scholarly journals Pengaruh perbedaan umpan bubu kerucut terhadap hasil tangkapan rajungan di Perairan Teluk Manado, Kota Manado (The effect of different bait of trap on swimming crab catches in the waters of Manado Bay, Manado City)

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Reynold Damula ◽  
Ivor L. Labaro ◽  
Fransisco P. T. Pangalila
Keyword(s):  
Scientific Information ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Test Analysis ◽  
Chicken Intestine ◽  
Fisheries Resources ◽  
Mangrove Crabs ◽  
The Right ◽  
Almost All ◽  
Swimming Crabs

ABSTRACTThe development of fishing technology (especially fish, mangrove crabs and swimming crabs), is emphasized more on environmentally friendly fishing gear, with expectations of utilizing fisheries resources in a sustainable.  The use of the right bait, is expected to increase the capture capability of the trap; but scientific information like this is not yet widely available.  In addition, the size of the catch of the swimming crab by fishermen is not known with certainty, whether the size (legal size) is appropriate or not as set in Permen KP nomor 1 tahun 2015. This research aims to study the effect type of bait on swimming crab catches, as well as evaluate the size of the catch.  This research was carried out based on experimental methods, and data collection techniques were carried out by operating 6 units of traps for 20 trips.  Three units of trap used scad mackerel bait, while three units used chicken intestine bait.  The operation of traps is carried out in 2 locations, namely Malalayang and Tumumpa waters, each of 10 trips. The total catches were 102 swimming crabs, consisting of 65 individuals caught in the traps of scad mackerel bait and 37 individuals caught in the chicken intestine bait.  The results of the t-test analysis showed that the use of scad mackerel bait and chicken intestine in traps gave the catches of the crab very significantly different, where the bait scad mackerel gives a better catch than the chicken intestine.  The size of the crab catches almost all met the permissible requirements of 98 (94%) both carapace and weight.Keywords: swimming crab, carapace size, trap baits, chicken intestines ABSTRAKPengembangan teknologi penangkapan ikan (khususnya ikan, kepiting bakau dan rajungan), lebih di tekankan pada alat tangkap ikan yang ramah lingkungan, dengan harapan dapat memanfaatkan sumberdaya perikanan secara berkelanjutan.  Penggunaan umpan yang tepat, diduga dapat meningkatkan kemampuan tangkap dari alat tangkap bubu; namun informasi ilmiah seperti ini,  belum banyak tersedia.  Selain itu ukuran hasil tangkapan rajungan oleh nelayan belum diketahui secara pasti, apakah ukurannya (legal size) sesuai atau tidak seperti yang diatur dalam Permen KP nomor 1 tahun 2015. Penelitian ini bertujuan untuk mempelajari pengaruh jenis umpan terhadap hasil tangkapan ranjungan, serta mengevaluasi ukuran hasil tangkapan. Penelitian ini dikerjakan berdasarkan metode eksperimental, dan teknik pengumpulan data dilakukan dengan cara mengoperasikan 6 unit bubu kerucut masing-masing 3 unit bubu menggunakan umpan ikan layang, sedangkan  3 unit bubu lainnya menggunakan umpan usus ayam. Pengoperasian bubu kerucut dilakukan pada 2 lokasi yaitu di perairan Malalayang dan Tumumpa, masing-masing 10 trip. Total hasil tangkapan sebanyak 102 ekor, yang terdiri dari 65 ekor tertangkap pada bubu umpan ikan layang  dan 37 ekor tertangkap pada bubu umpan usus ayam. Hasil analisis uji t menunjukan bahwa penggunaan umpan ikan layang dan usus ayam pada bubu kerucut memberikan hasil tangkapan rajungan yang sangat berbeda nyata, dimana umpan ikan layang memberikan hasil tangkapan rajungan lebih baik daripada umpan usus ayam. Ukuran hasil tangkapan rajungan hampir semuanya memenuhi persyaratan yang diperbolehkan yaitu 98 ekor (94 %) baik ukuran karapaks maupun berat.Kata-kata kunci:  ranjungan, ukuran karapas, umpan bubu, usus ayam

scholarly journals Perbandingan Hasil Tangkapan Rajungan Pada Alat Tangkap Bubu Kerucut dengan Umpan yang Berbeda (The Comparison Catch of Swimming crab In Trap with Different Bait)

