• 제목/요약/키워드: fishing

검색결과 3,239건 처리시간 0.028초

한국 근해 저인망류 4개 어업의 어장 변화(2008-2014) (Changes in fishing grounds of four drag-bagnet fisheries in Korean waters (2008-2014))

  • 최정화
    • 수산해양기술연구
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    • 제57권2호
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    • pp.93-106
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    • 2021
  • Changes in the fishing grounds for four drag-bagnet fisheries (large trawl, large pair trawl, large Danish seine and middle Danish seine) were investigated by year and sea-blocks in Korean waters. We used catch and effort data by sea-block (latitude × longitude: 30' × 30') of the National Institute of Fisheries Science (NIFS) and yearly fishing production statistics of the Korean statistic information service from 2008 to 2014. The main benthic habitat of fishing ground was sand and sandy mud material. The average swept areas for the four fisheries were 181.7 km2, 606.4 km2, 2,720.9 km2 and 252.8 km2, respectively. The main fishing ground was around Jeju Island and the eastern South Sea. The main fishing ground moved to the northern part of the South Sea during the study period due to a closure of fishing grounds and changes in the target species.

인덕션·메탈할라이드 집어등에 의한 갈치(Trichiurus leptueus)의 유집 효과 비교와 시공간 분포 (Comparison of the effect of fish gathering and spatio-temporal distribution of the largehead hairtail (Trichiurus leptueus) using induction and metal halide fishing-lamp)

  • 박근창;박성욱;노시열;오우석;오선영;이사라;이경훈
    • 수산해양기술연구
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    • 제58권4호
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    • pp.334-344
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    • 2022
  • In this study, we used underwater acoustics to analyze the spatial and temporal distribution characteristics of largehead hairtail (Trichiurus leptueus) based on the luminous thronging of metal halide fishing lamps and induction fishing lamps. As a result, the illuminating power was approximately 1.3 times higher using the metal halide fishing lamp whereas the density of hairtals by distance was approximately 1.9 times higher using the induction fishing lamp. Regarding water depth distribution, hairtails were detected depths of 25-30 m during August and at all water depths in November as assessed using fishing lamps.

어류 가두리에 적용하기 위한 황동 직조 어망의 성능 평가 (Evaluation of brass weaving fishing nets for aquaculture cage applications)

  • 김건우;박수봉
    • 수산해양기술연구
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    • 제60권2호
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    • pp.186-193
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    • 2024
  • Most fishing nets used in fish cage aquaculture are made of synthetic fibers such as polyamide (PA) and polyethylene (PE). Therefore, it is challenging to maintain the internal volume of the fish cage due to biofouling, which can increase the load on the cage or reduce dissolved oxygen levels by impeding smooth current flow. To address this issue, research has been conducted to replace conventional synthetic fiber cage nets with brass nets, demonstrating certain benefits such as improved productivity and ease of fish cage management. However, given the need for a more thorough examination of brass fishing net weaving technology and performance, this study assessed the optimal weaving method for brass fishing nets to be used in fish cages. Additionally, it provided essential data for the practical application of brass fishing nets by evaluating their weight, tensile strength, elongation, fatigue resistance, and wear resistance. The study concluded that weaving brass fishing nets using the chain link method ensures durability, ease of installation, and compact storage in a scroll-like form. Moreover, due to their superior fatigue and wear resistance properties, brass nets can offer increased utility if appropriate net diameter and length are selected to compensate for their higher weight per unit area and relatively higher cost compared to existing fiber fishing nets.

해양안전심판원의 인적구성의 문제점 및 개선방안 (Problems and Ways of Improving on Personal Organization of Maritime Safety Tribunal)

  • 이종근
    • 수산해양교육연구
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    • 제25권3호
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    • pp.564-579
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    • 2013
  • The purpose of Maritime Safety Tribunal is that experts about ship operation investigate and reveal causes of marine disasters and suggest plans to prevent recurrence in Korean Maritime Safety Tribunal which is a kind of administrative court. Despite the fact that 72% of marine disasters is fishing vessel accidents and 75% of collision accidents between vessels which most occur is related to fishing boats, it is the very serious problem that there is no any person with licenses of marine technicians for fishing vessels in judges and investigators of Korean Maritime Safety Tribunal. The operational characteristics of fishing vessels, their sizes, and shift patterns of duties in wheelhouses are completely and incommensurably different from those of merchant vessels. By the way, if the investigators and judges who just consist of merchant vessel experts investigate and judge marine accidents about fishing vessels, there could be errors in establishment of policies to investigate and reveal their causes and prevent recurrence of accidents. Especially, in case of collision accidents between fishing vessels and merchant vessels, it is thought that the marine accident interested provides causes which can be doubtful about fairness of judges. Therefore, it is thought that the ratio of judges and investigators is most desirable to compose it to be similar to the occurrence frequency of marine accidents. For this, the following solution plans are suggested. First, qualification for appointment requires first class marine technicians. But there is the only one vessel which needs the first class in fishing vessels. Therefore, it is thought that the provisory clause should be added so that the second class marine technicians can be used instead of the first class ones. Second, the marine accidents of fishing vessels reach 72% but the fact that there is no any judge and investigator with licenses of marine technicians for fishing vessels is thought to go against the purpose of establishment of Korean Maritime Safety Tribunal. Therefore, it is thought that there is, at least, one more judges and investigators in the central and local Korean Maritime Safety Tribunals. The same method should be applied to judge assistants and investigation assistants.

