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DAERAH PENANGKAPAN DAN ASPEK BIOLOGI HIU DAN PARI YANG TERTANGKAP DI LAUT JAWA
Get PDFSumberdaya ikan hiu dan pari di Laut Jawa banyak tertangkap nelayan yang berasal dari Juwana sebagai ikan hasil tangkapan sampingan (HTS). Tingginya tekanan penangkapan ini berpotensi mengancam fungsi ekologinya di alam dan kelestariannya di masa yang akan datang. Tulisan ini bertujuan untuk mengetahui sebaran lokasi tertangkapnya sumberdaya ikan hiu dan pari, sekaligus mengetahui beberapa aspek biologi sumberdaya ikan hiu dan pari yang tertangkap di laut Jawa dan di daratkan di Juwana, Jawa tengah. Data yang diolah, diperoleh dari kegiatan enumerasi perikanan yang mencatat informasi pendaratan kapal, dan pengukuran data biologi beberapa spesies hiu dan pari yang didaratkan di Juwana selama periode September-November 2019. Hasil analisis menunjukkan bahwa cantrang adalah alat tangkap yang paling banyak menghasilkan HTS hiu dan pari. Armada kapal yang banyak digunakan berukuran antara 26-58 GT dengan lama trip penangkapan mencapai 28-58 hari. Lokasi fishing ground penangkapan hiu banyak tersebar di perairan sebelah selatan Kalimantan, dan lokasi fishing ground penangkapan pari tersebar relatif merata di selatan Kalimantan sampai dengan sekitar Pulau Bawean. Terdapat 6 spesies hiu yang sering tertangkap di Laut Jawa dengan spesies dominan adalah sphyrna lewini yang mencapai 44% dari total tangkapan hiu. Terdapat 7 spesies pari yang sering tertangkap dengan spesies dominan adalah Neotrygon orientalis yang mencapai 36% dari total tangkapan pari. Modus panjang total hiu sphyrna lewini adalah 71-80 cm dan modus lebar tubuh pari Neotrygon orientalis adalah 21-25 cm. Sebagian besar hiu dan pari yang banyak tertangkap sebagai HTS di Laut Jawa masuk kategori belum dewasa.Kata kunci: Hiu dan pari; komposisi jenis; aspek biologi; Laut Jawa; Juwan
KOMPOSISI HASIL TANGKAPAN DAN DAERAH PENANGKAPAN HIU BOTOL (Centrophoridae) YANG DIDARATKAN DI TENAU, NUSA TENGARA TIMUR
No full textHiu botol merupakan jenis ikan hiu yang bernilai ekonomis tinggi, karena dapat menghasilkan minyak ikan dari ekstrak hati dinamakan squalen. Pada umumnya, hiu botol hidup di perairan Samudera Hindia pada kedalaman lebih dari 100 meter, namun sampai saat ini penyebarannya belum banyak diketahui. Selain itu, informasi terkait komposisi jenisnya masih sangat terbatas. Tulisan ini bertujuan mengkaji komposisi hiu botol yang tertangkap rawai dasar dan daerah penangkapannya di perairan Samudera Hindia yang berbasis di Kupang, Nusa Tenggara Timur. Data diperoleh dari survei lapangan dan wawancara dengan nelayan penangkap hiu di daerah Tenau, periode bulan Januari-Desember 2016. Hasil kajian menunjukkan bahwa hiu botol yang menjadi target penangkapan terdiri atas tiga jenis yaitu; Centrophorus squamosus (10-13%), Centrophorus granulosus (15-20%), dan Centroscymnus coelolepis (sekitar 40%). Prosentase hiu botol yang di Samudera Hindia berkisar 0,01-0,04 % dari total tangkapan yang didaratkan di Pelabuhan Perikanan Pantai Tenau. Sedangkan, prosentase hiu botol periode tahun 2011-2014 relatif besar dibandingkan dengan hasil tangkapan jenis hiu lainnya. Namun, pada periode 2012-2014 hasil tangkapan hiu botol cukup fluktuatif dan cenderung menurun. Hal ini mengindikasikan bahwa populasi sumber daya jenis hiu ini telah terjadi penurunan. Hasil tangkapan hiu botol tertinggi terjadi pada bulan Januari-Februari dan Agustus-September, yang tertangkap di wilayah perairan Selatan Pulau Rote, Timor dan Sabu. Daerah penangkapan potensial hiu botol berada pada koordinat 1240-1280 BT dan 100-110 LS pada kedalaman antara 200-800 meter. A dogfish shark has a high economic value, especially its liver oil, namely squalen. In general, a dogfish sharks live in the waters of the Indian Ocean at a depth of over 100 meters, but its distribution and composition has not been well documented. This paper aims to describe the composition of sharks caught by bottom longlines operated in the Indian Ocean landed at Kupang, East Nusa Tenggara. Data obtained from field surveys and interviews with shark fishermen from Tenau in January-December 2016. The results showed that the dogfish shark consisted of three species: Centrophorus granulosus, Centrophorus squamosus and Centroscymnus coelolepis. The percentage of dogfish sharks in the Indian Ocean ranged from 0.01 to 0.04% of the total catch landed at Tenau. While the percentage of dogfish shark in period 2011 - 2014 was relatively large compared to the catch of other species of sharks. However, in period 2012 - 2014 dogfih shark catches fluctuated and tended to decrease. This indicates that the population decline of this species. The highest catches of dogfish shark occurred in January-February. During August-September sharks were caught in the territorial waters of the South Island of Rote, Timor and Sabu. Potentially fishing areas of dogfish shark would be located at 124o-128o E and 10o-11o S with depths between 200-800 meters.