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Fransisco P.T. Pangalila ◽  
Ivor L. Labaro
Keyword(s):  
Data Analysis ◽  
Comparative Analysis ◽  
Coastal Waters ◽  
Experimental Methods ◽  
T Test ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Test Analysis ◽  
Swimming Crabs

Swimming Crab (Portunus pelagicus) is one of the economically important marine commodities produced from the coastal waters of Indonesia. The Catching of swimming crabs directly from nature carried out using various types of fishing gear, one of which is a trap. Methods using experimental methods. Therefore, the objective of this research was to study the effect of  type of bait to catch swimming crab. Two kinds of bait, the scad mackerel and chicken intestines. Catch data were collected using 6 units of  trap, operated in coastal waters of Manado bay; and data analysis is based on a  t-test is done using a comparative analysis of the value of the middle observation sample pairs. Besides evaluation carapace size and weight (legal size) swimming crab based Permen KP nomor 1 tahun 2015. The catch was 76 swimming crabs in total, and the results of t-test analysis showed that the use of bait scad mackerel and chicken intestines on traps caused high significant effect in catch. The size of swimming crabs showed that nearly all eligible allowable catch of 71 individuals (93%) both carapace size and weight, and only 5 individuals (7%) who do not eligible allowable catch. Keywords : swimming crab, carapace size, trap baits, chicken intestines.   ABSTRAK Rajungan (Portunus pelagicus) merupakan salah satu komoditi hasil laut ekonomis penting yang dihasilkan dari perairan pantai Indonesia.  Penangkapan rajungan langsung dari alam dilakukan dengan menggunakan berbagai jenis alat tangkap, salah satunya adalah bubu.  Metode Penelitian menggunakan metode eksperimental. Penelitian ini bertujuan untuk mempelajari pengaruh jenis umpan terhadap hasil tangkapan rajungan. Dua jenis umpan yang digunakan, yaitu ikan layang dan usus ayam. Data tangkapan dikumpulkan dengan menggunakan 6 unit bubu, yang dioperasikan di perairan pantai Malalayang Teluk Manado; dan analisis data didasarkan pada uji t yang dikerjakan menggunakan analisis perbandingan nilai tengah contoh pengamatan berpasangan.  Selain itu dilakukan evaluasi ukuran karapas dan berat (legal size) rajungan berdasarkan Permen KP nomor 1 tahun 2015. Total hasil tangkapan 76 ekor, dan hasil analisis uji t menunjukkan bahwa penggunaan umpan ikan layang dan usus ayam pada bubu kerucut memberikan hasil tangkapan rajungan yang sangat berbeda nyata.  Ukuran hasil tangkapan rajungan yang diperoleh menunjukkan bahwa hampir semuanya memenuhi persyaratan tangkapan yang diperbolehkan yaitu 71 ekor (93 %) baik ukuran karapas maupun berat, dan hanya 5 ekor (7 %) yang tidak memenuhi persyaratan. Kata-kata kunci : rajungan, ukuran karapas, umpan bubu, usus ayam.

scholarly journals Pengaruh ekstrak minyak cumi pada umpan bubu terhadap hasil tangkapan kepiting bakau dan rajungan di Perairan Malise Kecamatan Tabukan Tengah

2016 ◽  
Vol 2 (3) ◽  
Author(s):  
Maichel Arvan Pananggung ◽  
Ivor L. Labaro ◽  
Emil Reppie
Keyword(s):  
Coastal Waters ◽  
Scylla Serrata ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Mangrove Crab ◽  
Gill Net ◽  
Oil Extract ◽  
Mangrove Crabs ◽  
By Catch

