• 제목/요약/키워드: Multi-species fishery

검색결과 10건 처리시간 0.027초

한국 근해 복수어구 및 다종어업 자원 평가모델 연구 I. 단일어구에 의한 다종자원의 이용 (A Study on the Multi-gear and Multi-species Fisheries Assessment Models in Korean Waters I. Multi-species by a Single Gear)

  • 서영일;장창익
    • 한국수산과학회지
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    • 제34권4호
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    • pp.355-358
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    • 2001
  • 본 논문은 한국 근해 다종어업 자원의 평가모델에 대한 연구결과로서 대형기선저인망쌍끌이어업과 같은 단일어업에 의하여 다종자원을 이용하는 형태이다. 단일어구에 의한 다종자원의 평가모델은 단일어구에 어획되는 다종자원 중 어획량비율이 상위를 차지하는 어종을 선별한 후 각 어종에 대한 혼획율 및 자원생태학적 특성치를 추정하여 Beverton and Holt (1957)의 가입당생산량 모델을 변형시킨 다종가입당 생산량모델을 이용하는 것이다. 이 모델은 현재의 $t_c$에서 다종에 대한$F_{0.1}$에 해 당하는 F값을 구하여 각 어종별 가입당산란자원량 모델에 적용하였으며, 이때의 산란자원량 수준인 $F_{x\%}$를 추정하여 자원평가에 이용하였다.

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한국 근해 복수어구 및 다종어업 자원 평가모델 연구 II. 복수어구에 의한 단일 어종 자원의 이용 (A Study on the Multi-gear and Multi-species Fisheries Assessment Models in Korean Waters II. Single-species by Multiple Fisheries)

  • 서영일;장창익
    • 한국수산과학회지
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    • 제34권4호
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    • pp.359-364
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    • 2001
  • 복수어구에 의한 단일 어종 자원의 평가모델은 단일 어종에 대한 복수어구의 어획노력량이 다르므로 어업별 어획노력량을 하나의 노력단위로 표준화하여, Fox (1970)에 의한 잉여생산량모델에 적용함으로써, 최대지속적생산량, 최대경제적생산량 및 적정어획 노력량의 값을 추정하였다. 여기서는 참조기에 대한 대형기선저인 망쌍끌이어업과 근해안강망어업에 대해 적용하였고, 이 두 어업에 대한 경제성 분석을 통하여 순이익을 추정하였다. 참조기에 대한 어업별 순이익의 변동을 비교 분석한 결과 두 어업의 경제성은 근해안강망어업이 대형기선저인망쌍끌이어업 보다 더 나은 것으로 분석되었으며, 두 어업의 순이익을 같게 하기 위해서는 대형기 선저인망쌍끌이어업의 노력량을 현재보다 증가시키고 근해안강망 어업의 노력량은 낮춰야 한다.

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복수의 어업에 의해 어획되는 수산자원의 관리를 위한 연구 (A Study on the Rational Utilization of Resource Catched by Multiple Fisheries)

  • 김병호
    • 수산경영론집
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    • 제14권1호
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    • pp.44-56
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    • 1983
  • This study is attempted to serve the fundamental theory for ‘The reorganization of Korean coastal and adjacent water fishery.’ On the Korean coastal and adjacent water fishery where one species stock is catched by multiple fisheries, traditional analysis is not suitable, as analyzing through adjusting the heterogeneous fishing effort among the fisheries to an unit having same fishing strength. Therefore, this study presents the ‘Multi-Variable Model’, adopting fishing effort from each fishery as independent variable, respectively, in order to analyze the quantitative fluctuation of fishery resource not with fishing strength but with amount of fishing effort, measured by the unit of each fishery. For the sake of simplication, this study assumes that one species is catched by two fishery, premise two assumption. 1) Every fishery has not the selectivity in fishing 2) The promotion of fishing efficiency is accomplished in the same speed. Resource equilibrium equation of each fishery is; $$CPUE_1=\frac{Y_1}{E_1}=a_1+ b_1\cdot E_1+c_1\cdot E_1$$ $$CPUE_1=\frac{Y_1}{E_1}=a_1+ b_1\cdot E_1+c_1\cdot E_1$$ Sustainable yield equation is; $$SY_1=a_1\cdot E_1+\cdot b_1E{_1}{^2}+c_1\cdot E_1\cdot E_1$$ $$SY_1=a_1\cdot E_1+b_1\cdot E_1\cdot E_1+c_1\cdot E{_1}{^2}$$ This study is rudimentary, hereafter, refinemental analysis will be supplemented.

