemijahan terjadi pada bulan Januari dan Agustus. Ukuran lebar karapas pertama kali tertangkap dengan gillnet (Lc) dan ukuran pertama kali matang gonad (Lm) masing-masing sebesar 109,6 mm dan 104,1 mm. Laju pertumbuhan (K) sebesar 1,38/tahun dan lebar karapas asimtotik (L) sebesar 183,10 mm. Laju kematian total (Z) rajungan sebagai 4,31 per tahun, laju kematian karena penangkapan (F) dan laju kematian alami (M) masing-masing 2,96 per tahun dan 1,35 per tahun; laju eksploitasi (E) diestimasi sebesar 0,69. Tingkat pemanfaatan rajungan di perairan Asahan diduga telah melewati optimal, sehingga perlu dilakukan pengelolaan melalui pengurangan jumlah unit gillnet rajungan sebanyak 38% dari kondisi saat ini. Blue swimming crab faced intensive fishing pressure due to the high market demand. The Malacca Strait is one of important fishing area for blue swimming crab. The research aims to estimate the population parameters and exploitation rate of blue swimming crab (Portunus pelagicus) in the Asahan and adjacent waters. A monthly data were collected from June 2015 to November 2016 that caught by Gillnet. The results showed that the fishing season takes place throughout the year with peaks in July and October, meanwhile peak of spawning season in January and August. The carapace width at first capture (Lc) and first mature (Lm) were 109.6 mm and 104.1 mm, respectively. The growth rate (K) was 1.38 / year and the asymptotic length (L) was 183.10 mm. Total mortality rate (Z) was 4.31 per year, fishing mortality rate (F) and natural mortality rate (M) were 2.96 per year and 1.35 per year respectively; Exploitation rate (E) was estimated at 0.69. It means that the exploitation rate of swimming crab in the Asahan waters found exceed the optimum level, therefore the management measures needs to reduce effort (unit) of gillnet by a 38% of actual level. 

scholarly journals STATUS PENGELOLAAN PERIKANAN RAJUNGAN (Portunus Pelagicus) DENGAN PENDEKATAN EKOSISTEM DI LAUT JAWA (WPPNRI 712)

2015 ◽  
Vol 7 (1) ◽  
pp. 9
Author(s):  
Aris Budiarto ◽  
Lucky Adrianto ◽  
Mukhlis Kamal
Keyword(s):  
Fisheries Management ◽  
Fishery Management ◽  
Ecosystem Approach ◽  
Portunus Pelagicus ◽  
Fisheries Resources ◽  
Management Area ◽  
Density Values ◽  
Java Sea ◽  
Research Domain ◽  
Economic Domain

