1,720,956 research outputs found
Biometrik dan Kematangan Gonad Ikan Selar Kuning (Selaroides leptolepis Cuvier, 1833) Pada Perairan Muara Badak, Kalimantan Timur
Full text linkAbstrakAspek biologis ikan Selar kuning Selaroides leptolepis (Cuvier, 1833) pada Perairan Muara Badak, Kalimantan Timur belum pernah diinformasikan. Penelitian ini bertujuan untuk menganalisis aspek biometrik dan kematangan gonad ikan Selar kuning. Pengumpulan sampel ikan dilakukan setiap bulan dari September hingga Desember 2021. Total 530 individu ikan dikoleksi menggunakan metode acak sederhana dari hasil tangkapan nelayan yang ikannya didaratkan di pelabuhan nelayan Toko Lima, Muara Badak. Panjang tubuh ikan diukur menggunakan kaliper digital dan bobot tubuh ditimbang menggunakan neraca digital. Hasil penelitian ini diperoleh panjang tubuh ikan berkisar 91,39–145,44 mm dan bobot 7,60–37,60 g. Modus dominan panjang tubuh ikan didapatkan pada rentang kelas 121,39–127,38 mm. Rasio kelamin adalah 1 jantan: 1,03 betina, yang menunjukkan rasio jenis kelamin seimbang. Hubungan panjang dan bobot tubuh memiliki koefisien korelasi yang kuat (r= 0,953), dengan persamaan regresi W= 0,0000003L3,281. Pola pertumbuhan allometrik positif dan nilai faktor kondisi relatif rata-rata 1,04 ± 0,060, yang mencerminkan kondisi pertumbuhan ikan relatif baik. Persentase tertinggi ikan matang gonad didapatkan pada bulan November dan Desember 2021, yang mengindikasikan ikan siap memijah. Kajian ini meginformasikan hubungan panjang dan bobot tubuh, pola pertumbuhan, faktor kondisi, rasio jenis kelamin, dan tingkat kematangan gonad ikan Selar kuning dari Perairan Muara Badak yang dapat digunakan untuk penilaian kesehatan populasi dan strategi pengelolaannya.AbstractBiological aspects of the Yellow-stripe scad Selaroides leptolepis (Cuvier, 1833) from Muara Badak Waters, East Kalimantan have never been informed anywhere. This research aimed to inform biometrics aspects and gonadal maturity of the Yellow-stripe scad. The collection of fish samples was carried out every month from September to December 2021. A total of 530 individual fish were collected using a simple random method from the catches of fishers who landed their fish at the Toko Lima fishing port, Muara Badak. Its body length was measured using a digital caliper and the body weight was weighed using a digital balance. The results of this research showed that the fish’s body length ranged from 91.39–145.44 mm and body weight ranged from 7.60–37.60 g. A modus of fish body length was found in the range class of 121.39–127.38 mm. The sex ratio is 1 male:1.03 female, which indicates a balanced sex proportion. The length and bodyweight relationship has a strong correlation coefficient (r= 0.953), with the regression equation was W= 0.0000003L3.281. The positive allometric growth and the relative condition factor value were an average of 1.04 ± 0.060, reflecting the fish’s relatively good growth conditions.The highest percentage of gonadal maturity of fishes was found in November and December 2021, which indicated that the fishes were ready to spawn. This research provides information on the relationship between length and body weight, growth patterns, condition factors, sex ratio, and gonadal maturity level of the Yellow-stripe scad from Muara Badak waters which can be used for population health assessment and management strategies
Growth patterns, condition factors, and gonad maturity of the white-spotted spinefoot (Siganus canaliculatus, Park 1797) in the coastal area of Bontang City, East Kalimantan
Full text linkThis study aims to analyze growth patterns, condition factors, and gonad maturity of the white-spotted spinefoot (Siganus canaliculatus, Park 1797) in coastal waters of Bontang City, East Kalimantan. Fish samples were collected every month from February to June 2020. Fish were collected using a simple random method from the catches of fishers who landed their fish at the Tanjung Limau port, Bontang City. Fish body length was measured using a digital caliper, and body weight was measured using a digital balance. The results of this study obtained a total of 226 individual fish, consisting of 110 males and 116 females. Male fish have a length ranged from 94.78-197.88 mm and a weight ranged from 18.24-94.30 g, while female fish have a body length ranged from 90.00-201.09 mm and a body weight ranged from 17.98-95.16 g. The length-weight relationship shows a strong correlation (r2=0.967) with the regression equation W=5x10-5L2.721. The fish growth pattern is negative allometric. The average condition factor was 1.08±0.09, which reflected good growth. Gonadal mature of fish are found in May and June, indicating that the fish are ready to spawn.Keywords: condition factor; growth; Siganus canaliculatu
KEANEKARAGAMAN DAN KOMPOSISI IKAN PADA KONDISI PASANG DAN SURUT DI MUARA SUNGAI KELAY KABUPATEN BERAU KALIMANTAN TIMUR
No full textResearch on diversity and composition of fish at low tide and high tide condition in downstream Kelay River, District Berau, East Kalimantan is not yet know. The purpose of this research was to determine diversity and composition of fish that present at low tide and high tide condition in downstream Kelay River. In research using purposive sampling method and various sizes gill nets used. Results of this research shows that fish were collected at three locations sampling in downstream Kelay River consist of 14 species, 9 families, and 953 individuals. Based on the number of species, diversity Shannon-Wiener index and dominance index has stable of communities, with high value of diversity index (H'=1.975), high evenness index (E=0.749), and low value of dominance index (D= 0.173). The number of fish species found at low tide were 11 species and at high tide were 12 species. The similarity index of fish species at low tide and high tide condition were 64.3%
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
- …
