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On the Fishing Grounds of Buse and Oceanographic Condition in the Yellow Sea and the East China Sea (동지나해${\cdot}$황해의 부세어장과 해황과의 관계)

  • HONG Chol-Hoon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.18 no.1
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    • pp.67-73
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    • 1985
  • The relationship between the fishing grounds of Buse, Pseudosciaena crocea (Richardson), and oceanographic condition in the Yellow Sea and the East China Sea is studied on the basis of the data of the catches of stow net fishery (Fisheries Research and Development Agency, $1967{\sim}1979$) and the oceanographic observation data. The main fishing grounds of the Buse was concentrated in southwestern area of Cheju island and the best catch was in April. CPUE was less than 50 kg/haul in the most pare of fishing grounds, there-fore the conditions of fishing grounds generally were poor and coefficients of variance were also large. In the main fishing period, April, the fishing grounds were generally distributed in colder region of $8^{\circ}C$ through $10^{\circ}C$ isotherm at 50 m depth, than Yellow croaker and Gangdali which were distributed between $10^{\circ}C$ and $15^{\circ}C$.

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Oceanographic Conditions of Eishing Ground of Yellow Croaker (Pseudosciaena polyactis) in Korean Waters (한국연근해 참조기 (Pseudosciaena polyactis Bleeker) 어장의 해황 특성)

  • BAIK Chul-In;CHO Kyu Dae;LEE Chung Il;CHOI Kwang-Ho
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.37 no.3
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    • pp.232-248
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    • 2004
  • In order to utilize fisheries resources under a joint management scheme with adjacent nations, as well as detecting of fishing grounds, the factors which influence yellow croaker (Pseudosciaena polyactis) in Korean waters were studied using historical catch per unit effort and oceanographic data. The main fishing ground near Cheju Island was located along the thermal front formed between the Yellow Sea Bottom Cold Water (YSBCW) and northward moving warm current. When the YSBCW (index temperature: $10^{\circ}C)$ strongly extended southward, the fishing condition were worse than average. Especially, low temperatures greatly influenced stow net fisheries, which were operated in the deep water layer The concentration and dispersal of fishing ground and catch coincided with oceanographic features and the seasonality of water masses.

Rescue, rehabilitation and release of finless porpoise (Neophocaena asiaeorientalis) in Korea (한국 상괭이(Neophocaena asiaeorientalis)의 구조, 재활, 방류)

  • KIM, Moon-Jin;SOHN, Hawsun
    • Journal of Fisheries and Marine Sciences Education
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    • v.28 no.3
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    • pp.861-871
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    • 2016
  • The coastal water of Korean Peninsula is the major habitat for finless porpoises. However, hundreds of finless porpoises are currently caught incidentally by stow-net fishery every year. To prevent the mass mortality of finless porpoises and conserve marine animals, Busan Aquarium has been designated as a "Marine Life Ex-Situ Conservation Institution and Marine Animal Conservation Center," and Cetacean Research Institute, under the National Institute of Fisheries Science have started RRR (rescue, rehabilitation and release) project together since 2011. From 2012 to 2013, four individuals of finless porpoises had been rescued and two of them finally released to their original habitat after fully recovered in July 2013. As a result, according to growth curve of finless porpoise of Korea more than 140 cm of body length, 38 kg of total weight referred to adult, results of observation of the change in the hormone revealed that mating time of finless porpoises is January, Jun and July. To become the initial institution which rescues, treatment, husbandry and releases finless porpoise in Korea.

Maturity and Spawning of Brown croaker Miichthys miiuy in the South-western Water of Korea (한국 서남해 민어(Miichthys miiuy)의 성숙과 산란)

  • Lee, Seung Hwan;Chung, Sangdeok;Kim, Yeong Hye;Yoo, Joon Taek
    • Korean Journal of Ichthyology
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    • v.29 no.2
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    • pp.109-116
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    • 2017
  • We investigated maturation and spawning of Miichthys miiuy in the south-western water of Korea, based on samples collected by stow net from August 2015 to December 2016. We analysed monthly changes in maturity stage, gonadosomatic index (GSI), total length (TL) at 50% group maturity. The spawning period was August to October. We estimated the TL at 50% group maturity as 54.8 cm for females and 49.0 cm for males.

