Pub Date : 2019-11-11DOI: 10.29244/jmf.v10i2.30845
R. Ismail, M. Tauviqirrahman, D. Mulyana, Fiki Firdaus, J. Jamari
For design of marine propeller, the energy supply from marine engine to the propeller should be converted to thrust force with minimum losses. Furthermore, the unwanted vibration and cavitation due to the overlooking a detail calculation of the propeller should be prohibited for increasing the fuel efficiency and life-span of the propeller. In the last few decades, most of small and medium sized enterprises (SMEs) focusing their work on ship component industry in Central Java Province Indonesia provide the marine propeller to the ship manufacturer and ship repairmen in some shipyards in northern part of Central Java port. The design of the propeller is never been observed and optimized. The aim of the present work is to redesign the installed propeller on a wooden fishing boat with the new optimized design using B-Series propeller theory approach. The reverse engineering method uses three-dimensional scanner to obtain the geometrical data of the installed ship propeller. The new optimized propeller design is obtained from free software calculation based on the boat and engine specification. The comparison shows that the new optimized propeller design has a wider blade and larger pitch and increases 20% of the open water efficiency of the propeller performance at lower engine rotation. Keywords: B-series design, fishing boat, marine propeller, redesign, optimization
{"title":"Redesigning of 4 (Four) Blades Propeller Installed in a Wooden Fishing Boat in a Ship Yard in Tegal, Central Java Province","authors":"R. Ismail, M. Tauviqirrahman, D. Mulyana, Fiki Firdaus, J. Jamari","doi":"10.29244/jmf.v10i2.30845","DOIUrl":"https://doi.org/10.29244/jmf.v10i2.30845","url":null,"abstract":"For design of marine propeller, the energy supply from marine engine to the propeller should be converted to thrust force with minimum losses. Furthermore, the unwanted vibration and cavitation due to the overlooking a detail calculation of the propeller should be prohibited for increasing the fuel efficiency and life-span of the propeller. In the last few decades, most of small and medium sized enterprises (SMEs) focusing their work on ship component industry in Central Java Province Indonesia provide the marine propeller to the ship manufacturer and ship repairmen in some shipyards in northern part of Central Java port. The design of the propeller is never been observed and optimized. The aim of the present work is to redesign the installed propeller on a wooden fishing boat with the new optimized design using B-Series propeller theory approach. The reverse engineering method uses three-dimensional scanner to obtain the geometrical data of the installed ship propeller. The new optimized propeller design is obtained from free software calculation based on the boat and engine specification. The comparison shows that the new optimized propeller design has a wider blade and larger pitch and increases 20% of the open water efficiency of the propeller performance at lower engine rotation. \u0000Keywords: B-series design, fishing boat, marine propeller, redesign, optimization","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90292751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A fishing operation is a dangerous and high risk activity. Stability of the vessel plays an important role in performing safely and successfully fishing operations. A brand new 30 GT purse seiner, production of a traditional shipyard in Batang Regency, experienced 15o heel after its launch. This condition potentially affects the stability of the vessel. The purpose of the study is to analyze the vessel stability and improve existing stability by adding outriggers. Research was conducted in two phases, data collection in the research site and stability analysed using a naval architecture software. The vessel stability was analyzed in six loading scenarios following the fishing operation process, subsequently the stability was compared against IMO standard. Results show that with the existing design, the vessel does not meet IMO criteria for the most applied scenarios. Next step, outriggers were added in both sides of the vessel model, as an effort to improve its stability. Accordingly, it is revealed that outriggers addition is scientifically proven to improve the stability of the studied vessel. As this research merely focused on the stability improvement, further analysis regarding maneuverability is required given a purse seiner operates encircled fishing gear. Keywords: outrigger, purse seiner, stability