ABSTRACT Mangrove crab (Scylla serrata) and swimming crab (Portunus pelagicus) are economically important marine commodities produced from the coastal waters of Sangihe Islands Regency. But those marine commodity products are usually only caught accidentally with a bottom gill net. There has been a special trap fishing gear for that resources, but not known well by local fishermen. Addition of squid oil extraction baits could increase the fishing power of mangrove crab and swimming crab traps. This research aims to study the effect of squid oil extract on traps bait to catch mangrove crab and swimming crab; and identify the types of biota captured. This research was done in coastal waters of Malise village, Tabukan Tengah District of Sangihe Islands Regency for 2 weeks September 2015; based on experimental method. Six unit traps were operated ten trips where three units of them used scad mackerel bait that injected with squid oil extract, and tree other units just used scad mackerel bait without extract; and the capture data were analyzed using t test. The catch was 142 individuals (135 mangrove crabs and 7 swimming crab); where 86 crabs was caught by scad mackerel bait with squid oil extract, and 56 crabs caught with bait without squid oil extract. The analysis showed that the use of squid oil extracts on trap baits increased the catch. Keywords: mangrove crab, swimming crab,trap baits, squid oil extract, Sangihe   ABSTRAK[1] Kepiting bakau (Scylla serrata) dan rajungan (Portunus pelagicus) merupakan komoditi hasil laut ekonomis penting yang dihasilkan dari perairan pantai Kabupaten Kepulauan Sangihe. Tetapi komoditi hasil laut tersebut biasanya hanya tertangkap tanpa sengaja (by catch) dengan jaring insang dasar. Sebenarnya telah ada alat tangkap bubu khusus untuk kepiting bakau dan rajungan, tetapi belum dikenal oleh nelayan lokal. Pemberian ekstrak minyak cumi pada umpan, diduga dapat meningkatkan kemampuan tangkap dari bubu kepiting bakau dan rajungan. Penelitian ini bertujuan untuk mempelajari pengaruh ekstrak minyak cumi pada umpan bubu terhadap hasil tangkapan kepiting bakau dan rajungan, dan mengidentifikasi jenis-jenis biota yang tertangkap. Penelitian ini dilakukan di perairan Malise Kecamatan Tabukan Tengah, Kabupaten Kepulauan Sangihe; selama 2 minggu pada bulan September 2015; yang didasarkan pada metode eksperimental. Enam unit bubu dioperasikan selama sepuluh trip untuk mengumpulkan data; di mana tiga unit menggunakan umpan ikan layang yang disuntikan ekstrak minyak cumi, dan tiga unit lainnya hanya menggunakan umpan ikan laying tanpa ekstrak; dan data dianalisis dengan uji t. Tangkapan total berjumlah 142 ekor (135 ekor kepiting bakau dan 7 ekor rajungan); di mana 86 ekor tertangkap dengan umpan layang yang diberi ekstrak minyak cumi, dan 56 ekor tertangkap dengan umpan tanpa ekstrak. Hasil analisis menunjukkan bahwa penggunaan ekstrak minyak cumi pada umpan bubu, memberikan hasil tangkapan yang sangat berbeda dibandingkan dengan umpan tanpa ekstrak minyak cumi. Kata-kata kunci: kepiting bakau, rajungan, umpan bubu, ekstrak minyak cumi, Sangihe  

scholarly journals PENGARUH PENAMBAHAN FUNEL PADA ALAT TANGKAP BUBU TERHADAP HASIL TANGKAPAN RAJUNGAN (Portugus pelagicus) DI PERAIRAN REMBANG, JAWA TENGAH (The Effect of Funnel Addition on Trap Toward catch of Blue Swimming Crab in Rembang Sea waters)

2018 ◽  
Vol 13 (2) ◽  
pp. 100
Author(s):  
Bogi Budi Jayanto ◽  
Kukuh Eko Prihantoko ◽  
Imam Triarso ◽  
Faik Kurohman
Keyword(s):  
Sea Water ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Fisheries Resources ◽  
Central Java

