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PERAN IKAN LIAR YANG BERASOSIASI DENGAN KERAMBA JARING APUNG DALAM MEREDUKSI BUANGAN NUTRIEN PAKAN
Get PDFPenelitian ini bertujuan untuk mengetahui peran ikan liar yang hidup di sekitar keramba jaring apung dalam meminimalisir buangan nutrien yang berasal dari kegiatan budidaya melalui pendekatan kecernaan ikan. Ikan sersan mayor Abudefduf vaigiensis dan capungan Sphaeramia orbicular yang dominan di keramba jaring apung ditangkap dan dipelihara selama dua bulan dan diberi pakan ikan kerapu komersial. Apparent Digestibility Coefficient (ADC) kemudian dihitung menggunakan metode tidak langsung dengan cara mencampurkan indikator khromium oksida (Cr2O3) ke dalam pakan. ADC ikan sersan mayor untuk N, P dan bahan kering berturut-turut sebesar 12,88%; 15,47%; dan 66,67%. Selanjutnya jumlah N dan P yang tersimpan dalam karkas ikan sebesar 19,90% dan 12,76%. Ikan sersan mayor dengan FCR 3,0 melepaskan N dan P ke perairan sebanyak 104,78 dan 42,66 gram setiap penambahan 1 kg bobot badan. Ikan capungan, dengan ADC terhadap N, P dan bahan kering pakan sebesar 12,52%; 59,07%; dan 62,15% menahan 16,76% N dan 11,71% P dalam karkasnya. Dengan FCR 5,0, ikan capungan mengeksresikan N sebanyak 181,46 gram dan 71,96 gram P ke perairan ketika terjadi peningkatan biomassa 1 kg. Ikan liar yang hidup di sekitar keramba jaring apung di Teluk Awerange dapat meminimalisir buangan limbah dari keramba jaring apung sebesar 10% – 20%. The study was aimed to point out the role of wild fishes associated with floating net cage in minimizing nutrient loading from fish farming through digestibility approach. Abudefduf vaigiensis and Sphaeramia orbicular as the dominant species around sea cage were caught and fed ad satiation with commercial grouper food for 2 months period. Apparent Digestibility Coefficient (ADC) was then calculated using indirect method by mixing indicator chromium oxide (Cr2O3) with fish food. ADC of A. vaigiensis for nitrogen (N), phosphate (P) and dry matter were 12.88%, 51.47%, and 66.67 % respectively. Moreover, N and P retained from fish carcass were 19.90% and 12.76%. Furthermore, these fishes with FCR of 3.0 release N and P to sea water as much as 104.78 gram and 42.66 g respectively when biomass increase to 1 kg. For Sphaeramia orbicularis, ADC for N, P and dry matter were 12.52%, 59.07%, and 62.15% respectively and retained 16.76% N and 11.71% P in their carcass. Moreover, with FCR of 5.0, these fishes excreted 181.46 gram of N and 71.96 gram of P into the environment when the biomass increases to 1 kg. Wild fishes associated with sea cage in Awarange bay have the potential of minimize released nutrient between 10%–20%
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
KONSENTRASI NUTRIEN DAN PADATAN TERSUSPENSI LIMBAH TAMBAK SUPERINTENSIF UDANG VANAME (Litopenaeus vannamei) DALAM MEDIA BIOFILTER TIRAM Crassostrea sp DAN RUMPUT LAUT Gracillaria verrucosa
No full textPenelitian mengenai aplikasi rumput laut (G. verrucosa) dan tiram (C. cucculata) sebagai biofilter dalam pengolahan limbah tambak udang vaname super intensif telah dilakukan. Penelitian ini bertujuan untuk menganalisis efektifitas rumput laut (G. verrucosa) dan tiram (C. cucculata) dalam mereduksi konsentrasi nutrient dan padatan tersuspensi limbah tambak udang vaname super intensif. Penelitian ini dilakukan dalam skala laboratorium dimana konsentrasi nutrient dan partikel tersuspensi limbah dianalisis berdasarkan dua faktor yakni biofilter dan waktu pemaparan limbah dalam media biofilter. Regenerasi nutrient dan ekskresi oleh tiram serta rendahnya biomassa rumput laut (G. verrucosa) menyebabkan kedua jenis biofilter yang digunakan dalam penelitian ini belum memberikan kontribusi yang nyata terhadap penurunan konsentrasi nutrient dan partikel tersuspensi limbah. Sebaliknya, tiram menyebabkan tingginya konsentrasi TAN dalam limbah. Waktu pemaparan limbah dalam wadah biofilter memberikan pengaruh yang nyata terhadap konsentrasi nutrient dan partikel tersuspensi; namun demikian konsentrasi nutrient dan partikel tersuspensi selama pemaparan limbah dalam wadah biofilter tidak berkurang. Oleh karena itu, penelitian lebih lanjut mengenai biomassa rumput laut (G. verrucosa) dan tiram (C. cucculata) yang optimum serta lama waktu pemaparan limbah perlu dilakukan sehingga effektifitas kedua jenis biofilter dalam mereduksi konsentrasi nutrient dan partikel tersuspensi dapat ditingkatkan
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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