A basic research on risk control measure for reducing the fishermen's occupational accident in offshore and coastal fishing vessel (연근해 어선원 재해 현황과 저감 대책 마련을 위한 기초 연구)

  • Kim, Wook-Sung;Cho, Young-Bok;Kim, Seok-Jae;Ryu, Kyong-Jin;Lee, Yoo-Won
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.50 no.4
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    • pp.614-622
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    • 2014
  • The aim of this study is to research attributes of fishermen's occupational accidents for investigating the measure of risk control on situational condition in the Korean offshore and coastal fishing vessel. Using data of fishermen's occupational accidents are from National federation of fisheries cooperatives for 2013. The results were as belows; Occupational accident occurrence rate was 29.5‰, slips & trips and struck by object and contact with gear were shown severe occurrence pattern. Occupational accident occurrence rate of offshore fisheries was 130.2‰, coastal was 16.9‰, specially the risk rates were severely high in several type of danish seine, stow net and offshore trap. Death rate by accidents was 10.6‰ and by fall into the water in occurrence pattern was 5.5‰.

Cases of Fishery Co-management in Korea : 'Fishery Closures' of Fisheries Cooperatives (어업인 참여 수산자원관리 운영에 대한 연구 : 수협의 휴어제 운영 사례)

  • Lee, Chang-Soo;Lee, Sang-Go
    • The Journal of Fisheries Business Administration
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    • v.49 no.3
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    • pp.29-47
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    • 2018
  • The primary purpose of this paper is to introduce the cases of fishery co-management, particularly in Korea. In recent, the fishery co-management between the government and fishermen has been brought an important shift of paradigm in a part of Korean fishery management policy. In case of Korea fisheries area, three fisheries cooperatives(which refer to purse sein fishery, trawl fishery, stow net fishery) have a minority of co-management programs. Generally, the main method of fishery co-management programs is 'Fishery Closures' among the programs, and others are restriction of fishing gear and fishermen educations. In spite of the efforts and time consumes of Korean government and fisheries cooperatives, much to our regret that it is hard to confirm visible results in an increased amount of fisheries resources so far because of the time constraint, namely fishery co-management programs have been conducted just since two to three years before. However, what's certain is that fishery co-management programs make it possible to positively effect on both of area in fishermen and fisheries resources. Accordingly, it is necessary that Korean government and fishermen should extend the fishery co-management to other fishery areas as soon as possible we can in order to efficiently reduce administrative costs and effectively reserve fisheries resources.

Change of relative fishing power index from technological development in the small yellow croaker drift gillnet fishery (참조기 유자망어업에서 어로기술개발에 따른 어획성능지수 변동)

  • SEO, Young-Il;OH, Taeg-Yun;CHA, Hyung-Kee;KIM, Byung-Yeob;JO, Hyun-Su;JEONG, Tae-Young;LEE, Yoo-Won
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.55 no.3
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    • pp.198-205
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    • 2019
  • The small yellow croaker (Larimichthys polyactis) is one of the representative high-class fish species in Korea. The catch of small yellow croaker in adjacent water fisheries has been continuously decreasing from 59,226 tons in 2011 to 19,271 tons in 2016. The small yellow croaker is caught by gillnet, stow net and bottom trawl, among which about 55~65% is caught by gillnet. For the sustainable use of small yellow croaker, the fishing power of small yellow croaker drift gillnet is very important. Therefore, the change of fishing power index were analyzed to identify the development of the vessel and gear technology that may have improved the fishing efficiency of the small yellow croaker drift gillnet fishery from 1960s to 2010s. Gross tonnage and horse power per fishing vessel was increased annually. The mesh size was 75.0 mm in the 1960s, but reduced to 60.6 mm in the 1980s and to 51.0 mm in the 2000s. In the 1960s, it was hauled out by manpower. However, the net hauler were modernized and supply rate was also increased since 1970. Due to the mechanization of the net hauler, the number (length) of used net gradually increased from 1.5 km in the 1960s to 7.5 km in the mid-1980s and to 15 km in 2010. Colour fish finders and positioning system were introduced and utilized from the mid-1980s. Surveys on the supply and upgrading of fishing equipment utilized visiting research. Therefore, the relative fishing power index in the small yellow croaker drift gillnet fishery increased from 1.0 in 1980 to 0.8 in 1970, to 1.1 in 1990, to 1.6 in 2000 and to 1.9 in 2010. The results are expected to contribute to reasonable fisheries stock management of the small yellow croaker drift gillnet fishery.

