DEEP-WATER EXPLORATORY BOTTOM LONG LINING IN THE WATERS OF THE ARAFURA SEA

Bottom long line fisheries in the continental shelf area of the Arafura Sea has have practised and developed since the last two decades. But bottom long lining in the slope area seemed to be unusual fishing operation for most Indonesian fishers as this fishing activily facing a relatively higher rbks of fishing gear lost

SEBARAN DAERAH PENANGKAPAN IKAN TUNA DI SAMUDERA HINDIA

Tuna merupakan komoditas perikanan laut yang sangat penting karena dapat menyumbang perolehan devisa, Jenis ikan ini memlliki penyebaran yang sangat luas dan biaaanya melakukan ruaya jauh, Di Indonesia penangkapan ikan tuna dilakukan secara komersial mulai tahun 1970-an yang dirintis oleh PT Perikanan Samudera Beear. Saat ini banyak perusahaan perikanan yang melakukan penangkapan tunakhusuanya dengan alat tangkap longline

ANALISIS UPAYA PENANGKAPAN IKAN CAKALANG PADA OPERASI PUKAT CINCIN DI PERAIRAN PULAU NIAS YANG DIDARATKAN DI PPN SIBOLGA

Penelitian ini ingin mengetahui tingkat potensi lestari terhadap jumlah (MSY), upaya penangkapan dan tingkat pemanfaatan lestari ikan cakalang (Katsuwonus pelamis) di PPN Sibolga tahun 2017 sampai dengan 2021. Metode yang digunakan model Schaefer atau model Fox. Hasil tangkapan per upaya menunjukan fluktuasi penurunan CPUE tiap bulan nya 0,0282 ton /trip. Hubungan antara CPUE dan effort menghasilkan persamaan linier y= -0,0174 x +9,95, jika tidak ada effort, maka potensi ikan cakalang sebesar 9,95 ton/trip dan setiap penambahan 1 trip akan menyebabkan penurunan CPUE sebesar 0,0174 ton/trip. Hasil analisis MSY model Schafer di dapatkan MSY 1428,11 ton/bulan, upaya penangkapan lestari sebanyak 287 trip/bulan dan tingkat pemanfaatan sebesar 98%. Sedangkan hasil analisis MSY model Fox MSY 1198,66 ton/bulan, upaya penangkapan lestari sebanyak 238 trip/bulan, dan tingkat pemanfaatan sebesar 120%, sehingga kondisi sumber daya ikan cakalang di PPN Sibolga pada saat ini mengalami status Over-Exploite

ESTIMASI DAYA TARIK TALI MINI HAULER UNTUK DITERAPKAN PADA PERIKANAN PANCING ULUR TUNA DI SAMUDERA HINDIA SELATAN JAWA

Berat tuna hasil tangkapan nelayan pancing ulur di perairan Selatan Jawa dapat mencapai 100 kg/ekor, dan sampai saat ini tali pancing ulur ditarik secara manual. Kondisi ini beresiko bagi nelayan seperti kecelakaan atau sakit tulang belakang (back pain). Untuk mengurangi resiko tersebut maka digunakan mini hauler untuk menarik tali pancing ulur sehingga memudahkan menaikan hasil tangkapan ke atas kapal. Mini hauler disesuaikan dengan beban yang akan ditarik. Beban mini hauler berasal dari daya dorong tuna yang berenang pada kondisi kecepatan spontan ketika tuna berusaha melepaskan diri dari jerat pancing dan beban yang timbul dari rangkaian pancing ulur. Perhitungan dengan menggunakan persamaan archimedes dan persamaan bernoulli menunjukan bahwa daya dorong yang dikeluarkan tuna berukuran 190cmFL untuk berenang dalam kondisi burst speed sebesar 1.746 newton. Total beban terbesar ketika tuna berenang vertikal membentuk sudut 1800 terhadap rangkaian pancing ulur yaitu sebesar 1.763,90 newton dengan tenaga  sebesar 8,82 Kw setara 11,99 Hp.Tunas caught by hand line fishers can reach 100 kg in weight per individual, however, they still use manual technology to pull out the line from waters. This condition could risk the fisherman’s safety such as accident or back pain. To reduce those risks that could be happened, it required tools such as mini hauler to help fisherman pull out the fish line so fish could be unload much easier. Design of mini hauler were adjusted to the target species. Mini hauler’s load comes from tuna swimming power at burst speed condition and the load arising from the series of fishing line itself. Using Archimedes and Bernoulli equations, the results shown that the force used by tunas at size of 190 cmFL to swim at the burst speed condition was 1,746 Newton. The highest total load when the fish swims vertically down to form the angle of 1800 to fising line is 1763,90 newton, equal to 8.82 kw≈11,99 horse power

