scholarly journals PENGARUH UKURAN MATA JARING BUBU LIPAT TERHADAP JUMLAH DAN UKURAN HASIL TANGKAPAN RAJUNGAN DI PERAIRAN UTARA LAMONGAN, JAWA TIMUR

2018 ◽  
Vol 24 (3) ◽  
pp. 175
Author(s):  
Mahiswara Mahiswara ◽  
Hufiadi Hufiadi ◽  
Baihaqi Baihaqi ◽  
Tri Wahyu Budiarti
Keyword(s):  
Carapace Width ◽  
Mesh Size ◽  
Fishing Gear ◽  
Total Catch

Bubu lipat merupakan alat tangkap yang banyak dioperasikan nelayan untuk menangkap rajungan, namun memiliki selektivitas rendah tergantung pada ukuran mata jaring yang digunakan. Tingkat selektivitas bubu lipat perlu ditingkatkan agar tangkapan rajungan memiliki ukuran layak tangkap sesuai peraturan. Penelitian uji coba pengoperasian bubu lipat rajungan dengan berbagai ukuran mata jaring yaitu 1¼ , 2, 2½ dan 3 inci, berbentuk bujur sangkar telah dilakukan di perairan utara Lamongan, Jawa Timur. Jumlah bubu lipat yang dioperasikan untuk setiap ukuran mata jaring sebanyak 150 unit per tawur/setting. Tujuan penelitian, untuk mengetahui pengaruh ukuran mata jaring bubu terhadap jumlah dan ukuran hasil tangkapan rajungan. Hasil analisis menunjukkan bahwa perbedaan ukuran mata jaring berpengaruh nyata terhadap hasil tangkapan bubu lipat rajungan. Hasil tangkapan rajungan dari bubu lipat mata jaring 2 inci (2,17 kg/setting) tidak berbeda nyata dengan mata jaring 1¼ inci (2,08 kg/setting). Ukuran lebar karapas (CW=carapace width) rajungan layak tangkap (> 100 mm) semakin besar dengan meningkatnya ukuran mata jaring. Nilai tertinggi prosentase tangkapan rajungan ukuran besar (CW > 100 mm), ditemukan pada bubu lipat ukuran mata jaring 3 inci mencapai 98 % dari total rajungan yang tertangkap. Collapsible crab pot is a common fishing gear that has been operated by many fishermen, however this kind of fishing gear has a low selectivity. The selectivity level of crab pot needs to be increased so that the size of crab catch comply to the allowable legal size. Fishing trials of crab pot with the mesh size of 1¼, 2, 2½ and 3 inch square-shaped has been done in the waters of north Lamongan, East Java. The objectives of this research is to determine the effect of mesh size to the number and size of the catches. The results showed that different mesh size has significant effect on the catch of pot. However the catch of a 2 inch mesh size pot (of 2.17 kg / setting) was not significantly different with the catch of pot with 1¼ inch mesh size (of 2.08 kg / setting). Percentage of BSC catch with carapace width (CW) > 100 mm increased by increasing of mesh size of net. The highest percentage (98 % of the total catch) was obtained from  the 3-inch mesh sizes.

Reproductive biology of Polybius henslowii Leach, 1820 (Decapoda, Polybiidae): a discard species from the northwestern Portuguese beam trawl fishery

Crustaceana ◽  
2014 ◽  
Vol 87 (7) ◽  
pp. 784-800 ◽  
Author(s):  
L. Magalhães ◽  
M. Felício ◽  
M. B. Gaspar ◽  
V. Quintino ◽  
A. M. Rodrigues
Keyword(s):  
Reproductive Biology ◽  
Current Knowledge ◽  
Carapace Width ◽  
Fishing Gear ◽  
Northern Coast ◽  
Beam Trawl ◽  
Total Catch ◽  
Important Species ◽  
Trawl Fishery ◽  
Minimum Landing Size

