• Title, Summary, Keyword: Fishing power

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Assessment of fishing power and fishing capacity of the snow crab (Chionoecetes opilio) gillnet fishery in the East Sea (동해안 대게 자망어업의 어획 성능 및 어획 능력 평가)

  • Lee, Kyoung-Hoon;Kim, Pyung-Kwan;Kim, Do-Hoon;An, Heui-Chun;Lee, Chun-Woo
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.48 no.1
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    • pp.29-39
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    • 2012
  • Currently, environment-friendly and sustainable fisheries are one of the major issues among fisheries authorities. A variety of alternative management policies and projects are going on to enhance fisheries management systems and fishery resources such as a TAC management program and a VDS (Vessel Day Scheme) management scheme for distant water fishing nations in Western and Central Pacific Fisheries Commission (WCPFC) convention area. These kinds of efforts among fisheries management authorities are aimed at limiting fishing capacity or fishing power. In terms of fisheries management, Fishing capacity and fishing power have increased the importance of the impact on a fishery and level of the resources. Increased fishing capacity and fishing power have caused not only depletion of fisheries resource, but also additional fishing cost. therefore, there is a clear need for authorities to manage fishing capacity and fishing power. It is also help ensure the conservation and sustainability of the fishery resources. Because of lack of data, absolute fishing power is difficulty to measure. The notion of relative fishing power is frequently used. In this study, relative fishing power was assessed using Mastuda (1991) method for fishing power index. The raw data for assessment was based on fishermen's logbook data from sampled fishing vessels in coastal snow crab gillnet fishery. Data Envelopment Analysis (DEA) method was used to assess fishing capacity. DEA is a linear programming methodology to measure the efficiency of a set of entities called Decision-Making Units (DMUs). It was recommended by FAO for assessing capacity in fisheries.

Design of Unification of Power device of Stow-Net Fishing System -Unification of Power Device by Hydraulic Power- (안강망 어로 시스템 동력장치의 통합화 설계 -유압동력을 사용한 동력장치의 통합-)

  • 문덕홍
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.35 no.1
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    • pp.65-76
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    • 1999
  • Our status of off-shore stow-net fishery is in face with many difficult problems; the lack of fisherman by evading the 3-D occupation, the safety accident by unskilled crew and old type fishing system. In order to solve those problems, it is necessary to save the man power and ensure the safety of fishing work by the effective utilization of power and automatization of fishing gear system. This is consists of the side drum driven by main engine, the net hauler, the bow and stern capstan, jib crane etc. Therefore, we suggest the design on unification of power device of fishing gear system as follows; (1) fishing system by uni-hydraulic power and (2) fishing system by electric motor and electro-hydraulic power.

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Assessment of fishing power of common octopus (Octopus minor) trap fishery (낙지통발어업의 어획성능지수 산정)

  • An, Heui-Chun;Lee, Kyoung-Hoon;Park, Seong-Wook;Park, Chang-Doo;Shin, Jong-Keun
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.43 no.3
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    • pp.176-182
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    • 2007
  • Fishing power, which means performance of fishing vessel or catchability of fishing gear, can explain using by fishing power index(FPI) to compare fishery efficiency among uniformity types of fishery that work during the fixed period in specific fishing ground. This research analyzed on their fishing power and catchability using comparing each sampled vessels of coastal trap fishery for common octopus. The results showed that they were no difference in amount of used trap and immersed time etc. in CPUE among sampled vessels, and had no correlation of catch production due to vessel's tonnage. Most vessel's FPI estimates but 3 vessels were higher than the averaged, and showed similar fishing power in general. And then, CPUE and FPI showed that 4 to 5 tonnage vessels would be superior to another, 4 tonnage vessels had also good catchability. Therefore, we estimated that 4 tonnage vessels had the most efficiency work for coastal trap fishery for common octopus.