Bubu (Trap) merupakan alat tangkap yang dioperasikan secara pasif yang termasuk alat tangkap ramah lingkungan, dengan keunggulan hasil tangkapan masih dalam kondisi hidup dan segar. Target penangkapan dari alat tangkap Bubu salah satunya adalah Rajungan (Portunus pelagicus), yang merupakan komoditas ekonomis penting perikanan. Indikasi produktivitas suatu alat tangkap adalah apabila hasil tangkapan didominasi dengan target tangkapan dengan nilai efektivitas yang tinggi. Modifikasi bentuk dan jumlah Funnel (pintu masuk) pada Bubu merupakan salah satu cara memperbesar peluang target  masuk kedalamnya. Penelitian mengenai penambahan jumlah funnel bertujuan untuk meningkatkan peluang Rajungan tertangkap. Rancang bangun funnel sebanyak 6 buah (Bubu Payung) akan memperbesar peluang Rajungan sebagai target tangkapan tertangkap dibandingkan bubu dengan jumlah  funnel 2 buah. Melalui metode penelitian experimental fishing di perairan Rembang, Jawa Tengah didapatkan hasil bahwa Bubu dengan funnel sebanyak 6 buah (Bubu payung) menghasilkan hasil tangkapan lebih banyak dibandingkan dengan Bubu dengan funnel sebanyak 2 buah. Bubu was a passive fishing gear and kind of responsible fishing gear categories. Catch on fresh condition is one of benefit from this gear. Rajungan (Portunus pelagicus) is one of important fisheries resources and valuable. One of the productivity indicator on fishing gear is if catch dominated by targetted of fish and effectiveness value is high. Trap modification on shape and amount funnel is one of techniques to increase opportunity fish that get caught. The aim of this study is to increase opportuniy caught of Rajungan with different funnel amount. Bubu with six funnel will enlarge opportunity of Rajungan that caught than of two funnel. By experimental fishing in Rembang sea water, Province of  Central Java, the result of this study shown that bubu with six funnel get more larged rajungan catch than bubu with two funnel.

scholarly journals PEMANFAATAN UMPAN ALTERNATIF LIMBAH KEPALA UDANG DAN WAKTU IMMERSING BUBU LIPAT TERHADAP HASIL TANGKPAAN RAJUNGAN (Portunus pelagicus) DI PERAIRAN KARIMUNJAWA KABUPATEN JEPARA (Utilization of Alternative Shrimp Head Waste Feed and Immersing Time of Pot on the Catch of Swimming Crab (Portunus Pelagicus) in Karimunjawa Waters of Jepara District)

2019 ◽  
Vol 14 (2) ◽  
pp. 91
Author(s):  
Martiana Neilirrohmah ◽  
Aristi Dian Purnama Fitri ◽  
Sardiyatmo Sardiyatmo
Keyword(s):  
Data Analysis ◽  
Research Method ◽  
Household Waste ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Fresh Fish ◽  
Normality Test ◽  
Shrimp Head ◽  
Swimming Crabs

Bubu lipat adalah alat tangkap yang digunakan untuk menangkap rajungan di Perairan Karimunjawa. Umpan yang biasa digunakan yaitu ikan segar (Damselfish), namun memiliki kendala sehingga peneliti memberikan solusi menggunakan umpan limbah kepala udang (Paneus merguensis) karena murah, bisa didapat dari limbah rumah tangga, serta mengandung protein yang dapat merangsang indera penciuman Rajungan (Portunus pelagicus). Tujuan penelitian adalah menganalisis hasil tangkapan Rajungan (Portunus pelagicus) dengan bubu lipat umpan limbah kepala udang (Penaeus merguensis) dan umpan ikan segar (Damselfish), serta perbedaan waktu immersing (6 jam dan 12 jam). Metode penelitian yang digunakan adalah experimental fishing dengan 8 kali pengulangan. Penelitian dilakukan di Perairan Karimunjawa, Kabupaten Jepara pada bulan Februari 2018. Analisis data menggunakan uji normalitas, uji homogenitas, dan uji-t. Hasil tangkapan Rajungan (Portunus pelagicus) dengan umpan limbah kepala udang lebih sedikit dibandingkan dengan umpan ikan segar (Sig. 0,538). Hasil tangkapan Rajungan (Portunus pelagicus) pada waktu immersing 6 jam lebih banyak dibandingan waktu immersing 12 jam (Sig. 0,512). Tidak terdapat interaksi antara umpan dan waktu immersing terhadap hasil tangkapan Rajungan (Portunus pelagicus) pada penangkapan bubu lipat di Karimunjawa. Trap is one of the fishing gear used to catch a swimming crabs in Karimunjawa. Usually the bait is used fresh baits (Damselfish), but have constraints so the researcher giving a solution to use shrimp head waste (Penaeus merguensis) because cheap, can get from household waste, and contains protein that can stimulate the sense of swimming crabs’s smell. The research purposes to analyze the ratio of the catches between pot using shrimp head waste (Penaeus merguensis) with fresh baits (Damselfish) and immersing time difference (6 hours and 12 hours). The research method used in this study was the experimental fishing with 8 times repetition. The research held at Karimunjawa waters of Jepara District on February 2018. The data analysis used were the normality test, the homogenity test and t-test. The resulted of swimming crabs on the pot with shrimp head waste is less more than fresh baits (Sig. 0,538) . The resulted of swimming crabs on pot with 6 hours of immersing time is in the largest number of catch (Sig. 0,512). Fresh fish baits and shrimp head waste feed and immersing time between 6 hours and 12 hours no interaction the catch of swimming crabs in Karimunjawa 