Polybius henslowii Leach, 1820, a Portunid crab distributed from the British Isles to Morocco and the Mediterranean Sea is caught in high densities by many types of fishing gear and frequently thrown back to the sea. Along the northern coast of Portugal, P. henslowii is an important species discarded in beam trawl fishery. There are no quantitative estimations of discards and very little is known about its biology, information that is needed to value this species. The present work was conducted from March 2007 to December 2010 in order to improve the current knowledge of the reproductive biology of P. henslowii. By-catches were registered aboard commercial vessels that volunteered to participate in the study. In that period P. henslowii represented 57.3% of the total catch and was present in all hauls analysed. The target species, Palaemon serratus (Pennant, 1777), represented 1.2% of the total catch, showing the low selectivity of the fishing gear and the need for suppression of this gear to catch this shrimp species. Differences in size between sexes were found, with males being larger and heavier than females. Mature females occurred mainly in autumn and the carapace width at which 50% of the females reach maturity was estimated to be 37.8 mm, which could be set as the minimum landing size of this potential exploitable resource. A macroscopic ovarian maturity stages classification was proposed, allowing a rapid field assessment of female sexual maturity. This study fills a gap in the knowledge of a very important species discarded in beam trawl fishery that may be basis of further work.

scholarly journals EFISIENSI TEKNIS DAN SELEKTIVITAS ALAT TANGKAP JARING INSANG (GILLNET) TERHADAP KOMPOSISI HASILTANGKAPAN DI PERAIRAN SEMARANG (Technical Efficiency and Selectivity of Fishing Gear Gillnet to Composition of Fish Capture in Semarang Water)

2018 ◽  
Vol 13 (2) ◽  
pp. 126
Author(s):  
Vatharany Liana Putri ◽  
Faik Kurohman ◽  
Aristi Dian Purnama Fitri
Keyword(s):  
Technical Efficiency ◽  
Significant Influence ◽  
Research Method ◽  
Mesh Size ◽  
T Test ◽  
Fishing Gear ◽  
Total Catch ◽  
Fish Resources ◽  
Gill Net

Pengoperasian Gill Net  akan berpengaruh terhadap stok sumberdaya ikan apabila tidak diatur dengan baik. Strategi manajemen sumberdaya ikan diperlukan agar optimalisasi hasil tangkapan dan kelestarian sumberdaya ikan tetap terjaga. Tujuan dari penelitian ini adalah untuk menganalisis nilai efisiensi teknis dan nilai selektivitas alat tangkap Jaring Insang (Gill Net ) terhadap komposisi hasil tangkapan. Metode penelitian yang digunakan adalah deskriptif bersifat studi kasus. Lokasi penelitian  di perairan Semarang. Obyek pengamatan adalah Gill Net .  Analisis data yang digunakan adalah uji Independent T-Test. Hasil Penelitian menunjukkan bahwa alat tangkap Gill Net  terdapat dua mesh size yaitu 1,4 inci dan 3,5 inci. Total hasil tangkapan Gill Net  dengan mesh size 1,4 inci sebesar 38.350 kg sedangkan Gill Net  dengan ukuran 3,5 inci sebesar 15.220 kg. Nilai efisiensi yang terdapat pada mesh size 1,4 inci adalah 30 sedangkan, mesh size 3,5 inci memperoleh poin sebesar 20. Berdasarkan pengolahan uji Independent T-test bahwa terdapat pengaruh signifikan antara komposisi hasil tangkapan Gill Net  terhadap mesh size 1,4 inci dan 3,5 inci. Kesimpulan yang diperoleh dari penelitian ini adalah status alat tangkap Gill Net  dengan mesh size 1,4 inci lebih efisien daripada mesh size 3,5 inci. The way to operation the Gill Net  will affect the stock of fish resources if not properly regulated. Strategy to manage the fish resources is needed to optimize amount of catch and create the sustainable fish resources. The aim of research was to analyze level of technical efficiency and selectivity Gillnets to the composition of the catches. The research method used case study on technical efficiency Gillnets in Semarang’s waters. The results of the research, Gillnets have two mesh size, 1.4 inch and 3.5 inch. Total catch of Gillnets with mesh size 1.4 inch was 38.350 kg while Gillnets catch with mesh size 3.5 inch was 15.220 kg. Based on independence T-test that there was significant influence between the composition of Gillnets catches to mesh size 1.4 inch and 3,5 inch. efficiency point with mesh size 1,4 inch was 30, whereas mesh size 3,5 inch obtained 20 point. The conclusion from this research is stat us of fishing gear Gillnets with mesh size 1,4 inch more efficient than mesh size 3,5 inch.