Change of relative fishing power index from technological development in the Danish seine fishery (외끌이저인망어업에서 어로기술개발에 따른 어획성능지수 변동)

  • JEONG, Tae-Young;LEE, Yoo-Won
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.55 no.4
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    • pp.363-371
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    • 2019
  • Thousands of demersal fishes inhabit in the waters around Korea and most of them are overexploited. One of reasons is technological development, which increases the efficiency of the vessels continuously. The analysis was conducted to identify the change of fishing power index to develop the vessel and gear technology that may have improved the fishing efficiency of the Danish seine fishery from 1960s to 2010s. Gross tonnage was decreased stably, but the horse power was increased annually. The length of ground rope, warp and hand rope was somewhat longer, but changed a little. Color fish finder was utilized from the mid-1960s and positioning system was used five years later. A hydraulic line hauler were introduced in the mid-1980s, and supply rate was gradually increased. Surveys on the supply and upgrading of fishing equipment utilized visiting researchers. Therefore, the relative fishing power index in the Danish seine fishery increased stably from 1.0 in 1970 to 1.0 in 1980, to 1.2 in 1990, to 1.3 in 2000 and to 1.3 in 2010. The results are expected to contribute to reasonable fisheries stock management.

Estimation of fishing power and fishing capacity on coastal stow net fishery in the Korean waters (연안개량안강망 어업의 어획성능 및 어획능력 추정)

  • KIM, Pyungkwan;LEE, Kyounghoon;KIM, Dohoon;LEE, Geonho;AN, Heui-Chun;KIM, Seonghun;YANG, Yongsu
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.51 no.4
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    • pp.583-591
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    • 2015
  • The coastal stow net (stow net hereafter) in Korea is one of the major fishing methods for yellow croaker (Larimichthys polyactis), ribbon fish (Trichiurus lepturus), and anchovy (Engraulis japonicus). In terms of energy efficiency, the stow net fishery is more competitive than towing fishing gears such as trawl gears. The fishing vessels in stow net fishery have consumed less fossil fuel and also have had less carbon dioxide emission into the atmosphere. however, the stow net fishery is necessary to be regulated due to its increased output of the fleet. Therefore, it is required for fisheries authorities to manage the fishing capacity or fishing power for the assurance of fishery's sustainability. For fisheries management authorities, it is necessary to quantify data related to fishing capacity and fishing power to deploy fishery policy in a sustainable way. In terms of data for decision-making, Data envelopment analysis (DEA) method was conducted to estimate fishing capacity. Fishing power index (FPI) was also applied to calculate relative fishing power to approach the problem in a quantitative way.

Change of relative fishing power index from technological development in the offshore large powered purse seine fishery (근해대형선망어업에서 어로기술개발에 따른 어획성능지수 변동)

  • SEO, Young-Il;HWANG, Kang-Seok;CHA, Hyung-Kee;OH, Taeg-Yun;JO, Hyun-Su;KIM, Byung-Yeob;RYU, Kyong-Jin;LEE, Yoo-Won
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.53 no.1
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    • pp.12-18
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    • 2017
  • Lots of fishery stocks are overexploited and the overcapacity exists in Korean fishing fleets. One of the reasons is technological development, which increases the efficiency of the vessels continuously. The analysis was conducted to identify the change of fishing power index to develop the vessel and gear technology that may have improved the fishing efficiency of the offshore large powered purse seine fishery from 1960s to 2010s. Gross tonnage and horse power per fishing vessel was increased annually. Fishing gear material was changed to the knotless webbing to settle faster. Fishing equipments was modernized and supply rate was also increased. Therefore the relative fishing power index in the offshore large powered purse seine fishery increased from 0.4 in 1970 to 1.0 in 1980, to 1.5 in 2000 and to 1.6 in 2010, but the rate of increase slowed down gradually. The results are expected to contribute to reasonable fishery stock management.