scholarly journals Pengaruh penambahan ekstrak minyak tenggiri pada umpan bubu terhadap hasil tangkapan ranjungan di perairan Malalayang, Kota Manado

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Thomson M. Watem ◽  
Henry J. Kumajas ◽  
Fanny Silooy
Keyword(s):  
Coastal Waters ◽  
Scientific Information ◽  
Experimental Methods ◽  
T Test ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
North Sulawesi ◽  
Marine Product ◽  
Oil Extract

ABSTRACT Swimming crab (Portunus pelagicus) is one of the economically important marine product commodities resulting from coastal waters Indonesia. Swimming crab in coastal waters of North Sulawesi usually caught accidentally with bottom gillnet. There has been a special fishing gear for crab traps, but not known by local fishermen. Addition of mackerel oil extract on baits could increase the fishing power of swimming crab traps but this kind of scientific information, particularly on swimming crab, not widely available yet. This research aims to study the effect of mackerel oil extract on traps bait to catch swimming crab; and to identify the types of biota captured. This research was conducted in coastal waters of Malalayang Satu, Malalayang District, Manado City; in December 2014 to January 2015; which is based on experimental methods. Six units of trap were operated seven nights; where tree units of them used scad mackerel bait that injected by mackerel oil extract, and tree other units just used scad mackerel bait without mackerel oil extract; and the capture data were analyzed by t test. The catch was 58 swimming crab in total; 42 fish was caught by scad mackerel bait with mackerel oil extract, and 16 swimming crab was caught by bait without mackerel oil extract. Analysis of t test showed that the use of mackerel oil extracts in bait traps, giving different swimming crab catches compared with bait without mackerel oil extracts. Keywords: swimming crab, trap, mackerel oil, Malalayang Manado   ABSTRAK Ranjungan (Portunus pelagicus) merupakan salah satu komoditi hasil laut ekonomis penting yang dihasilkan dari perairan pantai Indonesia. Rajungan di perairan pantai Sulawesi Utara biasanya tertangkap tanpa sengaja dengan jaring insang dasar. Sebenarnya telah ada alat tangkap bubu khusus untuk rajungan, tetapi belum dikenal oleh nelayan lokal. Pemberian ekstrak berupa minyak tenggiri pada umpan diduga dapat meningkatkan kemampuan tangkap dari bubu ranjungan; namun informasi ilmiah seperti ini, khususnya pada ranjungan, belum banyak tersedia. Penelitian ini bertujuan untuk mempelajari pengaruh ekstrak minyak tenggiri pada umpan bubu terhadap hasil tangkapan ranjungan; dan mengidentifikasi jenis-jenis biota yang tertangkap. Penelitian ini dilakukan di perairan pantai Kelurahan Malalayang Satu, Kecamatan Malalayang, Kota Manado; pada bulan Desember 2014 sampai bulan Januari 2015; yang didasarkan pada metode experimental fishing. Enam unit bubu dioperasikan tujuh malam; di mana tiga unit menggunakan umpan ikan layang yang disuntikkan ekstrak minyak tenggiri, dan tiga unit lainnya hanya menggunakan umpan ikan layang tanpa ekstrak; dan data dinalisis dengan uji t. Tangkapan total berjumlah 58 ekor; 42 ekor tertangkap dengan umpan layang yang diberi ekstrak minyak tenggiri, dan 16 ekor tertangkap dengan umpan tanpa ekstrak minyak tenggiri. Hasil analisis uji t menunjukkan bahwa penggunaan ekstrak minyak tenggiri pada umpan bubu memberikan hasil tangkapan ranjungan yang lebih banyak dibandingkan dengan umpan tanpa ekstrak minyak tenggiri. Kata-kata kunci: rajungan, bubu, minyak tenggiri, Malalayang Manado. [1] Penulis untuk penyuratan; email: [email protected]