Analysis of the Spillover Effects on the Management Profits of Offshore Fishery by the Fluctuations in the Crude Oil Prices (원유가상승이 근해어업의 경영수지에 미치는 파급효과 분석)

  • 김현용;강연실
    • The Journal of Fisheries Business Administration
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    • v.32 no.1
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    • pp.15-39
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    • 2001
  • The study, using the input-output analysis of 402 industrial sectors by Bank of Korea(BOK) and the resulting outcomes of price model, aims to evaluate the spillover effects the international fluctuations in crude oil prices have on the commodities prices and consequently, analyse the management and profitability of the offshore fisheries in Korea. At present, the fisher men are provided with tax-free oils for their fishing operations as specified under the Special Tax Treatment Control Law. However, the exhaustion of marine resources and new international fisheries agreements, which resulted in the loss of fishing grounds, made the stable catch even more unpredictable and the hike in the price of the international crude oil would have adverse effects on the fishing industry. The study revealed that the increasing rise in the price of crude oil would exert sweeping spillover effects on other industry sectors in general and accordingly, lead to a poorer performance by fisheries. The price spillover coefficients for the diesel oil was 0.6026, which would translate into the 42.6% increase in the prices of oil when the increase ratio of 73.3% for the base crude oil was applied based on the calculation methods employed in the study. This in turn increased the ratio of diesel oil required in the offshore fisheries from 23.3% to 16.6%, diminishing the ratio of current net profits to minus 2.0% from 4.2% otherwise. By fishing type, the Pair Trawl suffered current net profits loss most by ratio of minus 9.4% and other fisheries such as Coastal Stow Nets, Coastal Angling, Danish Sein also suffered ratio of 7% and more in the loss of current net profits. With the deteriorating fishing performance, coupled with the increasing international crude oil prices, it is urgently required that the authorities concerned deliberate in depth on such schemes as follows in efforts to secure stable fishing production. First, provision of large-scale storage facilities for oil is needed to timely adapt to the fluctuations in international crude oil prices. Secondly, in line with the stabilization of tax-free oil prices, duty levied on oils for fishing and tax collected from the refineries need to be tax-exempt. Thirdly, the beneficiaries from the provision of tax-free oil should be broadened, not limited to special fishing operation only. Fourth, investment in stabilization of the oil prices should be encouraged, possibly through funding from the formation of fisheries development funds underway.

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A Study on the Rotary Tidal Current in the East China Sea (동지나해 어장의 회전 조류에 관하여)

  • 김진건
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.22 no.2
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    • pp.1-6
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    • 1986
  • Even though it is well known that the tidal current in the East China Sea rotates clockwise, few report can be found about the precise pattern of it. To furnish some information available for the stow net fishermen, the author carried out the observation over 235 semidiurnal tidal cycle to investigate the pattern of the set and the rate of tidal current in the Korean fishing section 250 and 494, by reading the current meter and by tracing the corner reflectors with radar onboard the anchored obsen'ation vessel, from May 12, 1984 through February 27, 1986. The results obtained are as follows: 1. The mean semidiurnal tidal cycle was 12 h 20 m during spring tide, and 12 h 30 m during neap tide. 2. The mean interval from the calculated time of high water until the current began to set north was 2 h 30 m and 2 h 15 m in the fishing section 250 and 494 respectively, and the mean interval from the time of low water current began to set south was about 2 h 0 m in both sections. 3. In comparison of the occupied times to vary the set from one of 8 principal bearing points to the neighboring one, the shortest was while the set varied from N to NE and S to SW in the section 250 and 494 respectively. Contrary the longest was while the set varied from SE to S and from W to NW in the section 250 and 494 respectively. 4. In comparison of the rate while the set varied from one of 8 principal bearing points to the neighboring one, the fastest was while the set varied from SE to Sand NW to N in the section 250, and E to SE and W to NW in the section 494. Contrary the slowest was while the current set to NE and S W in the section 250, and N, NE and S W in the section 494.

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Tidal Flats and Resident Life : The Case of Bay, Gomso Bay, Youngwang Tidal Flat (서해안 갯벌과 주민 생활 -가로림만, 곰소만, 영광 갯벌을 사례로-)

  • Lee, Yun-Hwa
    • Journal of the Korean association of regional geographers
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    • v.12 no.3
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    • pp.339-351
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    • 2006
  • The purpose of this study is to investigate and analyze the relationships between tidal cycles, surface landforms, and sediments of tidal flats and their resident life. The study areas are Uengdo Ri in the Garolim Bay with wide the mud flat, Doou Ri in the Youngwang tidal flat which is developed sand flat and salt field, and Gomso Bay which is developed aquaculture industry. For resident around tidal flats, sea working takes precedence over farming, and main earnings gets from tidal flats. Resident life around the tidal flats is deeply related to tidal cycles, and low water level of spring tide becomes, they are most active and get more earnings than usual day, so it seems to be periodic markets. It is usually developed shellfish aquafarms in the mud flat, the stow net fishery in the sand flat, and salt fields in the mixed flat near the coast. Also a tidal flat has specialization of economic activity, and is divided into salt field and fish-farming in the supratidal zone, shellfish aquafarm in the intertidal zone, and oyster and porphyra culture in the subtidal zone.

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