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기후변화에 대비한 환경연구의 방향 (Consideration on new research direction in marine environmental sciences in relation to climate change)

  • 김수암
    • 환경정책연구
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    • 제1권1호
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    • pp.1-24
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    • 2002
  • Due to the recent increase in greenhouse gases in atmosphere, world climate is rapidly changing and in turn, the earth ecosystem responds upon the climate changes. Comparing the ecosystem in the past, the present shapes of ecosystem is the result of the serious modification. Fishery resources in marine ecosystem, which usually occupy the upper trophic level, are also inevitable from such changes, because they always react to the natural environmental conditions. The northwestern Pacific is the most productive ocean in the world producing about 30% of world catch. From time to time, however, it has been notified that abundance, distribution and species composition of major fish species were altered by climate events. Furthermore, primary productivity of the ocean is not stable under the changing environments, so that carrying capacity of the ocean varies from one climate regime to another. Major climate events such as global warming, atmospheric circulation pattern, climate regime shift in the North Pacific, and El Nino event in the Pacific tropical waters were introduced in relation to fisheries aspects. The current status and future projection of fishery production was investigated, especially in the North Pacific including Korean waters. This new paradigm, ecosystem response to environmental variability, has become the main theme in marine ecology and fishery science, and the GLOBEC-type researches might provide a solution far cause-effect mechanism as well as prediction capability. Ecosystem management principles for multi-species should be adopted for better understanding and management of ecosystem.

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QuEChERS 전처리법과 GC-TOF/MS, ECD, NPD를 이용한 잔류농약 다성분분석 (Multi-residue Analysis of Pesticides using GC-TOF/MS, ECD, NPD with QuEChERS Sample Preparation)

  • 박정욱;김애경;김종필;이향희;박덕웅;문수진;하동룡;김은선;서계원
    • 농약과학회지
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    • 제18권4호
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    • pp.278-295
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    • 2014
  • 농수산물검사소에서는 빠르고 정확한 잔류농약검사법이 필요하므로 QuEChERS 시료 전처리법과 GC-TOF/MS(가스크로마토그래피 비행시간질량분석기와 GC-ECD(전자포획검출기), GC-NPD(질소인검출기) 기기분석을 이용하여 잔류농약 동시다성분 분석의 가능성을 살펴보았다. GC-TOF/MS에서는 138종의 농약성분을 0.3, $0.5{\mu}g/g$수준으로 상추에 처리 후 회수율 측정을 하였다. 동시다성분 회수율기준 70~130% 범위에 들어오고 표준편차 20% 이내인 농약은 61종이었다. GC-ECD, NPD에서는 145종의 농약성분 중 71종이 적정한 회수율 범위 내에 들었다. 이러한 결과는 일부 농약성분에 대해 QuEChERS 시료 전처리법과 GC-TOF/MS, GC-ECD, NPD를을 이용한 잔류농약 동시다성분분석 방법 적용 가능성을 보여주었다.

선형계획법을 이용한 생태계 기반 TAC 어업관리에 관한 연구 (A Study on Fisheries Management of Ecosystem-Based TAC using a Linear Programming)

  • 서영일;천성훈;김도훈
    • 수산경영론집
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    • 제45권2호
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    • pp.61-72
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    • 2014
  • This study aimed to empirically investigate the applicability of ecosystem-based TAC (Total Allowable Catch) fisheries management targeting the large purse seine fishery where multi-species are regulated by TAC. Using a linear programming, the optimal fishing effort and the catch amount by species which maximize fishing profits were analyzed under the constraint condition of catch limits by species. Analytical results showed that an application of TAC on only chub mackerel would have negative impacts on fish stocks such as hairtail and jack mackerel by increasing the level of fishing effort to achieve its allocated catch limit. However, under the constraint condition of catch limits of all species, it was shown that optimal catches of all species were achieved within their catch limits. It implies the importance of ecosystem-based management considering biological and technical interactions of species those were excluded in the traditional single species fisheries management.

포트폴리오 기법을 이용한 복수어종의 최적 생산관리 전략 (A Strategy for Optimal Production Management of Multi-Species Fisheries using a Portfolio Approach)

  • 김도훈
    • 수산경영론집
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    • 제45권1호
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    • pp.109-119
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    • 2014
  • This study aimed to examine the applicability of a portfolio approach to the ecosystem-based fisheries management targeting the large purse seine fishery. Most fisheries are targeting multispecies and species are biologically and technically interacted each other. It enables a portfolio approach to be applied to find optimal production of each species through expected returns and risk analyses. Under specific assumptions on the harvest quota by species, efficient risk-return frontiers were generated and they showed a combination of optimal production level. Comparisons between portfolio and actual production provided a useful information for targeting strategy and management. Results also showed the possibility of effective multispecies fisheries management by imposing constraints on each species such as total allowable catch quotas.

