• 수산해양기술연구
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• 제58권1호
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• pp.75-84
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• 2022

Since South Korea did not adopt the recreation fishing using right (coupon) system, there were no recreation fishing statistics. This study selected 480 fishing vessels (10.4%) of a total of 4,611 fishing vessels (as of December 2019) as a survey sample using stratified sampling. Unlike other research institutes that conducted surveys related to the amount of tide on a one-time, this survey was conducted for five months (from May to October 2020, except the month of August). The captain investigated about types of fish, size, weight, etc. to anglers. A difference from previous studies was that about 7.0 million angler population (fishing more than three times a week) had 19.4 kg of catch per person for a year while other studies showed about 25.5-52.0 kg, respectively. The total fisheries resource catch amount was analyzed to be about 95,000 tons in this study and 116,000-166,000 tons in other studies. So there was a difference of about 1.2 to 1.8 times. This study aims to lay the foundation for the development of the fishing industry by preparing accurate statistical data and securing reliable basic statistics related to the fishing industry. Also, it could be usefully used as basic policy data such as introduction of a fishing using right (coupon) system.

• 한국수산과학회지
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• 제55권6호
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• pp.946-953
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• 2022

Using the management strategy evaluation methods and data on the Korea chub mackerel Scomber japonicus where the state-space logistic production model is used as the operation and the estimation model respectivley, we examined the effects of both Dorn's rule, α and the buffer value for ABC (allowable biological catch), which are used by the Korea fishery managers for decision rules. We set scenarios that have different pairs of buffer and α values, which include those currently used in the management in Korea. Under each sceanario, we projected the fish population biomass until year 2050, during which ABC is determined in each year with the decision rule. We used three kinds of performance measures: (i) whether the biomass in 2050 is overfished; (ii) the average of annual yields over the simulation period; and (iii) the variability of annual yields over the period. We found that the current practice (buffer=0.9, and α = 0.05) resulted in the best performance in terms of avoiding the "overfished" status. However, the current practice failed to reach the maximum average of the annual yields and led to larger uncertainty in the annual yields.

• Fisheries and Aquatic Sciences
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• 제26권10호
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• pp.617-627
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• 2023

Harvest control rules have been recently developed for some fisheries in Indonesia, including grouper fisheries, and are expected to reverse the trend of declining stocks. One of the proposed options of the harvest control rules is to implement the catch size limit. The catch size limit approach, however, is challenging, unless it is supported also with strong fisheries surveillance, law enforcement, and innovation. The catch size limit approach can be done by implementing changes in fishing methods and gear, including the application of different hook sizes in the hook and line fishing gear. This study examines the impact of different hook sizes on the length at first capture (Lc) and on the bell-shaped maximum selectivity using various selectivity models of the two targeted grouper species (Plectropomus leopardus and Plectropomus maculatus) in the Saleh bay, West Nusa Tenggara, Indonesia. We found that increasing hook size influences the grouper's catch size, increasing the Lc and the bell-shaped maximum selectivity of both species. Based on our findings, hook size can be used as one of the practical tools for grouper management measures, as part of harvest control rules to improve grouper stock in Indonesia.

• 수산해양기술연구
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• 제48권1호
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• pp.72-81
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• 2012

Using artificial neural network (ANN) technique, auction prices for common mackerel were forecasted with the daily total sale and auction price data at the Busan Cooperative Fish Market before introducing Total Allowable Catch (TAC) system, when catch data had no limit in Korea. Virtual input data produced from actual data were used to improve the accuracy of prediction and the suitable neural network was induced for the prediction. We tested 35 networks to be retained 10, and found good performance network with regression ratio of 0.904 and determination coefficient of 0.695. There were significant variations between training and verification errors in this network. Ideally, it should require more training cases to avoid over-learning, which leads to improve performance and makes the results more reliable. And the precision of prediction was improved when environmental factors including physical and biological variables were added. This network for prediction of price and catch was considered to be applicable for other fishes.