scholarly journals Pengaruh bentuk bubu terhadap hasil tangkapan rajungan portunus pelagicus di perairan pantai Desa Kema tiga Kabupaten Minahasa Utara Provinsi Sulawesi Utara (The effect of pots shape toward the catch of swimming crab in coastal waters Kema Tiga Village)

2017 ◽  
Vol 2 (5) ◽  
Author(s):  
Moch. Abdul Chalim ◽  
Johnny Budiman ◽  
Emil Reppie
Keyword(s):  
Coastal Waters ◽  
Scientific Information ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Nutritional Content ◽  
Portunus Pelagicus ◽  
Rectangular Shape ◽  
Conical Shape ◽  
North Sulawesi ◽  
By Catch

Swimming crab (Portunus pelagicus) is one of the fishery commodities that have high sales value for which raced flavor and high nutritional content. This swimming crab in coastal waters of North Sulawesi usually caught accidentally (by catch) with bottom gillnets. There has been a special fishing gear for crab traps, but not known by local fishermen. The differences of trap shape could increase the fishing power of swimming crab traps; but such scientific information is not widely available yet. Therefore, this research aimed to study the effect of pots shape to catch swimming crab; and identifies the types of biota captured. This research was conducted in the coastal waters of  Kema Tiga village, North Minahasa Regency; from September to December 2014; which is based on the experimental method. Bubu six units of traps (three units conical shape, and three other rectangular shape), operated for eight nights to collect data; used scad mackerel bait; and the capture data were analyzed by t test.  The catch was 86 swimming crab in total; 56 was caught by conical shape traps, and 30 individuals were caught by rectangular shape traps. Analysis of test showed that t0 = 4.596> t table 0.01; 7 = 3.499, which means that the use of conical shape traps, giving highly significantly different swimming crab catches compared to rectangular shape traps. Keywords: Swimming crab, trap, mackerel bait, North Minahasa   ABSTRAK Rajungan (Portunus pelagicus) merupakan salah satu komoditi perikanan yang memiliki nilai jual tinggi karena memiliki rasa yang lezat dan kandungan gizi yang tinggi). Rajungan  ini di perairan pantai Sulawesi Utara biasanya tertangkap tanpa sengaja (by catch) dengan jaring insang dasar. Sebenarnya telah ada alat tangkap bubu khusus untuk rajungan, tetapi belum dikenal oleh nelayan lokal. Perbedaan bentuk bubu diduga dapat meningkatkan kemampuan tangkap dari bubu ranjungan; namun informasi ilmiah seperti ini belum banyak tersedia. Oleh karena itu, penelitian ini bertujuan untuk mempelajari pengaruh bentuk bubu terhadap hasil tangkapan ranjungan; dan mengidentifikasi jenis-jenis biota yang tertangkap.  Penelitian ini dilakukan di perairan pantai Desa Kema Tiga, Kabupaten Minahasa Utara; pada bulan September sampai Desember 2014; yang didasarkan pada metode eksperimental. Enam unit bubu (tiga unit bentuk kerucut terpancung dan tiga unit bentuk empat persegi) dioperasikan selama delapan malam untuk mengumpulkan data; menggunakan umpan ikan layang; dan data dinalisis dengan uji t. Tangkapan total berjumlah 86 ekor; 56 ekor tertangkap dengan bubu bentuk kerucut terpancung, dan 30 ekor tertangkap dengan bubu bentuk empat persegi. Hasil analisis menunjukan bahwa t hitung = 4,596 > t tabel 0,01;7 = 3,499, yang berarti bahwa penggunaan konstruksi bubu bentuk kerucut terpancung, memberikan hasil tangkapan rajungan yang sangat berbeda nyata dibandingkan dengan konstruksi bubu empat persegi. Kata-kata kunci: Rajungan, bubu, umpan ikan layang, Minahasa Utara.