SEBARAN DAERAH PENANGKAPAN IKAN TUNA DI SAMUDERA HINDIA

Tuna merupakan komoditas perikanan laut yang sangat penting karena dapat menyumbang perolehan devisa, Jenis ikan ini memlliki penyebaran yang sangat luas dan biaaanya melakukan ruaya jauh, Di Indonesia penangkapan ikan tuna dilakukan secara komersial mulai tahun 1970-an yang dirintis oleh PT Perikanan Samudera Beear. Saat ini banyak perusahaan perikanan yang melakukan penangkapan tunakhusuanya dengan alat tangkap longline

PENGARUH ILUMINASI ATRAKTOR CAHAYA TERHADAP HASIL TANGKAPAN IKAN PADA BAGAN APUNG PELABUHAN RATU

Atraktor cahaya sebagai alat bantu penangkapan banyak digunakan untuk mengumpulkan ikan pada alat tangkap bagan apung. Tiga macam atraktor cahaya, yaitu petromaks minyak tanah (dengan iluminasi maksimal 80 lux), petromaks gas (dengan iluminasi maksimal 60 lux), dan lampu genset (dengan iluminasi maksimal 500 lux) digunakan pada bagan apung di Palabuhanratu. Penelitian ini bertujuan untuk mengetahui pengaruh perbedaan iluminasi cahaya pada ketiga macam sumber cahaya tersebut terhadap hasil tangkapan bagan apung. Metode yang digunakan adalah eksperimen penangkapan ikan dengan menggunakan tiga jenis atraktor cahaya pada bagan apung. Hasil penelitian menunjukkan perbedaan iluminasi atraktor cahaya pada bagan apung berpengaruh terhadap komposisi hasil tangkapan. Hasil tangkapan bagan pada saat menggunakan atraktor cahaya petromaks minyak tanah (80 lux) didominasi oleh ikan layur (Trichiurus spp.) yang mencapai lebih dari 50%, petromaks gas (60 lux) didominasi oleh ikan layur (Trichiurus spp.) dan cumi-cumi (Loligo spp.) sedangkan untuk atraktor lampu genset (500 lux) didominasi oleh layur dan cumi-cumi.   Light attractor has been used as a fishing device to gather fish schooling on lift net. There are three types of light attractors i.e. kerosene pressure lamp, gas pressure lamp and genset lamp used by Palabuhanratu’s lift net. The aim of this research is to investigate the effect of those light attractors on the lift net catches. The experimental fishing method was used. The results show that illumination produced by genset lamp was higher (500 lux) than the two other light attractors at all observation positions with maximum illumination obtained of 80 lux for kerosene pressure lamp and 60 lux for gas pressure lamp. Catch of lift net when using kerosene pressure lamp attractor (80 lux) was dominated by hairtail fish (Trichiurus spp.) that reaches more than 50%, gas kerosene lamps attractor (60 lux) was dominated by fish Layur (Trichiurus spp.) and squid (Loligo spp.) while for the attractor generator light (500 lux) was dominated either by Layur and squid

Design of An Automatic Temperature Recorder for Fishery Vessels Using Internet of Things Technology

