scholarly journals PEMETAAN POLA PERGERAKAN PENANGKAPAN IKAN CAKALANG (Katsuwonus pelamis) DENGAN MENGGUNAKAN DATA SATELIT DAN PURSE SEINE DI SELAT MAKASSAR SELAMA JULI-OKTOBER 2018

2019 ◽  
Vol 6 (12) ◽  
Author(s):  
Ahmad Rezha Oktari ◽  
Muhammad Ridwan ◽  
Mukti Zainuddin ◽  
Musbir Musbir
Keyword(s):  
Additive Model ◽  
Purse Seine ◽  
Data Sampling ◽  
Katsuwonus Pelamis ◽  
General Additive Model

Tujuan penelitian ini adalah untuk mengkaji dan memetakan pola pergerakan ikan Cakalang (Katsuwonus Pelamis) pada bulan Juli – Oktober 2018   dengan fishing base di Kabupaten Pinrang di Selat Makassar. Data yang digunakan yaitu data primer yang dikumpulkan dengan mengikuti operasi penangkapan purse seine dan dikombinasikan dengan data sekunder yaitu citra satelit suhu permukaan laut dan klorofil-a yang diperoleh dari satelit Aqua modis sesuai dengan waktu penelitian. Metode yang digunakan dalam penelitian ini adalah metode survey dimana data sampling dianalisis dengan menggunakan analisis statistic General Additive Model (GAM) yang menganalisis hasil tangkapan dan beberapa parameter oseanografi. Dari hasil tersebut kemudian dilakukan analisis dengan tehnik spasial analisis pada sistem informasi geografis (SIG) menggunakan perangkat lunak ArcGis 10.2 sehingga didapatkan pola pergerakan ikan cakalang di Perairan Selat Makassar. Hasil penelitian menunjukkan pola pergerakan ikan cakalang pada bulan Juli sampai Oktober secara signifikan dipengaruhi oleh konsentrasi Klorofil-a. Pola pergerakan ikan cakalang di Perairan Selat Makassar yaitu pada bulan Juli – Agustus 2018 berada di Perairan Pare pare – Barru, Sulawesi selatan dan bulan September gerombolan ikan bergerak ke arah barat lepas pantai. Selanjutnya pada bulan Oktober konsentrasi ikan cenderung bergerak terus ke arah barat mendekati perairan pantai Kotabaru, Kalimantan Selatan. Diduga kuat pola pergerakan ikan cakalang terkait dengan pola distribusi makanan ikan / nutrient yang diindikasikan oleh kondisi klorofil-a.

scholarly journals Quantifying the increase in fishing efficiency due to the use of drifting FADs equipped with echosounders in tropical tuna purse seine fisheries

2020 ◽  
Author(s):  
Gwenaëlle Wain ◽  
Loreleï Guéry ◽  
David Michael Kaplan ◽  
Daniel Gaertner
Keyword(s):  
New Technology ◽  
Recent Change ◽  
Purse Seine ◽  
Catch Per Unit Effort ◽  
Katsuwonus Pelamis ◽  
Thunnus Obesus ◽  
Efficiency Increase ◽  
Tropical Tuna ◽  
Floating Objects ◽  
The Impact

Abstract Numerous pelagic species are known to associate with floating objects (FOBs), including tropical tunas. Purse seiners use this behaviour to facilitate the capture of tropical tunas by deploying artificial drifting fish aggregating devices (dFADs). One major recent change has been the integration of echosounders in satellite-tracked GPS buoys attached to FOBs, allowing fishers to remotely estimate fishable biomass. Understanding the effects of this new technology on catch of the three main tuna species (yellowfin tuna, Thunnus albacares; bigeye tuna, Thunnus obesus; and skipjack tuna, Katsuwonus pelamis) is important to accurately correct for this change in catch-per-unit-effort (CPUE) indices used for stock assessments. We analysed catch data from the French purse seine fleet for the period 2010–2017 in the Indian Ocean to assess the impact of this fleet’s switch to echosounder buoys around 2012. Results indicate that echosounders do not increase the probability a set will be succesful, but they have a positive effect on catch per set, with catches on average increasing by ≈2−2.5 tonnes per set (≈10%) when made on the vessel's own dFADs equipped with an echosounder buoy. Increases were due to a decrease in sets below ≈25 tonnes and an increase in those greater than ≈25 tonnes, with a non-linear transition around this threshold. This increase explains the considerable investment of purse seiners in echosounder buoys, but also raises concerns about bias in stock size estimates based on CPUE if we do not correct for this fishing efficiency increase.