{"title":"MODIFIKASI KAPAL PURSE SEINE 30 GT DENGAN MENAMBAHKAN CADIK UNTUK MENINGKATKAN SURVIVAL OF INTACT STABILITY","authors":"Hasanudin Hasanudin, Totok Yulianto, Rizky Chandra Ariesta","doi":"10.29244/jmf.v10i2.30853","DOIUrl":"https://doi.org/10.29244/jmf.v10i2.30853","url":null,"abstract":"A fishing operation is a dangerous and high risk activity. Stability of the vessel plays an important role in performing safely and successfully fishing operations. A brand new 30 GT purse seiner, production of a traditional shipyard in Batang Regency, experienced 15o heel after its launch. This condition potentially affects the stability of the vessel. The purpose of the study is to analyze the vessel stability and improve existing stability by adding outriggers. Research was conducted in two phases, data collection in the research site and stability analysed using a naval architecture software. The vessel stability was analyzed in six loading scenarios following the fishing operation process, subsequently the stability was compared against IMO standard. Results show that with the existing design, the vessel does not meet IMO criteria for the most applied scenarios. Next step, outriggers were added in both sides of the vessel model, as an effort to improve its stability. Accordingly, it is revealed that outriggers addition is scientifically proven to improve the stability of the studied vessel. As this research merely focused on the stability improvement, further analysis regarding maneuverability is required given a purse seiner operates encircled fishing gear. \u0000Keywords: outrigger, purse seiner, stability","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85589878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-11DOI: 10.29244/jmf.v10i2.30855
Abdul Hamid, Syamsul Kamri
Information regarding the diversity of bycatch from blue swimming crab fishing operations is important in ecosystem-based management and assessment for Marine Stewardship Council (MSC) certification of crab fisheries in Southeast Sulawesi and Indonesia. However, data limitation becomes major challenges. This study aims to specify the types of bycatch caught from blue swimming crab fishing in Lasongko and Kendari Bay Southeast Sulawesi. This research was conducted in March to September 2019. Data was collected from trap and bottom gillnet fishing by using a purposive sampling method on a monthly basis. Bycatch was categorized into two groups, namely economically valuable and discarded, according to the local fishers’ perception. Information was presented both spatially and temporally. The results show that bycatch consists of 66 species including 41 economically valuable and 26 discarded species. Indices of diversity, evenness and dominance of fish were also discussed to describe the ecological conditions. Accordingly, this bycatch composition is able to support the management and assessment of MSC certification of crab fisheries in Southeast Sulawesi. Keywords: bycatch, fish diversity, blue swimming crab fisheries, Southeast Sulawesi.
{"title":"KEANEKARAGAMAN JENIS IKAN HASIL TANGKAPAN SAMPINGAN (BYCATCH) PERIKANAN RAJUNGAN DI TELUK LASONGKO DAN KENDARI SULAWESI TENGGARA","authors":"Abdul Hamid, Syamsul Kamri","doi":"10.29244/jmf.v10i2.30855","DOIUrl":"https://doi.org/10.29244/jmf.v10i2.30855","url":null,"abstract":"Information regarding the diversity of bycatch from blue swimming crab fishing operations is important in ecosystem-based management and assessment for Marine Stewardship Council (MSC) certification of crab fisheries in Southeast Sulawesi and Indonesia. However, data limitation becomes major challenges. This study aims to specify the types of bycatch caught from blue swimming crab fishing in Lasongko and Kendari Bay Southeast Sulawesi. This research was conducted in March to September 2019. Data was collected from trap and bottom gillnet fishing by using a purposive sampling method on a monthly basis. Bycatch was categorized into two groups, namely economically valuable and discarded, according to the local fishers’ perception. Information was presented both spatially and temporally. The results show that bycatch consists of 66 species including 41 economically valuable and 26 discarded species. Indices of diversity, evenness and dominance of fish were also discussed to describe the ecological conditions. Accordingly, this bycatch composition is able to support the management and assessment of MSC certification of crab fisheries in Southeast Sulawesi. \u0000Keywords: bycatch, fish diversity, blue swimming crab fisheries, Southeast Sulawesi.","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79253114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-11DOI: 10.29244/jmf.v10i2.30844