scholarly journals PENGEMBANGAN LAMPU BAWAH AIR SEBAGAI ALAT BANTU PADA BAGAN TANCAP DI DESA TAMBAK LEKOK KECAMATAN LEKOK PASURUAN

2016 ◽  
Vol 9 (1) ◽  
pp. 7
Author(s):  
F Fuad ◽  
S Sukandar ◽  
Alfan Jauhari
Keyword(s):  
Fishing Gear ◽  
Total Catch ◽  
Fish Catch ◽  
To Come ◽  
Almost All

<p><em>DEVELOPMENT OF UNDER WATER LAMP AS A TOOL TO LIFT NET IN TAMBAK LEKOK VILLAGE PASURUAN</em></p><p><em><br /></em></p><p><em>Bagan is one type of fishing gear that uses light to collect fish. The lights are expected to stimulate the fish to come and stay around the light and than arrested with net. The use of light for fishing is growing rapidly, almost all fishing gear to use light as a tool for collecting fish. Application of this technology aims to increase fish catch fishermen in District Lekok through the application of technology underwater lamp with LED. Underwater lamp applied to the bagan tancap with a certain intensity and color to find the intensity of light and color that give the best catches. Best catches in the light of 450 lux is capable of delivering the highest total catch of 254 kg, it is supported by the values of illumination of 1.5 lux at a distance of 5 m. Types of fish that were caught on as much as 23 step chart types where the type of Stolephorus spp, Selaroides spp, Leiognathus spp, Loligo sp, Rastrelliger spp is a type of fish that always caught each fishing operation.</em></p><p> </p><p><strong>Keywords</strong>:<em> auxilary, development, lamp, Lekok, lift net </em></p><p align="center"><strong> </strong></p><p align="center"><strong>ABSTRAK</strong></p><p align="center"><strong> </strong></p><p><em>Bagan merupakan salah satu jenis alat tangkap yang menggunakan lampu sebagai alat bantu pengunpul ikan. Cahaya lampu diharapkan </em><em>dapat merangsang ikan untuk datang dan berkumpul disekitar sumber cahaya sampai pada suatu catchable area tertentu, lalu penangkapan dilakukan dengan alat jaring maupun pancing. Penggunaan lampu untuk penangkapan ikan saat ini berkembang pesat, hampir semua alat tangkap menggunakan lampu sebagai alat bantu pengumpul ikan. </em><em>Aplikasi teknologi ini bertujuan untuk meningkatkan hasil tangkapan ikan nelayan bagan tancap di Kecamatan Lekok melalui penerapan teknologi lampu celup bawah air berbasis lampu LED. Lampu celup bawah air diterapkan pada bagan tancap dengan intensitas dan warna tertentu untuk mencari intensitas cahaya dan warna yang memberikan hasil tangkapan yang terbaik. </em><em>Hasil tangkapan ikan yang terbanyak adalah pada lampu 450 lux yang mampu memberikan total tangkapan terbanyak 254 kg, hal ini didukung dengan nilai nilai illuminasi sebesar 1,5 lux pada jarak 5 m. Jenis ikan yang tertangkap pada bagan tancap sebanyak 23 jenis dimana jenis ikan teri (</em><em>Stolephorus</em><em> spp), ikan selar (Selaroides spp), ikan pepetek (Leiognathus spp ), cumi – cumi (Loligo sp), ikan kembung (Rastrelliger spp) merupakan jenis ikan yang selalu tertangkap disetiap operasi penangkapan.</em> <em></em></p><p> </p><p><strong>Kata kunci</strong>: a<em>lat bantu, bagan tancap, lampu, Lekok, pengembangan</em></p>

PEMANFAATAN ALAT BANTU RUMPON ELEKTRONIK TERHADAP PENINGKATAN HASIL TANGKAPAN PADA ALAT TANGKAP GILL NET DI WILAYAH PESISIR KAB. BULUKUMBA