An analysis on catch and fishing power of trammel nets by fishing ground (삼중자망에 의한 해역별 어획량 및 어획성능 비교)

  • Bae, Bong-Seong;Park, Hae-Hoon;Jeong, Eui-Cheol;An, Heui-Chun;Yang, Yong-Su;Chun, Young-Yull
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.45 no.2
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    • pp.96-105
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    • 2009
  • For an effective management of fisheries resources, we need fisheries informations necessary for the establishment of reasonable fishing effort and TAC distribution. We carried out fishing research using trammel nets in the coastal sea of Susan-port(Yangyang, Gangwondo, Korea) and Hupo-port(Uljin, Gyeongbukdo, Korea) and analyzed fishing power variation of the fishing gear in terms of species composition, condition and so on for both sites. A total of 29 species were caught with most dominant species of Hippoglossoides dubius followed by Pseudopleuronectes herzensteini, Lophius litulon and Alcichthys elongatus in Susan. The total number of species caught in Hupo was 37 species with most dominant species of Todarodes pacifius followed by Lophius litulon, Hexagrammos agrammus and Pseudopleuronectes herzensteini. CPUE of Susan fishing area per trammel net was 12.74 fish and 2.00kg on average, while it was 6.80 fish and 2.27kg on average for Hupo. The fishing power index for both sites was 1, placing the two fishing grounds in a same level.

Experimental Study of a Power-Over-Fiber Module and Multimode Optical Fiber for a Fishing Camera System

  • Lee, Hyuek Jae;Jung, Gwang S.
    • Current Optics and Photonics
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    • v.1 no.5
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    • pp.468-473
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    • 2017
  • We determined the feasibility of a fishing camera system using an optical fiber as the fishing line by testing a power-over-fiber (POF) module and multimode optical fiber. Operation of the remote camera module (RCM) without the battery was preferred because the removal of the charging or battery replacement section enabled a waterproof single-body type design. The average efficiency of the photovoltaic power converter (PPC) in the tested POF module was 32.6% at 820 nm, and thus, a high-power laser of at least 1.27 W was required for operating the developed RCM with an electrical dissipation of 413 mW. Because the optical fiber was wound on a fishing reel, composite loss composed of bending and tensile loss occurred. To mitigate the composite loss, we employed a simple holder that showed an improvement in the composite loss of 0.38 dB to 0.8 dB, which was considerably better than the losses without the holder.

The Analysis of Fishing Efforts and Catch in Korea (어획노력이 어획량에 미치는 영향분석)

  • Kim, Jung-Ho;Lee, Kwang-Nam
    • The Journal of Fisheries Business Administration
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    • v.39 no.1
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    • pp.163-194
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    • 2008
  • This paper examines the efficacy of the vessel buy - back program implemented by the Korean government between 1994 and 2005. At the descriptive level, it is found that various factors of fishing efforts including power of vessels, fishing days and the number of employees increased during the program. The statistical analysis over the period 1981 to 2005 shows that the amount of weight and power of vessels tend to have a positive impact on the amount of catch with the number of vessels controlled. In particular, 1% increase in weight and power leads to $0.5%{\sim}1.4%$ and $1.0%{\sim}2.0%$ increase in catch, respectively. Therefore, the results suggest that the vessel buy - back program in Korea had contributed to reducing the catch but only as far as it reduced the weight and power of the vessels. As is consistent with the previous literature, it is indicated that the efficacy of vessel buy - back program may be limited by the fishermen's effots to increase the fishing efforts in terms of power of vessels, fishing days or number of employees.

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Analysis and Modeling of Fishing Boat's Power Network for using Renewable Energy Source (신재생 에너지원 활용을 위한 어선 전력계통 분석 및 모델링)

  • Lee, Sang-Jung;Lee, Dong-Gil;Jung, Jee-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.2
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    • pp.182-189
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    • 2016
  • A modeling method of electric power network inside a fishing boat less than 5 tons is proposed for its high-energy efficiency with renewable energy sources. The power network inside the fishing boat consists of a diesel engine, a starter motor, an alternator, battery packs, and electric loads, which are connected in parallel. To obtain proper power network model, the voltage -current characteristics of the electric components are considered to develop elaborate electrical models under several load conditions. Measured data of the battery and alternator current include noise. By using an average method, the AC components from the power network of the fishing boat can be reduced, which is verified by KCL rule. Using the proposed power network model, the power generation of the alternator and the reduction of diesel consumption in the boat's engine are predictable under various operating conditions. The validity of the proposed methodology is verified by comparing simulation results with experimental measurements using statistical inferences.