scholarly journals Aspek Biologi Cakalang (Katsuwonus pelamis, Linnaeus 1758) di Sulawesi Tenggara

2019 ◽  
Vol 13 (2) ◽  
pp. 139-147
Author(s):  
Tyas Dwi Bekti Diningrum ◽  
Heri Triyono ◽  
Meuthia Aula Jabbar
Keyword(s):  
Sex Ratio ◽  
Random Sampling ◽  
Simple Random Sampling ◽  
Purse Seine ◽  
Katsuwonus Pelamis

Penelitian dilakukan bulan Maret hingga Mei 2019 di Perairan Sulawesi Tenggara. Penelitian ini bertujuan untuk mengetahui aspek biologi ikan cakalang yang meliputi hubungan panjang-bobot, sex ratio, Tingkat Kematangan Gonad (TKG), Lc, Lm serta mengetahui daerah penangkapan dan musim penangkapan ikan cakalang. Metode yang digunakan adalah accidental sampling untuk penentuan responden yang diwawancarai, metode simple random sampling untuk menentukan ikan contoh. Perhitungan Lc menggunakan Hasil penelitian menunjukkan bahwa hubungan panjang berat ikan cakalang jantan besifat isometrik dengan persamaan W= 0,0189L3, sedangkan pola pertumbuhan cakalang betina bersifat alometrik negatif dengan persamaan W = 2,83L1,69. Nisbah kelamin didominasi oleh Jantan dengan perbandingan 1 : 0,4. Tingkat Kematangan Gonad didominasi oleh ikan immature (TKG I dan II). Didapatkan Lm = 47,73 cm (34,10 – 66,78). Lc < Lm pada alat tangkap purse seine dan Lc > Lm pada alat tangkap pancing tonda dan huhate. Cakalang paling banyak tertangkap di Laut Banda pada musim barat (September-Februari) dan di Teluk Bone saat musim timur (Maret-Agustus). Sumberdaya perikanan cakalang diindikasi mengalami overfishing dilihat dari banyaknya ikan immature yang tertangkap dan nilai Lc (purse seine) yang lebih kecil dari pada Lm nya. Penulis merekomendasikan agar nelayan beralih alat tangkap dari purse seine ke pancing tonda atau huhate.

scholarly journals Efektivitas penggunaan rumpon sebagai daerah penangkapan ikan di Perairan Pusong Kota Lhokseumawe

DEPIK ◽  
2018 ◽  
Vol 7 (2) ◽  
pp. 119-126
Author(s):  
Makwiyah A. Chaliluddin ◽  
Ratna M. Aprilla ◽  
Junaidi M. Affan ◽  
Abdullah A. Muhammadar ◽  
Heri Rahmadani ◽  
...  
Keyword(s):  
Purse Seine ◽  
Fishing Ground ◽  
Survey Method ◽  
Skipjack Tuna ◽  
Tuna Fish ◽  
Katsuwonus Pelamis ◽  
Direct Sampling ◽  
Euthynnus Affinis ◽  
Fish Aggregating Devices