2021 ◽  
Vol 4 (1) ◽  
pp. 91-104
Author(s):  
Rahmat Bin Aburaera Sileh ◽  
Danial Sultan ◽  
Ihsan Ihsan
Keyword(s):  
Data Collection ◽  
Deep Sea ◽  
Sustainable Management ◽  
Management Strategy ◽  
Fishing Gear ◽  
Total Catch ◽  
Community Based ◽  
Shallow Marine ◽  
Fishing Trip ◽  
Gill Net

The purpose of this study was to determine the yield and type of catch, the comparison of the number of catches and the efforts to manage electronic FADs on Gill Net fishing gear. This research was conducted in Bulukumba waters from February to March 2017. Data collection was carried out by direct observation of fishermen in Bulukumba waters. The samples used in this study were FADs installed by fishermen in the waters of Bulukumba as many as 20 locations. Based on the research results, fish catches with electronic FADs ranged from 98 to 131 fish per fishing trip with a total catch of 2,324 fish. Meanwhile, the usual FAD catches ranged from 51 to 84 fish per fishing trip with a total catch of 1,313 fish and the highest type of fish was selar, followed by male mackerel, Selar bentong, white Kuwe, Layang, Barracuda, selangat and Mata goyang. The ratio between the catch and the use of electronic FADs was 64%, while the regular FADs were 36%. Considering that FADs are an effective tool in collecting fish, a sustainable management strategy is needed, including by (1) community based management, (2) limiting fishing efforts, (3) stopping the addition of shallow marine FADs. , (4) use of fishing gear with large mesh sizes and (5) prioritize the use of deep sea FADs.

scholarly journals Selectivity of Gillnet to Catch Silver Pomfret (Pampus argenteus) in Pangandaran Waters, Indonesia

2021 ◽  
pp. 7-14
Author(s):  
Izza Mahdiana Apriliani ◽  
Herman Hamdani ◽  
Yuniar Mulyani ◽  
Heti Herawati ◽  
Dear Frans Lyandre Simanjorang
Keyword(s):  
Coastal Waters ◽  
Length Distribution ◽  
Fork Length ◽  
Mesh Size ◽  
Primary Data ◽  
Fishing Gear ◽  
West Java ◽  
Class Interval ◽  
Pampus Argenteus ◽  
Silver Pomfret

The purpose of this research was to determine the most selective mesh size of gillnet fishing gear for Pampus argenteus in coastal waters of Pangandaran Regency, West Java. Research on the selectivity of gillnet fishing gear was carried out in the coastal waters of Pangandaran, West Java Province, from August 2018 to January 2019. The method used in this research is experimental fishing, namely operating gillnet fishing gear directly in the fishing area with fishermen. The primary data collected was the measurement of the catch (fish weight, number, fork length, how the fish was caught, circumference (girth opercullum, maximum body girth). Meanwhile, the secondary data collected were supporting data from the Pangandaran District Fisheries and Marine Service, and literature study. In determining the sampling, the method used is the purposive sampling method. The operation of gillnets using 4.5 inches obtained a higher proportion of main catch (75%) than gillnets with a mesh size of 5 inches (44%). Gillnet with a mesh size of 4.5 inches, the silver pomfret caught was distributed between 17-22 cm in size with the highest mode in the 19 cm fork length. Unlike the gillnet fishing gear with a mesh size of 5 inches, the silver pomfret caught was distributed in the fork length range of 17-25 cm with the highest mode in the length class 19 cm fork length. mesh size 4.5 inches has a hanging ratio value of 0.51. Meanwhile, the 5 inch mesh size has a hanging ratio value of 0.54. Based on the length distribution, gillnets with a mesh size of 5 inches were more dominant in catching silver pomfret in a larger size class interval than gillnets with a mesh size of 4,5 inches. Based on the L50 value, both selective gillnets caught more fish at 50% second chance. The selectivity curve shows that gillnet fishing gear with a mesh size of 5 inches has more selective results than gillnets with a mesh size of 4.5 inches. 

scholarly journals KARAKTERISTIK PERIKANAN PUKAT CINCIN PELAGIS BESAR DI PERAIRAN SAMUDRA HINDIA (WPPNRI 572 DAN 573)