scholarly journals Size selectivity and optimal soaking time of hoops and traps targeting the blue swimming crab Callinectes arcuatus in Cuyutlan Lagoon, Mexico

2021 ◽  
Vol 56 (1) ◽  
pp. 42
Author(s):  
Mauricio Salas-Maldonado ◽  
Elaine Espino-Barr ◽  
Emigdio Marín-Enríquez ◽  
Alberto Bartoleño-Sánchez ◽  
Leonardo Daniel Valdez-Carrazco
Keyword(s):  
Carapace Width ◽  
Commercial Fishing ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Size Selectivity ◽  
Soaking Time ◽  
The Third ◽  
Fishing Gears ◽  
Catch Rates ◽  
Swimming Crabs

The selectivity of two types of commercial fishing gear (crab hoop/traditional gear and rigid rectangular cage traps) targeting blue crabs (Callinectes arcuatus) in Cuyutlan Lagoon, Mexico, was assessed. The effect of soak time on crab catches versus the retention and escape rate of organisms was also evaluated. Results suggested that traps captured larger individuals than hoops. The carapace width of crabs was significantly different between the fishing gears used: 63.9% of crabs caught with hoops were < 95 mm (sizes ranged from 40 to 113 mm) and 40.7% of crabs caught with traps were < 95 mm (range: 49 to 120 mm). Results also showed that catch rates were high during the first two hours and decreased after the third hour. The crabs tended to escape after several hours of soak time. The study found that the traps captured larger crabs than the hoops, suggesting that traps are a suitable fishing gear for catching blue swimming crabs in Cuyutlan Lagoon.

scholarly journals Development of central auditory processes in Polish children and adolescents at the age from 7 to 16 years

2021 ◽  
Author(s):  
Monika Lewandowska ◽  
Rafał Milner ◽  
Małgorzata Ganc ◽  
Elżbieta Włodarczyk ◽  
Joanna Dołżycka ◽  
...  
Keyword(s):  
Children And Adolescents ◽  
School Students ◽  
Frequency Pattern ◽  
Speech In Noise ◽  
Age Related ◽  
Right Ear Advantage ◽  
The Right ◽  
Almost All ◽  
Test Retest Reliability ◽  
Auditory Processes

AbstractThere are discrepancies in the literature regarding the course of central auditory processes (CAP) maturation in typically developing children and adolescents. The purpose of the study was to provide an overview of age – related improvement in CAP in Polish primary and secondary school students aged 7–16 years. 180 children/adolescents, subdivided into 9 age categories, and 20 adults (aged 18–24 years) performed the Dichotic Digit Test (DDT), Duration Pattern Test (DPT), Frequency Pattern Test (FPT), Gap Detection Test (GDT) and adaptive Speech-in-Noise (aSpN). The 12-year-olds was retested after w week. We found the age effects only for the DDT, DPT and FPT. In the right ear DDT the 7-year-olds performed more poorly than all groups ≥12. In the left ear DDT both 7- and 8-year-olds achieved less correct responses compared with the 13-, 14-, 15-year-olds and with the adults. The right ear advantage was greater in the 7-year-olds than in the 15-year-olds and adult group. At the age of 7 there was lower DPT and FPT scores than in all participants ≥13 whereas the 8-year-olds obtained less correct responses in the FPT than all age categories ≥12. Almost all groups (except for the 7-year-olds) performed better in the DPT than FPT. The test-retest reliability for all tests was satisfactory. The study demonstrated that different CAP have their own patterns of improvement with age and some of them are specific for the Polish population. The psychoacoustic battery may be useful in screening for CAP disorders in Poland.