The existence of fish aggregating devices (FADs) in a waters is able to establish a new fishing ground that potential waters. FADs are able to attract the attention of the gathering of fishes and other aquayic organisms around it, increasing the density of fish around FADs can increase the chances of successful catching operation, and therefore the FADs has benefited significantly to increase the capture fishery production significantly. The purposes of the research were to evaluate the catching composition of purse seine production  using FADs and non FADs, and to examine the fectiveness of FADs. This research was conducted on February 1 - 28, 2018 located at Pusong Waters, Lhokseumawe City. The survey  method was used in this study. The direct sampling by following the fisherman in fishing activities was performed both the purse seine with FADs and no FADs. Total purse seine catches during the research were 4,320 kg consisting of Long Jawed Mackerel (Rastrelliger sp.) 1,280 kg (29.63%), Decapterus Fish ( Decapterus sp.) 350 kg (8,107%), skipjack tuna (Katsuwonus pelamis) 845 kg (19.56 %), tuna fish (Euthynnus affinis) 720 kg (16.67%), Torpedo scad (Megalaspis cordyla) 300 kg (6.94%), Queenfish 140 kg (3.24%), and starry triggerfish (Abalistes stellaris) 685 kg (15.86%). It was concluded that the purse seine used FADs is more effective  compared to the a purse seine that does not use FADs.Keberadaan rumpon di suatu perairan mampu menarik perhatian berkumpulnya ikan dan organisme lain disekitarnya, sehingga dapat meningkatkan hasil tangkapan ikan. Penelitian ini bertujuan untuk menganalisis komposisi hasil tangkapan purse seine yang menggunakan rumpon dan purse seine yang tidak menggunakan rumpon, dan menilai efektivitas rumpon dalam mengumpulkan ikan. Penelitian ini dilaksanakan pada 01 - 28 Februari 2018 bertempat di Perairan Pusong, Kota Lhokseumawe. Metode penelitian yang digunakan adalah metode survei, yaitu dengan mengikuti nelayan dalam kegiatan penangkapan ikan, baik nelayan purse seine yang menggunakan rumpon dan nelayan purse seine yang tidak menggunakan rumpon. Data ikan hasil tangkapan yang diperoleh dihitung jumlah ikan hasil tangkapan dan diidentifikasi spesies ikan dan selanjutnya dibandingkan dengan hasil tangkapan nelayan yang menggunakan rumpon dan ikan hasil tangkapan nelayan yang tidak menggunakan rumpon. Total hasil tangkapan purse seine selama penelitian sebanyak 4.320 kg terdiri dari kembung (Rastrelliger sp.) 1.280 kg (29,63%), layang (Decapterus sp.) 350 kg (8,107%), cakalang (Katsuwonus pelamis) 845 kg (19,56%), tongkol (Euthynnus affinis) 720 kg (16,67 %), tegang ekor/tetengkek (Megalaspis cordyla) 300 kg (6,94 %), talang/daun bamboo (Scomberoides lysan) 140 kg (3,24%), dan ayam-ayam (Abalistes stellaris) 685 kg (15,86 %).  Dari kedua jenis kegiatan penangkapan ikan tersebut, maka purse seine menggunakan rumpon lebih efektif dibandingkan purse seine yang tidak menggunakan rumpon sebagai daerah penangkapan ikan.

scholarly journals Correction of copy number induced false positives in CRISPR screens

2017 ◽  
Author(s):  
Antoine de Weck ◽  
Javad Golji ◽  
Mike Jones ◽  
Joshua Korn ◽  
Eric Billy ◽  
...  
Keyword(s):  
False Positive ◽  
Copy Number ◽  
Additive Model ◽  
Drop Out ◽  
Systematic Effect ◽  
Loss Of Function ◽  
Dense Region ◽  
Cancer Models ◽  
General Additive Model ◽  
Genomic Regions

AbstractCell autonomous cancer dependencies are now routinely identified using CRISPR loss-of-function screens. However, a bias exists that makes it difficult to assess the true essentiality of genes located in amplicons, since the entire amplified region can exhibit lethal scores. These false-positive hits can either be discarded from further analysis, which in cancer models can represent a significant number of hits, or methods can be developed to rescue the true-positives within amplified regions. We propose two methods to rescue true positive hits in amplified regions by correcting for this copy number artefact. The Local Drop Out (LDO) method uses the relative lethality scores within genomic regions to assess true essentiality and does not require additional orthogonal data (e.g. copy number value). LDO is meant to be used in screens covering a dense region of the genome (e.g. a whole chromosome or the whole genome). The General Additive Model (GAM) method models the screening data as a function of the known copy number values and removes the systematic effect from the measured lethality. GAM does not require the same density as LDO, but does require prior knowledge of the copy number values. Both methods have been developed with single sample experiments in mind so that the correction can be applied even in smaller screens. Here we demonstrate the efficacy of both methods at removing the copy number effect and rescuing hits from some of the amplified regions. We estimate a 70-80% decrease of false positive hits in regions of high copy number with either method.

scholarly journals The impact of the UK’s first COVID-19 lockdown on rates of violence and aggression on psychiatric inpatient wards

2021 ◽  
Author(s):  
James Payne-Gill ◽  
Corin Whitfield ◽  
Alison Beck
Keyword(s):  
Mental Health ◽  
Time Trend ◽  
Psychiatric Inpatient ◽  
Additive Model ◽  
Interrupted Time Series ◽  
Interrupted Time Series Analysis ◽  
General Additive Model ◽  
Using Data ◽  
The Impact ◽  
Health Trust

AbstractAimsInpatient life in UK mental health hospitals was profoundly altered during the first wave of the COVID-19 pandemic. We analysed whether these changes impacted the rate of violent and aggressive incidents across acute adult wards and psychiatric intensive care units in a South London NHS Mental Health Trust during the first UK lockdown.MethodsWe used an interrupted time series analysis to assess whether the rate of violent and aggressive incidents changed during the lockdown period from 23rd March 2020 to 15th June 2020. We used a quasi-poisson general additive model to model the weekly rate of violent incidents as a function of a seasonal trend, time trend, and impact of lockdown, using data from 1st January 2017 to 27th September 2020.ResultsThere was a 35% increase in the rate of incidents of violence and aggression [IR = 1.35, 95% CI: 1.15 – 1.58, p < 0.001] between March 23rd 2020 and June 15th 2020. In addition, there was strong evidence of temporal (p < 0.001) and seasonal trends (p < 0.001).ConclusionsOur results suggest that restrictions to life increased the rate of violent incidents on the mental health wards studied here.

