Untuk meningkatkan produktivitas penangkapan tuna, beberapa tahun terakhir ini nelayan dan pengusaha menggunakan alat bantu rumpon laut dalam sebagai alat pengumpul ikan dilakukan penangkapan. Penggunaan rumpon berkembang sangat pesat sehingga timbul permasalahan baik terkait dengan kelestarian sumberdaya tuna dan konflik sosial ekonomi di kalangan nelayan. Tujuan kajian ini adalah untuk mengetahui isue permasalahan terkait rumpon saat ini dan bagaimana solusi pengelolaannya sehingga penggunaan rumpon tidak mempengaruhi keberlanjutan perikanan tuna. Data dan informasi utama yang digunakan dalam kajian ini berasal dari hasil penelitian di lapangan dan diskusi melalui workshop dan Focus Group Discussion (FGD). Tipe rumpon laut dalam yang digunakan di perairan Indonesia adalah rumpon berjangkar, yang dipasang menetap terhubung dengan dasar perairan, menggunakan jangkar atau pemberat dari beton dihubungkan dengan tali-temali ke pelampung (pontoon, gabus, rakit), yang dilengkapi dengan bahan pemikat ikan dari daun kelapa atau nipah. Beberapa jenis alat tangkap yang dioperasikan di sekitar rumpon antara lain pukat cincin, pancing ulur, pancing tonda, huhate, dan jaring insang. Hasil kajian resiko menunjukkan jenis alat tangkap yang sesuai dioperasikan di sekitar rumpon adalah pancing ulur dan pancing tonda. Pukat cincin memiliki resiko tertinggi karena banyak menangkap jenis ikan tuna yang berukuran kecil khususnya yellowfin dan bigeye tuna sebagai hasil tangkapan sampingan. Jenis alat tangkap pancing ulur lapisan dalam sangat sesuai kriteria ramah lingkungan untuk menangkap tuna di sekitar rumpon. Beberapa isu permasalahan muncul setelah rumpon berkembang di nelayan antara lain jumlah rumpon sulit diketahui, banyak ikan tuna berukuran kecil tertangkap sebagai hasil tangkapan sampingan dan perubahan tingkah laku ikan karena adanya “perangkap ekologi”. Beberapa rekomendasi kegiatan yang perlu dilakukan antara lain: perlu adanya penertiban pemasangan rumpon dengan melakukan pendaftaran ulang rumpon yang terpasang, jarak pemasangan rumpon harus mengacu pada jarak terdekat antar rumpon yang telah ditetapkan yaitu minimal 10 nautical mile, pemasangan rumpon sebaiknya tidak dilakukan di wilayah perairan perbatasan antar negara.During recent years fishers were intensively use deep sea FADs in their tuna fishery to attract tunas in their fishing operation for increasing its productivity. The used of FADs has rapidly developed and now starting to deem not only the sustainability of tuna resources but also triger socio economic frictions among fishers. The purpose of this study to find problem issues related to the current status of FAD and how the solution of the good management for impact on the sustainability of tuna fisheries around FAD. Main data and information are used in this study from in the field observation and result of workshop and Focus Group Discussion (FGD). A type of deep sea FADs deployed in Indonesian waters are moored or anchored FADs which occupy a fixed location and attach to the sea bottom using a weight such as an anchored or concrete block, which connected by long ropes to the floating object (Poonton, stereofoam or raft) that compliment with coconut or nipah leaves as fish lure. Several types of fishing gears operated arround FADs are purse seine, deep hand line, troll line, pole and line, and gill net. Risk assessment analysis showed that suitable gears for FADs fishing were deep sea hand line (dHL) and troll line. Purse siene was a gear with high risk score due to its operation not only caught small size of yellow fin and big eye tuna but also many by-catches. Several issues were raised after recent massive deployment of FADs among fishers concerning on numbers and license of FADs, high number on catches of juvenile tuna as by-catches. Furthermore FADS also believe has affect to the changes of tuna behaviour as highly migratory species which been ecologically trapped by FADs. This study provides current FADs management at national and regional level and some recommendations could be considered to ensure the sustainability of tuna utilization, as following: for the compliance using FAD need to re-regrestration for deployed FAD, fishermen should compliance for deploying FAD with minimum distance is 10 nautical miles among FAD as mentioned in regulation, suggested not deploy FAD in border area waters, deep hand line (dHL) is suggested as suitable fishing gear for catching tuna around FAD.
ABTRACTThis study was conducted in western Sumatera and since October 2013 to June 2014. The sampling locations in Banda Aceh and Sibolga-North Sumatera which were the largest base of fisheries in western Sumatera region. Shark landing recorded by enumerators was used as sampling data daily. This research aim to describ sex ratio, size composition, catch composition of sharks, and length at first maturity. In Banda Aceh, the sharks as target fish collected by sorting the bycatch from tuna longlines and tuna handlines. In Sibolga, sharks is bycatch from fish net, bottom gillnet and purse seine. Overall, there were 20 species of shark caught in west Indian Ocean and landed at those fish landing sites, dominated by Spot tail shark (23%) and Silky shark (13%), whereas Hammerhead shark contributed about 10% and Oceanic whitetip shark was only less than 1%. Almost of Spot tail shark, Silky shark, and Scalloped hammerhead that caught in that area were immature, while for the almost part of Tiger shark and Pelagic thresher were matured. The sex ratios for Spot tail shark, Silky shark, Tiger shark, Pelagic thresher, and Scalloped hammerhead caught and landed at Lampulo and Sibolga fish landing sites were not balance. The length at first maturity for Spot tail shark was Lm=87,1 cm and Lm = 213,2 cm total length for Tiger shark.
The use of anchored fish aggregating devices (a-FADs) in the Indonesia-Indian Ocean has increased rapidly. Since 2004, the Government of Indonesia has issued various FAD related fisheries regulations; however, its implementation was difficult, largely due to the lack of such information. As an endeavor to improve the management of tuna fisheries associated with FADs in this area, an Indonesia–Australia research collaboration project conducted a port sampling program from November 2013 to December 2015 in three key fishing ports in the western Indonesia, i.e., Pelabuhanratu (West Jawa), Muara Padang (West Sumatera), and Bungus (West Sumatera). Data were collected through daily enumeration and interviews with skippers, which consisted of catch, trip duration, biological data, and number of FADs visited. These data were analyzed to estimate catch rate, success rate, and length frequency distribution. The success rate of hand line/trolling line (HL/TR) at Muara Padang showed much lower than that at Pelabuhanratu. This may be due to more a-FADs or higher density in the Padang region, competing with purse seine (PS) boats operating in the same area, than those in the Pelabuhanratu region. The species composition caught by HL/TR and PS associated a-FADs in Indonesian FMA 572 and 573 include skipjack (SKJ, Katsuwonus pelamis), yellowfin (YFT, Thunnus albacares) and bigeye tuna (BET, T. obesus). A large proportion of the SKJ, YFT and BET caught at both Indonesian FMA 572 and 573 were juvenile fish, below the reported length at maturity (Lm) for those species.
Beberapa ienis ikan demersal mempunyai nilei ekonomis penting seperti kakap dan kerapu. Rawai dasar sampai saat ini dianggep sebagai alat tangkap yang peling efektif digunakan untuk menangkap ikan demersal. Penelitian tentang pengaruh ukuran mata pancing rawai dasar terhadap hasil tangkapan telah dilakukan di perairan sebelah Timur Bali mulai bulan Mei 1994 sampai dengan Januari 1995.
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.
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