'일본수산지'의 편찬 배경과 과정에 대하여 (On the Background and the Process of 'Japan Fisheries' Compilation)

  • 서경순
    • 수산경영론집
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    • 제51권2호
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    • pp.25-50
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    • 2020
  • The aim of this study is to overview what changes happened on the maritime field during the early Meiji period, how the compilation of 'Japan Fisheries' linked to the changes, and when the 'Japan Fisheries' was launched, completed and published. The trilogy of Japan Fishing Method, Japan Fishery Products, and Japan's Useful Marine Products are called "Japan's Fishery." These were completed in 1895 for almost ten years since the compilation project was launched in 1886 at the Agricultural and Commercial Ministry. Japan Fishing Method selected, improved and recorded excellent fishing and fishing methods in various Japanese regions at that time whereas Japan Fisheries Products chose excellent fish products from various methods of manufacturing and recorded the enactment and sale of fishery products. Japan's Useful Marine Products is not currently passed on, so it is not known what kind of useful marine products are recorded. However, it can be assumed that the classification method of the "Japanese Fishing Classification Table" published in 1889 was based on the Japan Fishing Index. The cited texts in Japan Fisheries Products are up to 55 documents, including Engisiki and Wakansanzaizukai's "Report of the Great Japan Fishery Association," "Ariticle of the Fisheries Fair," "The Western Fishery Manufacturing Technique" and "Trade Situation with China." Completed with extensive research from old books to the latest fishery information, "Japan's Fishery" is Japan's best "Marine Products Encyclopedia" at the time. It is also a valuable literature that can trace fishing and fishing techniques and methods of manufacturing marine products in each Japanese fishing village before the end of the nineteenth century.

한중 어업질서의 진단 및 양국 어업관계의 개선 방향 (A Study on the transition of Korean-China Fisheries Agreement and improvement of fisheries-relation issues between two countries)

  • 김대영
    • 수산경영론집
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    • 제45권3호
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    • pp.19-37
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    • 2014
  • This study is to focus on the status of implementation of bilateral-fishery order based on the Korea-China fisheries agreement and aims to improve fisheries relationship between two countries. Korea-China Fisheries Agreement entered into force in 2001, and serves as a basic framework of the bilateral fisheries order. However, the fishing order between Korea and China has the following limitations. First, it is standstill of joint response for a practical resource management. Second, there are still gaps between the quotas of mutual accord fishing and fishing operation work performance. Third, China's illegal fishing is taking place consistently. Fourth, the effective cooperation between two countries in fisheries is not carried out. Finally, the Korea has faced difficult situations to adhere to a balanced position in the fishery negotiations due to conflicting positions on China and Japan. In order to solve these problems, the fishing order between Korea and China will be able to maintain the competitiveness of Korean fishery sector by reinforcing Korea's fishing sovereignty, Korea and China, based on trust and cooperation, will make efforts to improve bilateral fisheries relations to maximize mutual benefit in fishery sector. Specifically, first, the two countries should strengthen the resources management based on the scientific research and the improvement of imbalance of the mutual agreed fishing in EEZ. Second, Korea has to achieve our targeted performance of fishing operation and establish a joint resources management system between two countries in the provisional measure zone. Third, Korea should implement to collect fisheries information about China fishing vessels which are operating in the EEZ of Korea. Finally, Korea and China should be building up effective governance framework for the establishment of fishing order.

제주도 애월항 선적 조업어선의 기초생산성 분석 (Analysis of basic productivity of fishing vessels registered on Aewol port in the Jeju island)

  • 이창헌;안장영;최찬문;김병엽
    • 수산해양기술연구
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    • 제50권4호
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    • pp.495-501
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    • 2014
  • In order to propose basic references for the policy making of fishing vessel fishery by Jeju Special Self-Governing Province, we have obtained the basic productivity through analyzing operating days and catches of 16 sample fishing vessels registered in Aewol port, the north of Jeju island in the year of 2011. In addition, to compare with the basic productivity of southern sea area in the Jeju island, that of 7 sample fishing vessels registered in Kangjung port was used. Around Aewol port, average operating days during the main catch period from July to October were over 15 days a month. A average daily catch of fishing vessels was minimum 21.0 kg in May and reached to maximum 54.5 kg in December, showing U-shaped catch pattern through the year. The trend formula of the average daily productivity (y) depending on a tonnage (x) of fishing vessels around Aewol port was described by the equation, y = 18.867 ln(x) + 11.001, and that around Kangjung port in the year of 2009 was understood to be y = 23.271 ln(x) + 25.715. As a result, it seemed that the productivity of fishing vessels around Kangjung port, operating in the southern sea area of Jeju Island, was much greater than that of fishing vessels around Aewol port in the northern sea area of Jeju Island. Especially, that of fishing vessels less than 10 tons was 35-40% more.