2020 ◽  
Vol 26 (1) ◽  
pp. 37
Author(s):  
Irwan Jatmiko ◽  
Suciadi Catur Nugroho ◽  
Zulkarnaen Fahmi
Keyword(s):  
Mesh Size ◽  
Yellowfin Tuna ◽  
Purse Seine ◽  
Fish Length ◽  
Fishing Gear ◽  
Skipjack Tuna ◽  
Commercial Species ◽  
First Maturity ◽  
Immature Fish ◽  
Purse Seine Fishery

Pukat cincin merupakan salah satu jenis alat penangkapan ikan yang digunakan oleh nelayan di Indonesia untuk menangkap ikan pelagis termasuk tuna dan cakalang. Cakalang dan madidihang/tuna sirip kuning merupakan komoditas perikanan penting di Indonesia untuk kebutuhan pasar domistik dan ekspor. Penelitian ini bertujuan untuk mengetahui karakteristik alat tangkap pukat cincin pelagis besar terutama yang menangkap cakalang dan madidihang di perairan WPPNRI 572 dan 573 (Samudra Hindia). Pengumpulan data dilakukan selama tiga tahun dari 2016-2018 di 18 pelabuhan perikanan yang armadanya melakukan aktivitas penangkapan di perairan WPPNRI 572 dan 573. Indikasi proporsi ikan yang sudah dan belum matang gonad dihitung dengan membandingkan ukuran ikan dengan ukuran pertama kali matang gonad (Lm). Hasil penelitian menunjukkan bahwa alat tangkap pukat cincin sangat dominan dalam mengeksploitasi sumber daya cakalang dan madidihang dengan proporsi mencapai 95% di WPPNRI 572 dan 66% di WPPNRI 573. Kebanyakan ikan yang tertangkap didominasi oleh ikan yang belum matang gonad dengan proporsi sebesar 67% untuk cakalang dan 94% untuk madidihang. Hasil analisis menunjukkan bahwa pukat cincin tidak termasuk alat yang selektif untuk menangkap ikan madidihang. Selanjutnya untuk target ikan cakalang, ukuran mata jaring harus diperbesar untuk mencegah tertangkapnya ikan yang belum matang gonad.Purse seine is one of dominant fishing gear used to catch pelagic species include skipjack and yellowfin tuna, two commercial species in Indonesia’s marine waters. This research aimed to analyze characteristic of purse seine fishery focusing on skipjack and yellowfin tuna within FMA 572 and 573. All the catch-effort data was collected from 18 fishing ports during the period of 2016-2018. All the vessels (purse seiners) were known to be actively fished within FMA 572 and 573. Proportion of mature and immature fish were calculated by comparing the fish length with its length at first maturity (Lm). The results showed that purse seine was a significantly gear to catch skipjack tuna and yellowfin tuna with proportion of 95% in FMA 572, and 66% in FMA 573, respectively. Most of the catch were dominated by immature fish with proportion of 67% for skipjack tuna and 94% for yellowfin tuna. The study concluded that purse seine is not recommended to exploit yellowfin tuna. Futhermore for targeting skipjack tuna, mesh-size of the net need to be in creased, allowing immature fish to escape from the gear that maintain sustainability.

scholarly journals Fishermen Social Movements in West Sumatra: Issues, Actors, and Tactics of the Movement

2020 ◽  
Vol 8 (1) ◽  
pp. 14-29
Author(s):  
Dwi Retno Hapsari ◽  
Rilus A Kinseng ◽  
Sarwititi Sarwoprasodjo ◽  
Asnika Putri Simanjuntak ◽  
Khairil Anam ◽  
...  
Keyword(s):  
Social Movements ◽  
Social Movement ◽  
Mesh Size ◽  
Qualitative Approach ◽  
The Other ◽  
Main Issue ◽  
Fishing Gear ◽  
West Sumatra ◽  
The City