한국수산업의 해외진출전략에 관한 연구 (Foreign Entry Strategies for Korean Fishery Firms)

  • 김회천
    • 수산경영론집
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    • 제15권1호
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    • pp.131-153
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    • 1984
  • Fishery resources are still abundant compared with other resources and the possibility of exploitation is probably great. The Korean fishery industry has grown remarkably since 1957, and Korea is ranked as one of the major fishery countries. Its of fishery products reached the 9th in the world and the value of exports was 5th in 1982. But recently a growth rate has slowed down, due to the enlargement of territorial seas by the declaration of the 200 mile, Exclusive Economic Zone, the tendency to develop fishery resources strate-gically in international bargaining, the change in function of the international organizations, the expansion of regulated waters, the illegal arrest of our fishing boats, the rapid rise in oil prices, and the fall in fish prices, the development of fishery resources as a symbol of nationalism, the fishing boats decreptitude, the rise of crew wages, regulations on fishing methods, fish species, fishing season, size of fish, and mesh size, fishing quotas and the demand of excessive fishing royalties. Besides the the obligation of coastal countries, employing crews of their host countries is also an example of the change in the international environment which causes the aggravation of foreign profit of fishing firms. To ameliorate the situation, our Korean fishery firms must prepare efficient plans and study systematically to internationalize themselves because such existing methods as conventional fishing entry and licence fishing entry are likely to be unable to cope with international environmental change. Thus, after the systematic analysis of the problem, some new combined alternatives might be proposed. These are some of the new schemes to support this plan showing the orientation of our national policy: 1. Most of the coastal states, to cope with rapid international environmental change and to survive in the new era of ocean order, have rationalized their higher governmental structure concerning the fishery industries. And the coastal countries which are the objectives of our expecting entry, demand excessive economic and technical aid, limit the number of fishing boats’entry and the use of our foreign fishing bases, and regulate the membership of the international fishery commissions. Especially, most of the coastal or island countries are recently independent states, which are poorer in national budget, depend largely on fishing royalties and licence entry fees as their main resources of national finance. 2. Alternatives to our entry to deep sea fishing, as internationalization strategies, are by direct foreign investment method. About 30 firms have already invested approximately US $ 8 million in 9 coastal countries. Areas of investment comprise the southern part of the Atlantic Ocean, the Moroccan sea and five other sea areas. Trawling, tuna purse seining and five other fields are covered by the investment. Joint-venture is the most prominent method of this direct investment. If we consider the number of entry firms, the host countries, the number of seas available and the size of investment, this method of cooperation is perhaps insufficient so far. Our fishery firms suffer from a weakness in international competitive ability, an insufficiency of information, of short funds, incompetency in the market, the unfriendliness of host coastal countries, the incapability of partners in joint-ventures and the political instability of the host countries. To enlarge our foreign fishing grounds, we are to actively adopt the direct investment entry method and to diversity our collaboraboration with partner countries. Consequently, besides proper fishing, we might utilize forward integration strategies, including the processing fied. a. The enterprise emigration method is likely to be successful in Argentina. It includes the development of Argentinian fishing grounds which are still not exploited in spite of abundant resources. Besides, Arentina could also be developed as a base for the exploitation of the krill resources and for further entries into collaboration with other Latin American countries. b. The co-business contract fishing method works in American territorial seas where American fishermen sell their fishery products to our factory ships at sea. This method contributes greatly to obtaining more fishing quotas and in innovation bottom fishing operation. Therefore we may apply this method to other countres to diffuse our foreign fishing entry. c. The new fishing ground development method was begun in 1957 by tuna long-line experimental fishing in the Indian Ocean. It has five fields, trawling, skipjack pole fishing and shrimp trawling, and so on. Recently, Korean fisheries were successful in the development of the Antarctic Ocean krill and tuna purse seining. 3. The acceleration of the internationalization of deep sea fishing; a. Intense information exchange activities and commission participation are likely to be continues as our contributions to the international fishery organizations. We should try to enter international fishery commissions in which we are not so far participating. And we have to reform adequately to meet the changes of the function of the international commissions. With our partner countries, we ought to conclude bilateral fishery agreements, thus enlarging our collaboration. b. Our government should offer economic and technical aids to host countries to facilitate our firms’fishery entry and activities. c. To accelerate technical innovation, our fishery firms must invest greater amount in technical innovation, at the same time be more discriminatory in importing exogeneous fishery technologies. As for fishing methods; expanded use of multi-purpose fishing boats and introduction of automation should be encuraged to prevent seasonal fluctuations in fishery outputs. d. The government should increases financial and tax aid to Korean firms in order to elevate already weak financial structure of Korean fishery firms. e. Finally, the government ought to revise foreign exchange regulations being applied to deep sea fishery firms. Furthermore, dutes levied on foreign purchaed equipments and supplies used by our deep sea fishing boats thould be reduced or exempted. when the fish caught by Korean partner of joint-venture firms is sold at the home port, pusan, import duty should be exempted.