근해오징어채낚기어업에서 어로기술발달에 따른 어획성능지수 변동 (Change of fishing power index by technological development in the offshore squid jigging fishery)

  • 오택윤;서영일;차형기;조현수;안영수;이유원
    • 수산해양기술연구
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    • 제54권3호
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    • pp.224-230
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    • 2018
  • Squid is one of the important fisheries resources in Korea. Therefore, squid has been designated and managed as a target species of total allowable catch (TAC) since 2007, but the catch amount is gradually decreasing. The analysis was conducted to identify the change of relative fishing power index to develop the vessel and gear technology that may have improved the fishing efficiency of the offshore squid jigging fishery from 1960s to 2010s. Gross tonnage per fishing vessel increased with the increase in size until 1990, but then gradually decreased to 41.0 tons in 2000 and 37.1 tons in 2010. The illuminating power (energy consumption) by fishing lamps increased to 180 kW in 2005 and stabilized to 120 kW in 2015. Jigging machine started to be supplied to fishing vessels from the early 1970s, and fish finders began to be supplied in the early 1980s and gradually increased. Therefore, the relative fishing power index in the offshore squid jigging fishery increased from 1.0 in 1980 to 1.1 in 1990, to 3.5 in 2000 and to 2.5 in 2010, but the increment rate slowed down gradually. The results are expected to contribute to reasonable fisheries stock management.

강릉시 연안 문어어업에 관한 연구- II - 문어흘림낚시어업 - (Octopus fisheries in the coastal waters of Gangneung- II - Octopus drift-line fishery -)

  • 안영일;박진영
    • 수산해양기술연구
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    • 제42권2호
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    • pp.78-85
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    • 2006
  • A survey on the fishing gear for octopus drift-line fishing was done in Gangwon-do, Sacheon, Gyeongnam and Hokkaido, Japan, while a survey on the environments of fishing grounds used data from January to August from the Korea east coast farming forecast system of Donghae Fisheries Research and Development Institute. The present situation of fishing was examined with boats engaging in drift-line fishing from March to August in the coastal waters along Gangneung. The fishing tackle for octopus drift-line fishing was made manually, and the size, shape, and weight of the hook and number of shooting used vary according to the fishing time and region. Lead is used as the material for sinkers. As bait, pork fat with skin is mostly used in Gangwon-do. The temperature of the bottom water layer in the coastal fishing ground of Gangneung from April to June ranges from $3.2-12.4^{\circ}C$, which is the optimal temperature for octopuses. During July and August, the temperature ranges from $5.0-20.6^{\circ}C$. The maximum difference between day and night temperatures reached up to $9.2^{\circ}C$. Salinity is generally stable at $33.2-35.324.6%_{\circ}$, which does not affect the inhabitation of octopuses. The octopus catch reached its peak from May to July, while most octopuses weighed less than 1 kg (76.7%). The results show that it is effective to carry out octopus drift-line fishing up to a depth of 40 meters; and that the maximum number of octopuses per line is obtained with an operation time of six hours.

Interannual Variability of Common Squid Fishing Ground in the East Sea derived from Satellite and In-situ Data

  • Kim, Sang-Woo;Ahn, Ji-Suk;Lim, Jin-Wook;Jeong, Hee-Dong;Park, Jong-Hwa
    • 한국환경과학회지
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    • 제22권10호
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    • pp.1363-1371
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    • 2013
  • In this study, we estimate the interannual spatial and temporal distributions of fishing grounds at night in the East Sea based on satellite and in-situ data. We observe that the $15^{\circ}C$ thermal front moves in the north-south direction according to the movement of the warm water (above $18^{\circ}C$) in the Tsushima Warm Current (TWC) area, forcing the cold water area (below $10^{\circ}C$) to either expand or shrink. The interannual variations of sea surface temperature (SST) in winter represented by the indicator SST of $6^{\circ}C$ are consistent with the east-west zonal areas in the central East Sea which represented over $1^{\circ}C$ standard deviation of SST in February during 1990-2000. Annual SST in the fishing grounds of common squid fishing vessels, observed both by fishing vessels and satellites range from 9-$22^{\circ}C$, with the satellite-observed data having a larger range than the fishing vessel-based ones. The interannual distributions of the common squid fishing grounds in the East Sea are mostly concentrated in the TWC area in the southwestern part of the East Sea and in the coast of southern Honshu and Hokkaido in Japan. The interannual distributions of the nighttime fishing vessels are consistent with the catches investigated from the fishing vessel.