scholarly journals The role and value of science in shark conservation advocacy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
David S. Shiffman ◽  
Catherine C. Macdonald ◽  
S. Scott Wallace ◽  
Nicholas K. Dulvy
Keyword(s):  
Conservation Status ◽  
Scientific Information ◽  
Economic Benefits ◽  
Global Management ◽  
Fisheries Resources ◽  
Policy Goals ◽  
Shark Conservation ◽  
Scientific Results ◽  
State Of The Science ◽  
Key Questions

AbstractMany species of sharks are threatened with extinction, and there has been a longstanding debate in scientific and environmental circles over the most effective and appropriate strategy to conserve and protect them. Should we allow for sustainable fisheries exploitation of species which can withstand fishing pressure, or ban all fisheries for sharks and trade in shark products? In the developing world, exploitation of fisheries resources can be essential to food security and poverty alleviation, and global management efforts are typically focused on sustainably maximizing economic benefits. This approach aligns with traditional fisheries management and the perspectives of most surveyed scientific researchers who study sharks. However, in Europe and North America, sharks are increasingly venerated as wildlife to be preserved irrespective of conservation status, resulting in growing pressure to prohibit exploitation of sharks and trade in shark products. To understand the causes and significance of this divergence in goals, we surveyed 155 shark conservation focused environmental advocates from 78 environmental non-profits, and asked three key questions: (1) where do advocates get scientific information? (2) Does all policy-relevant scientific information reach advocates? and (3) Do advocates work towards the same policy goals identified by scientific researchers? Findings suggest many environmental advocates are aware of key scientific results and use science-based arguments in their advocacy, but a small but vocal subset of advocates report that they never read the scientific literature or speak to scientists. Engagement with science appears to be a key predictor of whether advocates support sustainable management of shark fisheries or bans on shark fishing and trade in shark products. Conservation is a normative discipline, and this analysis more clearly articulates two distinct perspectives in shark conservation. Most advocates support the same evidence-based policies as academic and government scientists, while a smaller percentage are driven more by moral and ethical beliefs and may not find scientific research relevant or persuasive. We also find possible evidence that a small group of non-profits may be misrepresenting the state of the science while claiming to use science-based arguments, a concern that has been raised by surveyed scientists about the environmental community. This analysis suggests possible alternative avenues for engaging diverse stakeholders in productive discussions about shark conservation.

Variation in fur farm and wild populations of the red fox, Vulpes vulpes (Carnivora: Canidae) — Part I: Morphometry

2016 ◽  
Vol 96 (4) ◽  
pp. 589-597 ◽  
Author(s):  
Magdalena Zatoń-Dobrowolska ◽  
Magdalena Moska ◽  
Anna Mucha ◽  
Heliodor Wierzbicki ◽  
Piotr Przysiecki ◽  
...  
Keyword(s):  
Vulpes Vulpes ◽  
Selective Breeding ◽  
Red Fox ◽  
Tail Length ◽  
Morphometric Traits ◽  
Red Foxes ◽  
Ear Height ◽  
Morphological Differences ◽  
The Right ◽  
Almost All

This paper demonstrates the influence of artificial selection on morphometric traits in the red fox [Vulpes vulpes (Linnaeus, 1758)]. Measurements and two proportion coefficients were analysed in 132 wild and 199 farm red foxes. The two groups differed significantly (P ≤ 0.05) on all but one of the measurements. Eight out of 11 measurements were significantly greater in the farm fox population, while only tail length, ear height, and length of the right hind limb were greater in the population of wild foxes. The opposite trend was observed when analysing variation in the measurements — the farm foxes were characterized by a greater variability only in the case of body weight, body length, and breadth of chest. When analysing the sexual dimorphism index in different sex and population groups, in almost all analysed traits, the greatest differences occurred between farm males and wild females. All of the traits examined in this study are important for survival of wild foxes. However, because importance of some traits was reduced during domestication and selective breeding (farm foxes do not have to fight for survival), the genetic relationship between them may have weakened. Other possible causes of morphological differences between the studied groups of red foxes are discussed as well.

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