<p>Laut Jawa (WPPNRI 712) memiliki karakteristik permasalahan dalam pengelolaan perikanan rajungan yaitu berkurangnya stok sumberdaya rajungan dan tinggi nya jumlah armada penangkapan. Penelitian ini bertujuan untuk mengetahui kondisi pengelolaan perikanan rajungan di perairan Laut Jawa berdasarkan pada indikator pengelolaan perikanan dengan pendekatan ekosistem (Ecosystem Approach to Fisheries Management-EAFM). Enam domain indikator EAFM yang digunakan sebagai dasar untuk analisis adalah (1) Sumber Daya Ikan; (2) Habitat dan Ekosistem; (3) Teknik Penangkapan; (4) Sosial; (5) Ekonomi; dan (6) Kelembagaan. Hasil penelitian menunjukkan bahwa nilai skor komposit EAFM tergolong kategori sedang dengan kisaran antara 1,5 – 2,5. Hasil penilaian aggregat seluruh domain diperoleh nilai skor densitas berkisar antara 6,3 – 55,9. Domain memiliki densitas tertinggi adalah domain sosial dan domain kelembagaan sebesar 54,7 dan 55,9 dengan kategori sedang. Domain habitat/ekosistem dan domain ekonomi memiliki nilai skor 36,5 dan 20,7 dengan kategori kurang. Domain sumberdaya ikan dan domain teknik penangkapan memiliki nilai skor 6,3 dan 16,3 dengan kategori buruk. Secara keseluruhan hasil penilaian indikator EAFM menunjukkan bahwa pengelolaan rajungan di WPPNRI 712 dalam kategori buruk hingga sedang. Rekomendasi dari penelitian ini adalah melaksanakan perbaikan pengelolaan perikanan rajungan secara bertahap dengan melakukan 5 (lima) langkah pengelolaan yaitu; pengaturan rajungan yang boleh ditangkap, pengaturan musim penangkapan, pengendalian alat tangkap dan daerah penangkapan, perlindungan dan rehabilitasi habitat serta melaksanakan restoking.</p><p> </p><p>Java Sea waters (Fisheries Management Area 712) is one of the main live crab habitat which is also the main blue swimming crab (BSC) production centers in Indonesia. FMA 712 has the characteristics of BSC fishery management problems is lower stock of crabs and the high number of fishing fleet. This study was aims to determine the condition of BSC fishery management in Java Sea waters, which developed based on performance indicators of ecosystem approach (EAFM). The six EAFM indicators used as the basis for analysis (1) Fisheries Resources; (2) Habitat and Ecosystem; (3) Fishing Technology; (4) Social; (5) Economic; and (6) Institutional. The results of each research domain indicates that the value of the composite score EAFM classified as category medium in the range of 1.5-2.5. The entire aggregate assessment results obtained domain scores density values ranging between 6.3 - 55.9. Domain which has high density is the domain of social and institutional domains of 54.7 and 55.9 in the medium category. Domain habitat /ecosystem and the economic domain has a score of 36.5 and 20.7 with less category. For domain domain fish resources and fishing techniques have a score of 6.3 and 16.3 with the bad category. The overall of EAFM indicators ranged between 6.3 - 55.9 Indicating that the management of BSC in FMA 712 under poor to moderate category. Recommendations of this study is to carry out repairs BSC fishery management gradually to perform five steps management; minimum legal size for capture, open closed fishing season, control gear and fishing areas, protection and rehabilitation of habitat and implement restoking.<br /><br /></p>

scholarly journals KEBERLANJUTAN PERIKANAN RAJUNGAN INDONESIA: PENDEKATAN MODEL BIOEKONOMI

2018 ◽  
Vol 9 (2) ◽  
pp. 71
Author(s):  
Umi Muawanah ◽  
Hakim Miftahul HUda ◽  
Sonny Koeshenderajana ◽  
Duto Nugroho ◽  
Zuzy Anna ◽  
...  
Keyword(s):  
Open Access ◽  
Fisheries Management ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Catch Data ◽  
Resource Sustainability ◽  
Maximum Economic Yield

Perikanan Rajungan (Portunus pelagicus) di Indonesia memberikan devisa sebesar US$ 246,14 juta dari ekspor pada tahun 2015 dan menghidupi 65.000 nelayan dan 130.000 pengupas rajungan di Indonesia. Berdasar nilai strategisnya ini, pemanfaatan perikanan rajungan perlu memperhatikan asas keberlanjutan sumber daya. Penelitian ini bertujuan menganalisa keberlanjutan pemanfaatan sumberdaya rajungan di Indonesia menggunakan model bioeokomi dari data hasil tangkapan rajungan di Wilayah Pengelolaan Perikanan (WPP) RI tahun 1977-2014. Hasil penelitian menunjukkan bahwa pemanfaatan sumberdaya rajungan di Indonesia memberikan rente ekonomi yang tinggi pada kondisi Maksimum Sustainale Yield (MSY) dan Maksimum Economic Yield (MEY) sedangkan pada rezim open access (OA) tidak memberikan rente ekonomi. Mengacu pada hasil penelitian maka pengaturan pemanfaatan sumberdaya rajungan dengan upaya dan produksi yang mendekati batas MEY diharapkan dapat menjamin keberlanjutan usaha rajungan baik secara biologi maupun ekonomi. Adapun pemanfaatan secara open access (OA) hendaknya dibatasi atau dihindari karena kondisi ini tidak dapat menjamin berkelanjutan perikanan rajungan baik secara biologi maupun ekonomi.The Blue Swimming Crab (BSC, Portunus pelagicus) fishery  in Indonesia provides revenue of US$ 246.14 million rom exports in 2015 and supports 65,000 fishermen and 130,000 pickers in Indonesia. Based on this value, the harvest of BSC fishery should consider the principle of resource sustainability. This study aims to analyze the sustainability of utilization of crab resources in Indonesia using bioeocomic model applied to the BSC catch data from all Fisheries Management Areas (FMA) in Indonesia from year 1977 until 2014. The results show that BSC harvest in Indonesia gives high economic rents under the conditions of Maximum Sustainale Yield (MSY) and Maximum Economic Yield (MEY) while the open access regime does not provide any economic rents. Referring to the results of the study, the arrangement of utilization of crab resources with efforts and production close to the limit of MEY is to be expected to ensure the continuity of the crab business both biologically and economically. The direction toward open access should be limited or avoided because this condition will lead to the unsustainable practices of the BSC fishery both biologically or economically. 