EKSISTENSI PEREMPUAN PESISIR MARIND IMBUTI PADA REHABILITASI HUTAN MANGROVE DI PANTAI PAYUM KABUPATEN MERAUKE
Get PDFPelestarian hutan mangrove masih sering mengalami hambatan yaitu adanya keterbatasan waktu yang dimiliki oleh masyarakat pesisir khususnya kaum pria yang harus membagi waktu untuk bekerja mencari nafkah dan melakukan kegiatan pelestarian hutan mangrove. Melihat kondisi tersebut, ibu rumah tangga di wilayah pesisir mulai menunjukkan eksistensinya dalam mengaktualisasikan peran sosialnya dalam rangka pelestarian hutan mangrove. Tujuan dari penelitian ini adalah melihat eksistensi wanita pesisir dalam melakukan pelestarian hutan mangrove di pesisir Pantai Payum yang terletak di Kabupaten Merauke. Pengambilan sampel data penelitian menggunakan teknik purposive sampling. Data yang dikumpulkan dengan cara obeservasi langsung di lokasi kajian, wawancara mendalam (deep interview) dengan teknik analisis kualitatif dan Focus Group Discussion (FGD). Eksistensi wanita pesisir Marind Imbuti dalam pengelolaan willayah pesisir telah ditunjukkan pada tahap perencanaan yang secara aktif memberikan masukan dan saran dalam teknis pelaksanaan kegiatan rehabilitasi hutan mangrove Pantai Payum secara berkelanjutan. Dalam pelaksanaanya, peran wanita pesisir tidak terbatas pada penanaman bibit mangrove saja. Wanita pesisir juga berperan dalam menyiapkan konsumsi untuk keluarganya yang terlibat dalam rehabilitasi hutan mangrove. Pada tahapan evaluasi ini wanita Marind Imbuti juga memberikan penilaian terhadap apa yang mereka lihat dan rasakan pada pelaksanaan kegiatan penanaman hutan mangrove. Keterlibatan wanita pesisir Marind Imbuti dalam pengelolaan wilayah pesisir telah memperilihatkan eksistensinya pada tahap perencanaan, pelaksaan dan evaluasi kegiatan rehabilitasi hutan mangrove.The conservation of mangrove forests is still often hampered by the limited time owned by coastal communities, especially men who have to divide their time to work for a living and carry out mangrove forest conservation activities. Based on these conditions, homemakers in coastal areas began to show their existence in actualizing their social roles in the context of mangrove forest rehabilitation. This study examines the presence of coastal women in rehabilitating mangrove forests on the Coast of payum, Merauke Regency. A sampling of research data using the purposive sampling technique. Data were collected utilizing observation and in-depth interviews with qualitative analysis techniques. Marine Imbuti coastal women in the management of coastal areas have been shown at the planning stage to actively provide input and advice in the technical implementation of sustainable rehabilitation of the mangrove forest of pay Coast. In practice, the role of coastal women is not limited to planting mangrove seedlings. Coastal women also play a role in preparing food for their families involved in mangrove forest rehabilitation. At this evaluation stage, Marind Imbuti women also assessed what they saw and felt in implementing mangrove forest planting activities. Marine Imbuti's involvement in coastal area management has shown its existence in the planning, implementation and evaluation stages of mangrove forest rehabilitation activities
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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