• 수산해양기술연구
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• 제43권4호
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• pp.339-346
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• 2007

Estimating fishing capacity is one of current hot issues in the international fisheries. It is because that increased fishing capacity has caused not only fish stocks to be reduced, but also additional fishing costs to be incurred without additional incomes, which resulted in decrease of economically viability of fisheries. In order to solve this problem, FAO adopted 'the International Plan of Action for the Management of Fishing Capacity' in 1999 and recommended that member countries to measure fishing capacity and to implement the domestic action plan to reduce excess fishing capacity. This study is aimed at assessing fishing capacity of the octopus coastal trap fishery(OCTF) using data envelopment analysis(DEA) which is a method recommended by FAO. The DEA results on 10 individual OCTF vessels showed that the capacity utilization(CU) was a 0.93 on average, indicating some differences in CU among vessels(0.79-1.0). In addition, results of the sensitivity analysis revealed that under the current level of catch, the gross tonnage, horse power, days fished, and traps per trip could be reduced by 35%, 33%, 16%, and 18% on average, respectively.

• 수산해양기술연구
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• 제45권2호
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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.

• 한국수산과학회지
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• 제14권4호
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• pp.253-259
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• 1981

어획대상 자원에 있어서 감소계수를 z, 완전가입 년령을 a, 최고년령을 b라 할 때 체장조성과 성장곡선식을 이용해서 감소계수 z를 구하는 수학적 모형을 설정하여 고등어와 전갱이의 생잔율을 추도한 결과를 요약하면 다음과 같다. 1. 평균년령을 $U_t$라 하면 a, b, z 및 $U_t$의 관계식은 $$U_t=\frac{a-b ex p[-z(b-a)]}{1-ex p[-z(b-a)]}+\frac{1}{z}$$이다. 2. 성장곡선식을 사용하여 체장조성표의 각 체장계급에 해당하는 년령을 추정하고 전계급에 걸친 평균년령을 계산하였다. 3. $U_t$값을 a, b, z 및 $U_t$와의 관계식에 대입하여 감소계수 z값을 구하고 생잔율 exp(-z) 값을 구하였다. 4. 한국 연안 (제1해구)산 고등어와 전갱이의 감소계수, 생잔율 및 생잔율의 $95\%$ 신뢰구간을 계산한 결과는 고등어가 0.87909, 0.41516, 0.35966-0.47264 전갱이가 2.22327, 0.10825, 0.06897-0.14974이었다.

• 한국수산과학회지
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• 제10권2호
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• pp.137-143
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• 1977

완전상태에 있는 자원에 있어서 감소계수를 Z, 완전가입연령을 $\alpha$라 할때 $\chi세 년급군의 미수는 $N\chi=N\alpha\;\exp\;{-z(\chi-\alpha)}$이므로 체장조성과 성장곡선식에서 감소 계수 z 및 생잔율 $\varrho^{-z}$를 추정하는 방법을 연구한결과를 요약하면 다음과 같다. 1. 최고연령을 b라 하고, a, b, z와 평균연령 $U\chi$와의 관계는 $$U\chi=\frac{a-b\;\exp\;(-z(b-a))}{1-\exp\;(-z(b-a))}+\frac{1}{z}....(1)$$ $$Z=\frac{1}{U\chi-\alpha....(2)$$ 이다. 2. 성장식을 사용하여 체장조성표의 각 체장계급치에 해당하는 연령을 추정하고 전계급에 걸친 평균연령을 계산하였다. 3. $U\chi$값을 $U\chi$, a, b, $\chi$의 관계식에 대입하여 감소계수 z 값을 구하고 이 zrkqtdf 사용하여 생잔율 $\varrho^{-z}$ 값을 구하였다. 4. 황해 및 동지나산 참조기의 감소계수, 생잔율 및 생잔율의 $95\%$ 신속구간을 계산한 결과는 0.82595, 0.43782, $0.43767\~0.43797$였다. 5. 같은 통계자료를 써서 다른 방법으로 계산한 생잔율 0.46089의 상대오차는 약 0.05이였다.