Didin Komarudin, M. Baskoro, Diniah Diniah, B. Murdiyanto, Pipih Suptijah
Agel ropes have lower mechanical properties (breaking strength and elongation) than synthetic fiber ropes. Chitosan coating is expected to improve the mechanical properties of agel ropes. The aims of this study are to investigate the effect of immersion in chitosan on the physical and mechanical properties of agel ropes, and to examine the breaking strength and elongation of coated agel ropes after being soaked in both freshwater and seawater. This experimental study was conducted at the Laboratory of Fishing Gear Technology, Department of Fisheries Resources Utilization IPB University, and Laboratory of Forest Product Engineering, Department of Forest Products IPB University. The experiment involved 3 mm in diameter of two agel ropes incorporating control rope and agel rope soaked in 1% chitosan for 24 hours. The control rope was light brown, stiff, and rough, while the treated rope was darker, less stiff, and smoother. The breaking strength of control and treated rope was significantly different (P<0.05), which in respect constitute 15.06 kgf and 24.54 kgf. The elongation of both ropes were also significantly different (P<0.05), making 10,56% for control and 18,04% for treated rope. Breaking strength of the agel rope decreased by 50% after being immersed for 28 days. Keywords: agel rope, chitosan, breaking strength, elongation
{"title":"KARAKTERISTIK TALI AGEL BERKITOSAN SEBAGAI BAHAN ALAT PENANGKAPAN IKAN","authors":"Didin Komarudin, M. Baskoro, Diniah Diniah, B. Murdiyanto, Pipih Suptijah","doi":"10.29244/jmf.v10i2.30844","DOIUrl":"https://doi.org/10.29244/jmf.v10i2.30844","url":null,"abstract":"Agel ropes have lower mechanical properties (breaking strength and elongation) than synthetic fiber ropes. Chitosan coating is expected to improve the mechanical properties of agel ropes. The aims of this study are to investigate the effect of immersion in chitosan on the physical and mechanical properties of agel ropes, and to examine the breaking strength and elongation of coated agel ropes after being soaked in both freshwater and seawater. This experimental study was conducted at the Laboratory of Fishing Gear Technology, Department of Fisheries Resources Utilization IPB University, and Laboratory of Forest Product Engineering, Department of Forest Products IPB University. The experiment involved 3 mm in diameter of two agel ropes incorporating control rope and agel rope soaked in 1% chitosan for 24 hours. The control rope was light brown, stiff, and rough, while the treated rope was darker, less stiff, and smoother. The breaking strength of control and treated rope was significantly different (P<0.05), which in respect constitute 15.06 kgf and 24.54 kgf. The elongation of both ropes were also significantly different (P<0.05), making 10,56% for control and 18,04% for treated rope. Breaking strength of the agel rope decreased by 50% after being immersed for 28 days. \u0000Keywords: agel rope, chitosan, breaking strength, elongation","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"149 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90335876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-11DOI: 10.29244/jmf.v10i2.30852
Ernani Lubis, A. B. Pane, Khoerul Fatoni
Fishing port plays a vital role in providing fish raw materials (IBB) required for fish processing industries (IPI). The planning and development of IPI at Tasik Agung Rembang Coastal Fishing Port (PPP) rely on information regarding IBB supplies, however little data is available to support the decision. The purpose of this study was to investigate the origin of the IBB in fulfilling IPI demand for Pindang production and assess the IBB actual supplies (type, number, quality). A survey on the availability of IBB was conducted by involving various stakeholders including port officers, fishers, and IPI related entrepreneurs. Data collection consisted of both demand and supplies of IBB, which incorporate types, volume, and quality of fish. The results showed that the total demand for IBB was 824.8 ton/month and consisted of 9 species. However, the existing supplies of IBB only cover 59.5% of it. Keywords: raw materials, pindang, Tasik Agung fishing port