The objectives of this study are to examine the main issue that provoke social movement of fishermen in West Sumatra, to identify the related actors, and to analyze the advocacy strategy carried out by fishermen. This research was conducted in July 2019 and took place in two locations, namely the City of Padang and West Pasaman Regency. The study used qualitative approach. From this study, it is revealed that the main issue that provoke social movements in West Sumatra was the issue of Regulation No. 71 of 2016 by the Minister of Maritime Affairs and Fisheries related to the prohibition of certain fishing gear. This regulation prohibits the use of 4 mm mesh size of the net and the use of lamps in operating the liftnet which reaches up to 25-30 thousand watts of power. This regulation has created a huge burden to fisherman’s work. The Other issue that is also triggering the movement was the arrestment of 6 fishing boats on June 11, 2016. Meanwhile, the main actors who are directly related to this movement are fishermen who are using liftnet (bagan). These actors can be divided into two main categories, namely movers and "participants". The main tactic used in social movements was demonstration.

scholarly journals Catching Technology of Fish Maw Snapper’s: Case Study of the KMN Nur Aqila07 Fishing Boat in Kumbe Village, Malind District, Merauke Regency, Papua

2021 ◽  
Vol 328 ◽  
pp. 08011
Author(s):  
Sajriawati Sajriawati
Keyword(s):  
Data Collection ◽  
Mesh Size ◽  
Fishing Gear ◽  
The Sun ◽  
Running Water ◽  
Gill Nets ◽  
Weight Range ◽  
Fishing Boat ◽  
Gill Net

The purpose of this study was to determine the fishing technology used by fishermen in Merauke to catch snapper and post-harvest handling of fish maw snapper. This research was conducted in January 2021 in Kumbe Village, Malind District. Data collection was carried out by interviewing fishermen on the fishing boat KMN Nur Aqila07. The results showed that the fishing boat KMN Nur Aqila07 has a weight specification of 30 GT. The main fishing gear is a drift gill net with a length of 50 meters with a width of 2 meters with a mesh size of 7.5 inches. The pulley machine is used to help pull the gill nets when they want to pull fishing gear (hauling). Fish maw of snapper is removed manually using a knife, then cleaned with running water and then dried in the sun to dry. Fish maw is sold dry. The highest price for fish maw is in the weight range of 150 grams which can reach Rp. 22,500,000 per kg, while the lowest price is in the weight range of less than 50 grams, which is Rp. 4,500,000 per kg.

scholarly journals PENGARUH PENGGUNAAN LAMPU BAWAH AIR (UNDERWATER LAMP) TERHADAP HASIL TANGKAPAN BAGAN PERAHU (BOAT LIFT NET) DI PELABUHAN PERIKANAN NUSANTARA (PPN) KARANGANTU KOTA SERANG (Effect of Underwater Lamp Usage on Boat Lift Net Fishing Catch at Karangantu Fishing Port Serang City)

2018 ◽  
Vol 14 (1) ◽  
pp. 36
Author(s):  
Aditya Nuraga ◽  
Bogi Budi Jayanto ◽  
Indradi Setiyanto
Keyword(s):  
Pelagic Fish ◽  
Fishing Gear ◽  
Total Catch ◽  
Small Pelagic Fish ◽  
Positive Phototaxis ◽  
The Difference ◽  
Lepturacanthus Savala