• 한국수산과학회지
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• 제55권5호
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• pp.625-637
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• 2022

The southern coast of the East Sea is an important area affected by large warm currents as it connects the coastal waters of Jeju Island, the South Sea, and Dokdo. From 2017 to 2021, the average catch per unit effort (CPUE; kg/day/ship) of set net fishery at six ports in the Gyeongbuk region off the southern coast of the East Sea was the highest in Gampo, Gyeongju, and the lowest in Hupo, Uljin. Although the seasonal variation in the CPUE differed by region and year, it was generally high in autumn. In the set net fishery in Pohang from 2019 to 2021, we identified 72 species, which decreased to 56 species in 2019, 46 in 2020, and 41 in 2021. The species diversity index slightly increased over the three-year periods. We found positive correlations between the total catch (kg) of subtropical species in autumn and the water temperature at 50 m. Among the most abundant species, we found substantially positive correlations between the CPUE of Scomber japonicus, Scomberomous spp. and Carangids. We also noted positive correlations between the CPUE of Todarodes pacificus, Seriola spp. and Carangids.

• 한국수산과학회지
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• 제54권6호
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• pp.1030-1035
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• 2021

Diving fishermen are demanding permission to use an inspirator that can efficiently catch Manila clam; however, coastal fishermenargue that the use of inspirator devastates the seabed and depletes fishery resources. Therefore, the aim of this study was to evaluate the fishing power of diving gears and its effect on coastal fishing grounds. The average time taken to fish in the seabed (4 m²) with a rake, water gun, and an inspirator was 11.17 min, 13.33 min and 7.81 min, respectivelyThe values of catch per unit time with a rake, water gun, and an inspirator were 3.35 kg/min, 2.26 kg/min, and 3.83 kg/min, respectively. Suspended sediments were observed the most in the water gun fishing area, and were observed more in April when fishing was not carried out than in February when fishing was carried out. However, the difference in the amount of sediment deposited in the fishing area using the three-fishing gears was very small. For an accurate analysis of the impact of the fishing gears on the seabed, supplementary tests such as grain size analysis and changes in benthic organisms need to be conducted.

• 한국환경과학회지
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• 제12권11호
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• pp.1137-1144
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• 2003

To provide evidence that the changes in oceanic environmental conditions are useful indices for predicting stock structure and distribution of the Pacific saury (Cololabis saira), the body length compositions and catch per unit fishing effort were examined in relation to the sea surface temperature(SST) anomalies in the Tsushima Warm Current(TWC) region. The size of the fish became larger(smaller) than the average in the same size category during the season of higher SST(lower SST) as opposed to the normal SST. The year-to-year changes in body size caused by the changes in the environmental conditions led the stock to be homogeneous during the period of high stock level from the late 1950s to early 1970s and in the 1990s. The changes in body size manifested by higher(lower) occurrence rates of larger (smaller) sized groups in relation to temperature anomalies suggest that the changes in the environmental conditions affect the distribution and the structure of the stock in the TWC region. Therefore, if the SST anomaly derived from satellite data is large enough in the early spring months(Mar. or Apr.), it is possible to predict whether or not sea temperature will be favorable for large sized groups of saury at normal or slightly earlier time of commencement of the fishery in spring(Apr.∼June).

• 해양환경안전학회지
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• 제30권4호
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• pp.291-298
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• 2024

진해만은 우리나라 남해 연안의 주요 어장으로서, 여전히 전체 수산생산량에서 적지 않은 기여를 창출하고 있다. 그러나, 수십 년간 산업개발과 고수온과 같은 환경변화로 인하여 진해만의 해양생태계는 과거와 달라지고 있다. 본 연구는 2005년부터 2022년까지 진해만 연안 5개 시군구의 수산생산량, 폐기량, 평균영양단계 및 어업균형지수를 분석하였으며, ARIMA 모델을 이용하여 2027년까지 단기적인 변동 추세를 함께 관찰하였다. 그 결과, 고성지역은 2027년까지 지속적으로 수산생산량이 감소할 것으로 예측되었다. 통영지역은 이매패류의 부산물 처리가 필요한 것으로 평가된다. 해양생태계 지표의 경우, 통영지역에서는 대형 어류 생산 비중이 회복되고, 어업균형지수가 0 이상을 나타내어 해양생태계 구조가 안정적인 것으로 나타났다. 마지막으로 IPCC의 기후변화 시나리오에 따라 2060년까지 진해만의 부어성 어종 6종의 생산량 변동 추이를 비교하였으며, 2020년대 초반 2만 ton 부근까지 감소했던 생산량은 2020년대와 2040년대에 4만 ton 부근 가까이 회복한 후, 2060년까지 점진적인 감소 경향을 나타내는 것으로 예측되었다.