渔港在提供鱼品加工业所需的鱼品原料方面起着至关重要的作用。Tasik Agung Rembang沿海渔港(PPP) IPI的规划和发展依赖于IBB供应的信息，然而，支持这一决策的数据很少。本研究的目的是调查IBB的来源，以满足IPI对品当生产的需求，并评估IBB的实际供应(类型，数量，质量)。通过涉及各种利益相关者，包括港口官员、渔民和与IPI相关的企业家，对IBB的可用性进行了调查。数据收集包括IBB的需求和供应，包括鱼类的种类、数量和质量。结果表明:该地区对IBB的总需求量为824.8 t /月，共有9种;然而，IBB的现有供应量仅占其59.5%。关键词:原材料，品当，塔扎克阿贡渔港
{"title":"KEBUTUHAN IKAN BAHAN BAKU INDUSTRI PINDANG DI PELABUHAN PERIKANAN PANTAI TASIK AGUNG REMBANG","authors":"Ernani Lubis, A. B. Pane, Khoerul Fatoni","doi":"10.29244/jmf.v10i2.30852","DOIUrl":"https://doi.org/10.29244/jmf.v10i2.30852","url":null,"abstract":"Fishing port plays a vital role in providing fish raw materials (IBB) required for fish processing industries (IPI). The planning and development of IPI at Tasik Agung Rembang Coastal Fishing Port (PPP) rely on information regarding IBB supplies, however little data is available to support the decision. The purpose of this study was to investigate the origin of the IBB in fulfilling IPI demand for Pindang production and assess the IBB actual supplies (type, number, quality). A survey on the availability of IBB was conducted by involving various stakeholders including port officers, fishers, and IPI related entrepreneurs. Data collection consisted of both demand and supplies of IBB, which incorporate types, volume, and quality of fish. The results showed that the total demand for IBB was 824.8 ton/month and consisted of 9 species. However, the existing supplies of IBB only cover 59.5% of it. \u0000Keywords: raw materials, pindang, Tasik Agung fishing port","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87861224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.29244/JMF.V10I2.29496
F. Ramdhani, N. Nofrizal, R. Jhonnerie
Tanjung Jabung Barat Regency has a great potential for mantis shrimp (Harpiosquilla raphidea) resources. This commodity is highly valued, as its price range from Rp. 143,600 to 180,700 for each individual. Annually, the total catches constitute 125,000-225,000 individuals, which become one of export commodities to various countries. In Tanjung Jabung barat, the mantis shrimp has been caught by using gillnet with mesh size of 10 cm. Unfortunately, mantis shrimp fishing deal with a significant number of bycatch and discards, which potentially have negative impact on sustainable fisheries resources. Therefore, the purposes of this study was to emphasis on sustainable fishing effort of mantis shrimp and identify the composition and proportion of bycatch and discards. A series of surveys was conducted for collecting the amount of species caught by gillnet during mantis shrimp fishing operation. The result shows that the bycatch and discards dominated the total catches making up to 54.99% (7 species) and 22.69% (7 species) respectively. Mean while, the total of fishing catches for mantis shrimp was 22.32%.Keywords: bycatch, discards, gillnet, mantis shrimp (Harpiosquilla raphidea)
丹戎Jabung Barat reggency具有巨大的螳螂虾资源潜力。这种商品价值很高，因为它的价格从143,600卢比到180,700卢比不等。每年的总捕获量为12.5万- 22.5万条，成为各国的出口商品之一。在Tanjung Jabung barat，螳螂虾是用网目10厘米的刺网捕获的。不幸的是，螳螂虾捕捞处理大量的副渔获物和弃物，这可能对可持续渔业资源产生负面影响。因此，本研究的目的是强调螳螂虾的可持续捕捞努力，并确定副渔获物和丢弃物的组成和比例。本署进行了一系列调查，收集在捕虾作业期间刺网捕获的虾种数目。结果表明，副渔获物和抛弃物分别占总渔获量的54.99%(7种)和22.69%(7种)。同时，螳螂虾的总捕获量为22.32%。关键词:副渔获物，弃物，刺网，螳螂虾
{"title":"STUDI HASIL TANGKAPAN BYCATCH DAN DISCARD PADA PERIKANAN UDANG MANTIS (Harpiosquilla raphidea) MENGGUNAKAN ALAT TANGKAP GILLNET","authors":"F. Ramdhani, N. Nofrizal, R. Jhonnerie","doi":"10.29244/JMF.V10I2.29496","DOIUrl":"https://doi.org/10.29244/JMF.V10I2.29496","url":null,"abstract":"Tanjung Jabung Barat Regency has a great potential for mantis shrimp (Harpiosquilla raphidea) resources. This commodity is highly valued, as its price range from Rp. 143,600 to 180,700 for each individual. Annually, the total catches constitute 125,000-225,000 individuals, which become one of export commodities to various countries. In Tanjung Jabung barat, the mantis shrimp has been caught by using gillnet with mesh size of 10 cm. Unfortunately, mantis shrimp fishing deal with a significant number of bycatch and discards, which potentially have negative impact on sustainable fisheries resources. Therefore, the purposes of this study was to emphasis on sustainable fishing effort of mantis shrimp and identify the composition and proportion of bycatch and discards. A series of surveys was conducted for collecting the amount of species caught by gillnet during mantis shrimp fishing operation. The result shows that the bycatch and discards dominated the total catches making up to 54.99% (7 species) and 22.69% (7 species) respectively. Mean while, the total of fishing catches for mantis shrimp was 22.32%.Keywords: bycatch, discards, gillnet, mantis shrimp (Harpiosquilla raphidea)","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"111 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80584966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.29244/JMF.V10I2.29313