Bagan perahu merupakan salah satu jenis alat tangkap di PPN Karangantu yang beroperasi pada malam hari. Bagan perahu menarik ikan target tangkapan yaitu ikan pelagis kecil fototaksis positif menggunakan atraktor cahaya berupa lampu. Salah satu kendala nelayan bagan perahu adalah pencahayaan lampu mengalami pembiasan. Penggunaan lampu bawah air bertujuan untuk mengurangi pembiasan. Tujuan dari penelitian ini adalah mengetahui pengaruh penggunaan lampu bawah air terhadap hasil tangkapan bagan perahu dan mengetahui komposisi hasil tangkapan bagan perahu dengan dan tanpa lampu bawah air. Penelitian ini dilakukan selama 10 trip menggunakan metode experimental fishing. Selisih berat total hasil tangkapan antara bagan perahu dengan dan tanpa lampu bawah air pada trip 1 sebesar 33,4 kg, trip 2 sebesar 38,9 kg, trip 3 sebesar 31,1 kg, trip 4 sebesar 41,1 kg, trip 5 sebesar 28,8 kg, trip 6 sebesar 30,5 kg, trip 7 sebesar 35,4 kg, trip 8 sebesar 34,3 kg, trip 9 sebesar 38,7 kg dan trip 10 sebesar 31,6 kg sehingga menunjukkan hasil tangkapan lebih banyak bagan perahu dengan lampu bawah air. Hasil tangkapan utama bagan perahu adalah ikan Teri (Stolephorus sp.) dan Cumi-cumi (Loligo sp.). Hasil tangkapan sampingan bagan perahu antara lain ikan Petek (Leiognathus sp.), Tembang (Sardinella sp.), Lemuru (Amblygaster sirm), Selar Kuning (Selaroides leptolepi) dan Layur (Lepturacanthus savala). Kesimpulan yang dapat diambil yaitu terdapat pengaruh antara lampu bawah air dengan hasil tangkapan pada bagan perahu. Boat lift net is one type of fishing gear at PPN Karangantu which operates at night. Boat lift net attracts the target catch fish, the small pelagic fish is positive phototaxis using a light attractor in the form of a lamp. One of the constraints of fishermen on the boat chart is that the lighting has experienced refraction. Underwater lamp aims to reduce refraction.The purpose of this research is to know the effect of underwater lamp usage on boat lift net fishing catch and to know the composition of boat lift net with and without using underwater lamp. This research was conducted for 10 trips using experimental fishing methods. The difference in total catch of boat lift net with and without underwater lamp on trip 1 is 33,4 kg, trip 2 is 38,9 kg, trip 3 is 31,1 kg, trip 4 is 41,1 kg, trip 5 is 28,8 kg, trip 6 is 30,5 kg, trip 7 is 35,4 kg, trip 8 is 34,3 kg, trip 9 is 38,7 kg and trip 10 is 31,6 kg so it shows the catch is more the boat lift net with underwater lamp. Fish targets of the boat lift net are Anchovy (Stolephorus sp.) and Cuttlefish (Loligo sp.). The bycatches of boat lift net are Pony fish (Leiognathus sp.), Fringescale sardinella (Sardinella sp.), Indian sardinella (Amblygaster sirm), Trevally (Selaroides leptolepi) and Hairtail fish (Lepturacanthus savala). The conclusion that can be drawn that there is an influence between underwater lamp and catches on the boat lift net.

Assessment of fishing gear and catch rate in Oguta Lake, south Eastern Nigeria

2018 ◽  
Vol 26 (1) ◽  
pp. 1-9
Author(s):  
G. Adaka ◽  
C. Ogueri ◽  
D. Nwaka ◽  
D. Njoku ◽  
A. Nlewadim
Keyword(s):  
Mesh Size ◽  
Catch Rate ◽  
Average Weight ◽  
Fishing Gear ◽  
Gill Nets ◽  
Accurate Picture ◽  
Daily Record ◽  
Over Exploitation ◽  
The Cost ◽  
Percentage Abundance

This study was carried out in Oguta Lake, Imo State, Nigeria, from January, 2012 to December, 2013 at five stations (Onu Utu, Okposha, Ogbe Hausa, Osemotor and Ede Ngwugwu) to ascertain the percentage abundance and catch rate of gear and craft. The average weight of fish caught per canoe per day ranged between 3.2 kg for Basket and Drum traps to 47.1 kg for boat seine net. The gill nets ranged between 6.0 to 13.0kg per canoe per day with mean weight of 8.60±2.91kg, the cast net had values ranging from 1.0 to 7.0 kg with a mean weight of 4.3±2.49 kg. Lift net yielded an average of 3.4 kg per canoe per day. Gill nets were the main gear used by fishers, followed by long lines and cast nets at the lake. It is important to locate all the fishers operating in the lake and daily record of catches be collected for a more accurate picture of the total catch and fish species. Mesh size regulation prevent over exploitation of young fish, before they attain sexual maturity. It is recommended that the cost of procuring fishing inputs such as fishing gear and crafts and safety kits should be monitored by government and be subsidized for the fishers.Key words: drum trap, crafts, catch, exploitation, Oguta, mesh size, trap

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