scholarly journals DESKRIPSI KEADAAN SOSIAL NELAYAN SOMA PAJEKO STUDI KASUS DI KELURAHAN BEO KECAMATAN BEO KABUPATEN KEPULAUAN TALAUD

2013 ◽  
Vol 1 (2) ◽  
Author(s):  
Olvie Erni Sendow ◽  
Djuwita R.R. Aling ◽  
Martha P. Wasak
Keyword(s):  
Social Interaction ◽  
Family Size ◽  
Social Stratification ◽  
Purse Seine ◽  
Primary Data ◽  
Katsuwonus Pelamis ◽  
Everyday Activity ◽  
Job Experience ◽  
Data Collecting ◽  
Size Measure

Abstract Indonesia have upper most resources that is human being resources, where more 220 million civil, there more 60 percent among others life and living in the coastal region. Thereby most among others drape its life to existence of natural resources of coastal area and sea, so that not surprise if everyday activity and activity always relate to existence of resources around. In general problems the lifted is how situation of fisherman social of soma pajeko in Sub-District Of Beo, District Of Beo, Sub-Province Archipelago of Talaud? As for target of research is first, to know and study generality in research area and second to know situation of fisherman social of soma pajeko in Sub-District Of Beo, District Of Beo, Sub-Province Archipelago of Talaud covering age size measure, education, religion, job experience, health, family size measure. Nature of this research is descriptive under colour of research of case study. Data collecting cover primary data and data collecting of secondary. Soma Pajeko represent circular net which included clasified of small purse seine addressed to catch fishs of pelagic which is life by ganging. Haul by using soma pajeko consist of fish of malalugis (Decapterus Sp), fish of tude (Selaroides Sp), fish of deho (Sardinella Sp) and fish of Skipjack Tuna (Katsuwonus pelamis). Deskripsi situation of fisherman social of soma pajeko cover age, education, religion, job experience, health, family size measure, situation of house, entertainment amusement and facility had, organization, social stratification and social interaction. Keywords: purse seine, fisherman, social stratification, social interaction   Abstrak Indonesia memiliki sumberdaya yang menonjol yaitu sumberdaya manusia, dimana lebih kurang 220 juta jiwa penduduk, ada lebih kurang 60% diantaranya hidup dan bermukim di wilayah pesisir. Dengan demikian sebagian besar diantaranya menggantungkan kehidupannya kepada keberadaan sumberdaya alam pesisir dan laut, sehingga tidak mengherankan apabila kegiatan dan aktivitas sehari-hari selalu berkaitan dengan keberadaan sumberdaya di sekitarnya. Secara umum permasalahan yang diangkat adalah bagaimana keadaan sosial nelayan soma pajeko di Kelurahan Beo, Kecamatan Beo, Kabupaten Kepulauan Talaud? Adapun tujuan penelitian adalah pertama, untuk mengetahui dan mempelajari keadaan umum di daerah penelitian dan kedua, untuk mengetahui keadaan sosial nelayan soma pajeko di Kelurahan Beo, Kecamatan Beo, Kabupaten Kepulauan Talaud yang meliputi ukuran umur, pendidikan, agama, pengalaman kerja, kesehatan, ukuran keluarga. Sifat penelitian ini adalah deskriptif dengan dasar penelitian studi kasus. Pengumpulan data meliputi data primer dan pengumpulan data sekunder. Soma pajeko merupakan jaring lingkar yang tergolong dalam klasifikasi mini purse seine yang ditujukan untuk menangkap ikan-ikan pelagis yang hidup secara bergerombol. Hasil tangkapan dengan menggunakan soma pajeko terdiri dari ikan malalugis (Decapterus sp), ikan tude (Selaroides sp), ikan deho (Sardinella sp) dan ikan cakalang (Katsuwonus pelamis). Deskripsi keadaan sosial nelayan soma pajeko meliputi umur, pendidikan, agama, pengalaman kerja, kesehatan, ukuran keluarga, keadaan rumah, fasilitas dan hiburan yang dimiliki, organisasi, stratifikasi sosial dan interaksi sosial. Kata Kunci : soma pajeko, nelayan, stratifikasi sosial, interaksi sosial

scholarly journals A Descriptive Study of HumanSalmonellaSerotype Typhimurium Infections Reported in Ontario from 1990 to 1997