Fishery products, especially capture fisheries, must be safe and high-quality. The treatment of captured fish from capture to consumption is crucial to maintaining its quality. Temperature impacts fish quality. Fish putrefaction can be prevented at a specific temperature. Maintaining optimal fish quality requires temperature monitoring at the holding hatch of fish captured on board. Indonesia requires hatches with fish storage to have automatic temperature recorders and monitors. Inspections by authorities who issued certifications of acceptable fish handling practices found many breaches on Indonesian fishing vessels without automatic temperature monitoring systems. Indonesian fishery exports to the EU have been rejected due to the lack of automatic temperature recording systems on fishing vessels. Existing automatic temperature recording equipment for fishing vessels does not meet technical and legal requirements.  The lack of autonomous temperature monitoring devices on fishing vessels was solved via design thinking in an exploratory study. Thus, fishing vessel temperature recording devices were designed using Internet of Things technology. Literature is utilized to choose resources. Hatch temperature recorder, MAX 31865 module, and PT100 thermocouple sensor use ESP 32 as a microprocessor. Raspberry Pi4 controls, displays, and stores data. This fish hatch temperature recorder has a GPS module for coordinates. This utility manages display and storage with Home Assistant software. Commercial low-temperature recorders are utilized for comparison testing. Before calibration, the pesuotokapi tool had a variance coefficient of 9.39%, whereas the comparison tool had 12.09%. The pesuotokapi tool has a coefficient of variation of 11.96% after calibration, whereas the comparison tool had 13.28%. The pesuotokapi tool regularly yields a lower coefficient of variation than the comparison tool. This shows that the pesuotokapi tool generates data with less divergence from the average recorded temperature than the comparison tool. Pesuotokapi devices regularly outperform comparator devices in temperature before calibration, improving fish hold quality

The MEKANISASI BAGAN TANCAP MENGGUNAKAN ROLLER PENGANGKAT JARING DI PANGANDARAN, JAWA BARAT

Pangandaran is located in the southern coast of the Java Island. Some of Pangandaran fishers operate lift net (bagan) to catch fish and shrimp. During hauling process, the net is lifted manually using a roller that potentially harm the fishers. The purpose of this study was to design a mechanical roller that applicable for lift net. The analysis of design requirement, such as calculation of torque, horse power, and reduction power with gear mechanism for operating the roller were applied in this research. The results showed that the net lifting operation required 4.8 HP or 3.6 KW of diesel engine to power a hydraulic pump. For the maximum load, when the net is fully loaded with fish, the operation required 67.91 HP or 50.64 KW. It means power from the diesel motor was not enough to support at maximum load. Therefore, a gear mechanism with a ratio of 1:14 was applied. However, this method reduces the angular speed of the gear which leads to reduction on net pulling speed. Keywords: Lift net, hydraulic, horse power, power, and lifnet rolle

Design of Solar Powered Cooling Engine For Fishing Vessel ≤ 5 GT

- The fishermen in Sendang Biru, Malang, East Java Province, Indonesia, using boat ≤5 GT, specifically an outrigger boat with 10,6 m Length of Overall (LoA), 1,3 m Breadth (B), and 0,7 m Depth (D), have experienced low priced fish catches for many years caused by low quality of fish handling on board. In this research, the researcher overcomes the problem by designing the solar powered cooling engine (SPCE) to maintain the caught fish quality on boat ≤5 GT, especially the boat with outrigger and size as previously mentioned. Meanwhile, the outrigger boat as mentioned above has limited in term of its space and its capacity on board. The research designed the SPCE that fitted to space and capacity of the outrigger boat. The stability of the boat had been analyzed by using IMO resolution on “IMO A.749 (18) Chapter 3”. The result of the analyses showed that the SPCE designed met the IMO criteria applicable to all ships, which has GZ Max 0,492 m at 25.5°, and as the general arrangement of the SPCE on the boat, the SPCE device put in the middle of the boat while in the back part of the boat is fisher working area.