Arif Fadillah, Shanty Manullang, Rizky Irvana
Fishing boats are used in capturing or collecting aquatic resources. As a means of production, the boat should meet various conditions of seaworthiness i.e. good stability, good seakeeping ability and minimum resistance. Those criteria can be identified when the boat size and the hull form are designed. This study investigates the effect of the boat dimension and the hull form on the stability, resistance and seekeeping ability. Various sizes and hull shapes of a 20 GT fishing boat were simulated, and their performances were compared to the IMO standard. The results suggest that the minimum breadth (B) - draft (d) ratio which meets the stability criterion is 2.50, while the ratio of the center of gravity distance from the keel (KG) and the depth (D) of the boat is 0.65. Furthermore, for the boat with a higher B and D ratio, its resistance is relatively smaller. In terms of seakeeping ability, particularly roll and pitch motions, U type bottom performed better than the Akatsuki bottom. Keywords: fishing vessel, sea keeping, ship hull, stability, resistance
{"title":"STABILITAS, HAMBATAN DAN OLAH GERAK KAPAL IKAN MULTI PURPOSE NET/LINE HAULER 20 GT BERDASARKAN KAJIAN UKURAN DAN BENTUK KASKO KAPAL","authors":"Arif Fadillah, Shanty Manullang, Rizky Irvana","doi":"10.29244/JMF.V10I2.29313","DOIUrl":"https://doi.org/10.29244/JMF.V10I2.29313","url":null,"abstract":"Fishing boats are used in capturing or collecting aquatic resources. As a means of production, the boat should meet various conditions of seaworthiness i.e. good stability, good seakeeping ability and minimum resistance. Those criteria can be identified when the boat size and the hull form are designed. This study investigates the effect of the boat dimension and the hull form on the stability, resistance and seekeeping ability. Various sizes and hull shapes of a 20 GT fishing boat were simulated, and their performances were compared to the IMO standard. The results suggest that the minimum breadth (B) - draft (d) ratio which meets the stability criterion is 2.50, while the ratio of the center of gravity distance from the keel (KG) and the depth (D) of the boat is 0.65. Furthermore, for the boat with a higher B and D ratio, its resistance is relatively smaller. In terms of seakeeping ability, particularly roll and pitch motions, U type bottom performed better than the Akatsuki bottom. \u0000Keywords: fishing vessel, sea keeping, ship hull, stability, resistance \u0000 ","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85510543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.29244/JMF.V10I2.29495
S. Sunardi, Ach. Baidowi, E. Yulianto
A gross tonnage (GT) is a volume capacity of fishing vessel regarding its role in the fisheries resource utilization and management affairs. Information regarding GT is important, hence there is a need to conduct measurement in objective manner. The result of GT recalculation conducted by the Ministry of Transportation on under 30 GT fishing vessels showed that there is a significant difference between the documented GT and recalculated GT which indicates a massive mark down. Consequently, most of owners decline the later result as it goes higher and has impact on operational cost. Regarding that problem, this paper investigates the GT calculation process in Indonesia. In order to provide objective measurement, this research compares the existing GT calculation method and numerical computation. The result reveals that both methods produced different GT, which is about 32% gap for fishing vessels in Muncar and 27% gap in Prigi.Keywords: Gross tonnage, fishing boat, measurement, numerical computation