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영일만 형망어업 어획물의 종조성 및 분포 특성 (Species composition and distribution property of dredge fishery in Yeongil Bay, Korea)

  • 홍성익;배재현;박창두;박종명;윤병선;안희춘
    • 수산해양기술연구
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    • 제52권1호
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    • pp.48-55
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    • 2016
  • The species composition and distribution of catches by dredge gear in the Yeongil Bay, Korea were investigated on a seasonal basis from February to November, 2015. Total catches consisted of 44 species and 35 families. They were 13 species of fish, 10 species of crustacea, 5 species of echinodermata, 5 species of gastropoda, 4 species of cephalopoda and 3 species of bivalvia. Major catch species was shellfish and had seasonal variations in catch. In spring and winter, the catch of ark shell (Scapharca broughtonii) was increased. Adversely, the catch of admas venus clam (Callithaca adamsi) increased in sunmmer and autumn. Species diversity indices was high as the value of 1.99 in spring, and low to the value of 0.34 in summer. In addition, multi dimentional scaling (MDS) indices also was high in spring as the value of 1.99. In summer, the index was low as the value of 0.34. Similarity analysis based on species data was transformed by fourth root. With the result of cluster analysis and MDS analysis, species was divided into two groups. The first group as Group A consists of winter and spring species and another was Group B made of species in summer and winter.

동경 128도 이동 오징어 공조조업에 관한 정치경제학적 연구 (A Political-Economic Study on Cooperative Squid Fishing East to the $E128^{\circ}$)

  • 박성쾌
    • 수산경영론집
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    • 제35권2호
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    • pp.91-115
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    • 2004
  • The main purpose of this study is to analyze the cooperative squid fisheries problems surrounding the $E128^{\circ}$, established by the 1965 Korea - Japan Fisheries Agreement which banned Korean large trawlers' fishing east to the $E128^{\circ}$ In fact, the moratorium was put on by Japans request. However, such issue did not occur until the filefish stock in the southern Korean sea, which was a major target fish species of the large trawl fisheries, The filefish stock collapsed completely around 1991 and at the same time most of bottom fish stocks in the East China Sea began to show a symptom of over - exploitation. Thus, the off - shore large trawlers learned to have a little opportunity of finding out alternative fish stocks as well as fishing grounds. Fortunately, at that time squid resource stock and consumption were on the increasing trend. The large trawl fisheries were able to economically exploit squid stock east to the $E128^{\circ}$ through cooperative fishing with squid angling light boats in the East and East - South Sea, even though such cooperative fishing activities violate the existing fishery laws apparently. Some important reasons that the large trawlers have continued the cooperative fishing seem to be because (ⅰ) squid resource stock has been on the increasing state over time, (ⅱ) the trawl fisheries have made a significant contribution to meeting domestic and export demands and stabilizing squid prices, and (ⅲ) they have kept domestic squid market from foreign competition. However, the new Korea - Japan fisheries agreement in 1998 provided a momentum of questioning the effectiveness of the $E128^{\circ}$ by the squid - related fisheries other than the squid angling. Serious conflicts between squid - related fisheries began to emerge and to be much intensified. Squid angling industries in the East opposed to large trawlers's efforts to formalize such illegal cooperative squid fishing activities. Their main argument was that such formalizing would definitely make the East coast squid prices lower and in turn their business performance would be worse off. The results of quantitative analysis suggest that the trawlers' massive landing may have a significant influence on lowering the east coast squid prices. Now, an important issue that the squid - related fisheries and the government are facing is to solve such complex squid fishing problems through a multi - participatory negotiation process, including price stabilization, total allowable catch level and its operation schemes, $E128^{\circ}$ rearrangement, and so on.

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