• 수산경영론집
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• 제1권2호
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• pp.1-22
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• 1970

Our fisheries protucts industry has developed rapidly during past 10 years ; production was about twice: fihing fleets increased twice in number and 3 times in tonnage ; export was 5 times. Govermment is trying to develop deep sea fisheries in order to surmount the depression of coast fisheries. At present more than 270 deep sea fishing boats are working with superior skill to other country at the South Pacific, the Atlantic, the Indian, and the North Pacific Ocean. Our deep sea fisheries is consisted of the tuna long line and the trawler. The tuna long line of them has 230 crafts in 1969 ana the deep sea trawler has 40 crafts, too. Comparing to 1962, the number of the deep sea fishing boats has been increased highly to 54 times, 7.71 times average per year increasing rate. The rate of the tuna long line to the trawler at the end of 1969 shows 85:15, More than half of them are 100~200 (equation omitted), if we classify them according to (equation omitted) or boat craft. 70% of them has less than 5 years ships age. The Korean Marine Industry Development Corporation has more than 1/3 fishing fleets, with 91 crafts, if We consider it according to corporation. Considering it according to the financial resources, dependence upon foreign loan is as high as 88%. Catches was 74, 450 M/T ($24, 663, 000)at the end of November in 1969 and it was increased to 113.5 times in catch amount and 118 times in value, comparing to those of 1962. Considering it according to the ocean, the order is arranged to the Pacific, the Atlantic, and the Indian Ocean. The average production amount of each craft is 250~400 S/T a year. The result of export took up 1/3 of total fisheries product export with $ 22, 398, 000 at the end of november in 1969. Employee cost of fishing coast is 8% higher than other fishing. The profit is highest in our fisheries. Most of the products except the trawler fishing are sofa at the fishing grounds to the processing company, and they lose much money. They buy most of bait from Japan, giving $8~10 for 1C/S(10kg). Fish price is $390~520 according to the kind of fish for S/T at the fishing grounds, and the rapid frozen fishes brought to Japan are about $ 800 for S/T. There is much difference. in price. Problems 1. Want of self capital. 2. To get the refrigeration boats enough. 3. International Fishing Regulation. 4. To get high price and to secure consuming grounds. 5. To get home-production of bait. 6. To exploit new fishing grounds. 7. To get larger boats. 8. To get mariner enough. When the problems mentioned above are solved, the Deep Sea Fisheries of oun courtry will be developed more largely.

• KDI Journal of Economic Policy
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• 제12권1호
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• pp.93-110
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• 1990

우리나라의 수산정책(水産政策)과 원양어업관련(遠洋漁業關聯) 정부규제(政府規制)는 과거부터 연안어업보호(沿岸漁業保護)와 기존사업자간의 이해조정을 위해 제한적이고 간섭적인 요소가 많이 존재하고 있다. 이는 사업자들의 기술개발(技術開發) 및 비용절감(費用節減) 의지(意志)를 약화시켜 산업의 장기적 체질강화(體質强化)를 위해서도 바람직하지 않을 뿐 아니라, 사업자간의 형평문제(衡平問題)도 야기하고 있는 실정이다. 또한 오랜 동안 누적되어온 어가안정정책(魚價安定政策)은 국내어가(國內魚價)의 상승을 초래하여 국민경제적 부담이 되고 있을 뿐 아니라, 어업의 산업구조조정(産業構造調整)을 지연시키고 연안(沿岸) 어자원(魚資源)의 고갈을 촉진시키는 한 요인이 되고 있다. 이 연구에서는 현행 원양어업(遠洋漁業) 관련정책(關聯政策) 정부규제(政府規制)의 문제점을 검토하고 원양어업의 장기적 발전과 자율화의 추세에 부응하기 위한 정부규제(政府規制)의 개선방안(改善方案)을 제시하고자 하였다. 주요개선방안으로는 허가과정(許可過程)의 객관화(客觀化)와 투명화(透明化)를 보장하기 위한 의무허가제(義務許可制)의 도입과 이를 통한 연근해어업(沿近海漁業) 구조조정기금(構造調整基金)의 조성, 허가조건 및 업종구분의 단순화와 어선확보(漁船確保)에 대한 규제의 완화를 통한 경영합리화(經營合理化) 여건의 조성, 신어장개척(新漁場開拓)에 대한 유인제공 등을 제시하고 있다.