{"title":"PERHITUNGAN GT KAPAL IKAN BERDASARKAN PERATURAN DI INDONESIA DAN PEMODELAN KAPAL DENGAN DIBANTU KOMPUTER (STUDI KASUS KAPAL IKAN MUNCAR DAN PRIGI)","authors":"S. Sunardi, Ach. Baidowi, E. Yulianto","doi":"10.29244/JMF.V10I2.29495","DOIUrl":"https://doi.org/10.29244/JMF.V10I2.29495","url":null,"abstract":"A gross tonnage (GT) is a volume capacity of fishing vessel regarding its role in the fisheries resource utilization and management affairs. Information regarding GT is important, hence there is a need to conduct measurement in objective manner. The result of GT recalculation conducted by the Ministry of Transportation on under 30 GT fishing vessels showed that there is a significant difference between the documented GT and recalculated GT which indicates a massive mark down. Consequently, most of owners decline the later result as it goes higher and has impact on operational cost. Regarding that problem, this paper investigates the GT calculation process in Indonesia. In order to provide objective measurement, this research compares the existing GT calculation method and numerical computation. The result reveals that both methods produced different GT, which is about 32% gap for fishing vessels in Muncar and 27% gap in Prigi.Keywords: Gross tonnage, fishing boat, measurement, numerical computation","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82489589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-01DOI: 10.29244/JMF.V10I2.29483
A. Susanto, Ririn Irnawati, Mustahal, H. Nurdin, Yeni Marliana, Anggi Kurniasih, Niken Widowati, Tya Rizki Murniasih, Nuriman Affandi
Blue swimming crab (Portunus pelagicus) is an important economical fishery commodity for fishermen in Banten Bay that are caught using gill nets and collapsible traps. The increasing of fishing pressure has highly potential to reduce the quality of the catch as exposed in previous studies. However, the comprehensive, and time series analysis of the previous research results have not been conducted. The purpose of this study is to analyze the variations of blue swimming crab caught in Banten Bay through a combination of meta-analysis techniques, fishing trials and field obser-vations to determine the effect of fishing activities on swimming crab sizes, and evaluate the status of swimming crab fisheries in Banten Bay. Standard mean difference from 10 different studies was used as a meta-analysis parameter. The results of the meta-analysis showed that fishing activities were conducted from 2004 to 2018 had a significant effect on the decreasing of the swimming crab size. The average of swimming crab carapace width caught in 2019 approximately 121.66 mm. The proportion of legal swimming crabs in 2014, 2015 and 2019 was more than 80%, so that the status of swimming crab fisheries in Banten Bay is still environmentally friendly.Keywords: carapace width, meta analysis, fisheries, Portunus pelagicus, blue swimming crab
{"title":"META ANALISIS PENGARUH TEKANAN PENANGKAPAN TERHADAP UKURAN RAJUNGAN (Portunus pelagicus) DI TELUK BANTEN","authors":"A. Susanto, Ririn Irnawati, Mustahal, H. Nurdin, Yeni Marliana, Anggi Kurniasih, Niken Widowati, Tya Rizki Murniasih, Nuriman Affandi","doi":"10.29244/JMF.V10I2.29483","DOIUrl":"https://doi.org/10.29244/JMF.V10I2.29483","url":null,"abstract":"Blue swimming crab (Portunus pelagicus) is an important economical fishery commodity for fishermen in Banten Bay that are caught using gill nets and collapsible traps. The increasing of fishing pressure has highly potential to reduce the quality of the catch as exposed in previous studies. However, the comprehensive, and time series analysis of the previous research results have not been conducted. The purpose of this study is to analyze the variations of blue swimming crab caught in Banten Bay through a combination of meta-analysis techniques, fishing trials and field obser-vations to determine the effect of fishing activities on swimming crab sizes, and evaluate the status of swimming crab fisheries in Banten Bay. Standard mean difference from 10 different studies was used as a meta-analysis parameter. The results of the meta-analysis showed that fishing activities were conducted from 2004 to 2018 had a significant effect on the decreasing of the swimming crab size. The average of swimming crab carapace width caught in 2019 approximately 121.66 mm. The proportion of legal swimming crabs in 2014, 2015 and 2019 was more than 80%, so that the status of swimming crab fisheries in Banten Bay is still environmentally friendly.Keywords: carapace width, meta analysis, fisheries, Portunus