scholarly journals Genetic population subdivision of the blue swimming crab (Portunus pelagicus) across Indonesia inferred from mitochondrial DNA: Implication to sustainable fishery

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0240951
Author(s):  
Hawis Madduppa ◽  
Rina Martaulina ◽  
Zairion Zairion ◽  
Resha Mukti Renjani ◽  
Mujizat Kawaroe ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
Fisheries Management ◽  
Global Market ◽  
Genetic Connectivity ◽  
Market Demand ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Spatial Connectivity ◽  
Sustainable Fishery

The blue swimming crab (BSC), Portunus pelagicus (Linnaeus 1758), inhabits coastal areas of Southeast and East Asia, and is one of high fisheries commodities with an export value for Indonesia and an increasing global market demand, annually. However, the data of genetic diversity and their spatial connectivity of populations in Indonesia are not yet known, even when it is important to inform stock unit management and sustainable use. This study aimed to determine the genetic diversity and differentiation of blue swimming crabs across Indonesian populations in different Fishery Management Area (FMA), and their spatial genetic connectivity, as well as to deliver implications for sustainable fishery. A total of 297 individuals were collected and amplified using cytochrome oxidase I mitochondrial DNA. This study has showed the highest values for haplotype and nucleotide diversity in the eastern part of Indonesia, where exploitation is relatively low. Significant genetic differentiation between populations (FST = 0.954; p < 0.001) and the fisheries management areas (FST = 0.964; p < 0.001) were revealed. Low spatial connectivity was observed between populations in a distance of at least more than 60 kilometers. This study suggests that BSC populations in Indonesia, likely have several stock units, and preferably different fisheries management plans and actions across the region thoroughly and simultaneously. This would be effective for management and their sustainable conservation.

La gestion forestière écosystémique multifonctionnelle et son importance pour la biodiversité (essai) | Multifunctional forest ecosystem management and its importance for biodiversity (essay)

2010 ◽  
Vol 161 (8) ◽  
pp. 311-315
Author(s):  
Jean-Philippe Schütz ◽  
Brice de Turckheim
Keyword(s):  
Ecosystem Management ◽  
Basic Principle ◽  
Forest Ecosystem ◽  
Sustainable Management ◽  
Management System ◽  
The Other ◽  
Carbon Management ◽  
Gestion Forestière ◽  
Forest Ecosystem Management

The basic principle of Pro Silva silviculture is to be multifunctional and to seek to combine into a harmonious whole all the benefits provided by the forest. It is thus a management system constantly adapted to follow the evolution of different needs and requirements. On the occasion of the International Year of Biodiversity, it is here explained why this form of management meets in an optimal manner the interests of biodiversity without however pushing into the background the other functions, in particular carbon management. Intrinsically it corresponds to the principles of sustainable management, maintaining the balance between economic, social and ecological interests.

Keeping the Vision Alive: The Role of Networks in National Memorial Building A Case Study of the Vietnam Women’s Memorial and the Black Revolutionary War Patriots Memorial

Public Voices ◽  
2016 ◽  
Vol 11 (1) ◽  
pp. 89
Author(s):  
Amy Probsdorfer Kelley ◽  
John C. Morris
Keyword(s):  
Network Analysis ◽  
Revolutionary War ◽  
The Other ◽  
Perceived Popularity ◽  
National Mall ◽  
Compare And Contrast

The process to win approval to build a national memorial on the National Mall inWashington, DC is both long and complex. Many memorials are proposed, but few are chosen to inhabit the increasingly scarce space available on the Mall. Through the use of network analysis we compare and contrast two memorial proposals, with an eye toward understanding why one proposal was successful while the other seems to have failed. We conclude that the success of a specific memorial has less to do with the perceived popularity of the person or event to be memorialized, and more to do with how the sponsors use the network of people and resources available to advocate for a given proposal.

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