2003 ◽  
Vol 14 (5) ◽  
pp. 267-273 ◽  
Author(s):  
Michael W Ford ◽  
Agricola Odoi ◽  
Shannon E Majowicz ◽  
Pascal Michel ◽  
Dean Middleton ◽  
...  
Keyword(s):  
Risk Factors ◽  
Disease Control ◽  
Rural Areas ◽  
Urban Areas ◽  
Control Strategies ◽  
Additive Model ◽  
Health Concern ◽  
Food Borne ◽  
General Additive Model ◽  
Loess Smoother

BACKGROUND:Salmonellainfections cause gastrointestinal and systemic diseases worldwide and are the leading causes of food-borne illnesses in North America (1-4).Salmonellaserotype typhimurium (ST), in particular, is increasingly becoming a major public health concern because of its ability to acquire multiple resistant genes (5,6).OBJECTIVE: To describe demographic, temporal and geographical distributions, and reported risk factors of nonoutbreak cases of ST reported to a surveillance system in Ontario.METHODOLOGY: Descriptive analyses were performed on data on salmonellosiscases reported in Ontario between 1990 and 1998. Direct age- and sex-standardized rates were computed, and temporal trend analyses were performed using simple linear regression and a general additive model with alocally weighted regression (LOESS) smoother.RESULTS: The mean annual rates of infections with allSalmonellaserotypes and with ST were 27 cases per 100,000 persons and 3.7 cases per 100,000 persons, respectively. Males and children under five years of age had significantly higher rates of both ST and ST definitive type 104 (DT104) infections. There was also evidence of temporal clustering of all strains ofSalmonella,with significantly more cases being reported during the summer. Significantly higher rates of ST DT104 were observed in urban areas compared with rural areas, suggesting potential differences in the geographical distribution of risk factors.CONCLUSIONS: Information on demographic, temporal and geographical distributions, and risk factors is critical in planning disease control strategies. Further prospective analytical observation studies are needed to gain a better understanding of the epidemiology of ST and ST DT104 in Ontario, which will better guide disease control decisions.

scholarly journals PENGGUNAAN PANCING ULUR (HAND LINE) UNTUK MENANGKAP IKAN PELAGIS BESAR DI PERAIRAN BACAN, HALMAHERA SELATAN

2016 ◽  
Vol 6 (1) ◽  
pp. 29
Author(s):  
Enjah Rahmat
Keyword(s):  
Purse Seine ◽  
Thunnus Albacares ◽  
Katsuwonus Pelamis ◽  
Euthynnus Affinis

Penangkapan ikan pelagis besar di perairan Pulau Bacan dilakukan dengan menggunakan alat tangkap huhate (pole and line), pancing ulur (hand line), tonda(troll line), dan pukat cincin (purse seine). Jenis-jenis ikan pelagis besar yang tertangkap terutama jenisjenis madidihang (Thunnus albacares), cakalang(Katsuwonus pelamis), dan tongkol (Euthynnus affinis).

scholarly journals Use of pasture botanical composition data on the accuracy of satellite pasture biomass estimates

2019 ◽  
pp. 249-254 ◽  
Author(s):  
Grant P.S. Anderson ◽  
Mitchell Rawlings ◽  
Zoe Lunniss ◽  
Lorna McNaughton ◽  
Laura Rossi ◽  
...  
Keyword(s):  
Regression Models ◽  
Predictive Power ◽  
Additive Model ◽  
Grazing Management ◽  
Biomass Estimation ◽  
Botanical Composition ◽  
Linear Regression Models ◽  
Composition Data ◽  
General Additive Model ◽  
On Farm

Pasture biomass estimates are valuable to farmers, and satellite pasture biomass estimates can potentially provide the required data for less time and labour. However, the accuracy of satellite estimates of pasture biomass can be affected by the botanical composition of the pasture. In this study, botanical composition data were combined in linear regression models and a general additive model with on-farm and satellite pasture biomass estimates to quantify the increase in predictive power from including botanical composition data. The inclusion of botanical composition data improved the accuracy (model R2) of the satellite pasture biomass estimation; the smallest increase was 0.035 (from 0.725 to 0.760) and the largest increase was 0.111 (from 0.599 to 0.710). Improving the accuracy of satellite estimations of pasture biomass will allow farmers to make more timely and accurate grazing management decisions.

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