pelagicus, blue swimming crab","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"129 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86767017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study aims to reduce fuel oil consumption of a 30 GT fishing vessel through configuration design of diesel and electric motor hybrids propulsion system. The configuration design of hybrids propulsion system systematically include; i) loading assumption; ii) prediction of speed-thrust; iii) prediction of fuel oil consumption. Design of hybrids propulsion system was analyzed by using the concept of time domain simulation of vessel movement. The result indicated that the hybrids propulsion system implemented to fishing vessel was very effective to reduce fuel consumption compared with conventional propulsion system, especially in variation of loading and speed condition.Keywords: fishing vessel, hybrids propulsion system and fuel oilPenelitian ini bertujuan untuk mengurangi konsumsi bahan bakar minyak kapal penangkap ikan 30 GT melalui desain konfigurasi sistem propulsi hybrid diesel-listrik. Secara sistematis perancangan sistem propulsi hybrid meliputi; i) asumsi pembebanan operasi; ii) prediksi speed-thrust; iii) prediksi konsumsi bahan bakar. Desain sistem propulsi hybrid dianalisis dengan menggunakan konsep time domain simulation pergerakan kapal. Hasil penelitian menunjukkan bahwa penggunaan sistem propulsi hybrid pada kapal penangkap ikan sangat efektif dalam mengurangi konsumsi bahan bakar dibandingkan dengan sistem propulsi konvensional, terkhusus pada kondisi pemuatan dan kecepatan yang bervariasi.Kata kunci: Bahan bakar, kapal penangkap ikan, sistem propulsi hybrid
本研究旨在通过柴油机和电动机混合动力推进系统的配置设计，降低30gt渔船的燃油消耗。混合动力推进系统的构型设计系统包括:1)载荷假设;Ii)速度推力预测;Iii)燃油消耗量预测。利用船舶运动时域仿真的概念，分析了混合动力推进系统的设计。结果表明，与传统推进系统相比，混合动力推进系统在降低渔船燃油消耗方面非常有效，特别是在载荷和航速变化方面。关键词:渔船，混合动力推进系统和燃油penelitian ini bertujuan untuk mengurangi konsumsi bahan bakar minyak kapal penangkap ikan 30gt melalui设计，配置系统推进，混合柴油发动机。系统推进混合动力系统;1)假设(asumsi pembanan operasi)Ii)预测速度-推力;prediksi konsumsi bahan bakar。设计系统推进混合动力分析，邓安，孟古纳坎，康塞普，时域仿真，柏格拉坎。Hasil penelitian menunjukkan bahwa penggunaan系统推进器混合paka kapal penangaan ikkan sangat efektif dalam mengurangi konsumsi bahan dibandingkan dengan系统推进器常规，terkhusus paka kondisi pemuatan dan kekeepatan yang bervarasi。Kata kunci: Bahan bakar, kapal penangkap ikan，系统推进混合动力
{"title":"DESAIN KONFIGURASI SISTEM PROPULSI HYBRID TERHADAP PENGURANGAN KONSUMSI BBM KAPAL PENANGKAP IKAN 30 GT (Configuration Design of a Hybrid Propulsion System to Reduce Fuel Oil Consumption of a 30 GT Fishing Vessel)","authors":"A. Muhammad, Baharuddin, Hasnawiya Hasan","doi":"10.29244/JMF.10.1.1-9","DOIUrl":"https://doi.org/10.29244/JMF.10.1.1-9","url":null,"abstract":"This study aims to reduce fuel oil consumption of a 30 GT fishing vessel through configuration design of diesel and electric motor hybrids propulsion system. The configuration design of hybrids propulsion system systematically include; i) loading assumption; ii) prediction of speed-thrust; iii) prediction of fuel oil consumption. Design of hybrids propulsion system was analyzed by using the concept of time domain simulation of vessel movement. The result indicated that the hybrids propulsion system implemented to fishing vessel was very effective to reduce fuel consumption compared with conventional propulsion system, especially in variation of loading and speed condition.Keywords: fishing vessel, hybrids propulsion system and fuel oilPenelitian ini bertujuan untuk mengurangi konsumsi bahan bakar minyak kapal penangkap ikan 30 GT melalui desain konfigurasi sistem propulsi hybrid diesel-listrik. Secara sistematis perancangan sistem propulsi hybrid meliputi; i) asumsi pembebanan operasi; ii) prediksi speed-thrust; iii) prediksi konsumsi bahan bakar. Desain sistem propulsi hybrid dianalisis dengan menggunakan konsep time domain simulation pergerakan kapal. Hasil penelitian menunjukkan bahwa penggunaan sistem propulsi hybrid pada kapal penangkap ikan sangat efektif dalam mengurangi konsumsi bahan bakar dibandingkan dengan sistem propulsi konvensional, terkhusus pada kondisi pemuatan dan kecepatan yang bervariasi.Kata kunci: Bahan bakar, kapal penangkap ikan, sistem propulsi hybrid","PeriodicalId":59401,"journal":{"name":"海洋渔业","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75629350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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