• 한국수산과학회지
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• 제47권4호
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• pp.419-423
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• 2014

We consider changes in the fishing ground of the small yellow croaker Larimichthys polyactis and discuss their utility in predicting fishing conditions for this species. The fishing ground, which having been formed around Jeju Island since the 1970s, is dominated by the Yellow Sea Bottom Cold Water (YSBCW), and variation in its southward expansion from the Yellow Sea is the single most key environmental factor affecting the L. polyactis catch. When the YSBCW showed strong expansion and the fishing ground shifted to the west and southwest of Jeju Island, as occurred in the late 1980s, late 1990s, and early 2000s, the L. polyactis catch was low; conversely, when expansion was weak, as in the early 1990s and late 2000s, the L. polyactis catch was high. This relationship was statistically significant and should be useful in predicting fishing conditions for L. polyactis.

• 한국수산과학회지
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• 제3권3호
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• pp.149-153
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• 1970

우리나라 연근해에 내유하는 고등어와 전갱이에 있어서 $1926\~69$년의 어획 통계 자료를 이용하여 두 어종간의 상호 관계를 해석한 결과는 다음과 같다. 1. 두 어종간의 상호 관계로서의 장기 파동은 $1927\~36$년, $1937\~45$년, $1946\~55$년, $1956\~66$년, 1967년 이후의 각기로 구분되었다. 2. 두 어종의 상호 변동은 약 10년을 주기로 교체 현상을 보이고 있다. 3. 실제의 어획량의 장기 경향에 대한 연변이는 두 어종 사이에 아무런 상관이 없다. 4. 두 어종의 상호 관계는 1기에서 다음 기로 이행될 때마다 그 양상이 달라지는 것 같다. 끝으로 논문작성에 협조하여 준 이병돈교수와 자료 경리에 협력하여 준 안화부기사에게 감사한다.

• Clinical and Experimental Pediatrics
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• 제57권9호
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• pp.379-383
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• 2014

Recombinant growth hormone (GH) is an effective treatment for short children who are born small for gestational age (SGA). Short children born SGA who fail to demonstrate catch-up growth by 2-4 years of age are candidates for GH treatment initiated to achieve catch-up growth to a normal height in early childhood, maintain a normal height gain throughout childhood, and achieve an adult height within the normal target range. GH treatment at a dose of $35-70{\mu}g/kg/day$ should be considered for those with very marked growth retardation, as these patients require rapid catch-up growth. Factors associated with response to GH treatment during the initial 2-3 years of therapy include age and height standard deviation scores at the start of therapy, midparental height, and GH dose. Adverse events due to GH treatment are no more common in the SGA population than in other conditions treated with GH. Early surveillance in growth clinics is strongly recommended for children born SGA who have not caught up. Although high dose of up to 0.067 mg/kg/day are relatively safe for short children with growth failure, clinicians need to remain aware of long-term mortality and morbidity after GH treatment.

• 한국어류학회지
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• 제18권3호
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• pp.223-233
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• 2006

2001년 4월부터 10월 사이에 돌산도 율림 앞바다, 2002년 4월부터 10월 사이에 연도 앞바다, 그리고 2003년 4월부터 12월 사이에 돌산도 임포 먼바다에서 정치망에 어획된 수산생물의 일일 어획자료를 이용하여 종조성과 양적 변동을 파악하고, 연도별, 장소간 종조성을 분석하였다. 2001~2003년에 여수 해역에서 정치망에 의해 삼치(Scomberomorus niphonius), 방어류 (Seriola spp.), 갈치(Trichiurus lepturus), 멸치 (Engraulis japonicus), 줄삼치(Sarda orientalis), 살오징어(Todarodes pacificus), 덕대(Pampus echinogaster), 밴댕이(Sardinella zunasi), 고등어(Scomber japonicus), 황아귀(Lophius litulon), 꼴뚜기(Loligo beka) 등이 양적으로 우세하게 어획되어 여수해역에서 정치망으로 어획된 어류의 종조성은 주로 표영성 어류가 대부분을 차지하였다. 연안역에서는 밴댕이, 덕대, 양태 (Platycephalus indicus), 꼴뚜기, 외해역에서는 삼치, 방어류, 갈치, 덕대, 살오징어, 검복(Takifugu porphyreus), 참돔(Pagrus major)의 표영성 주거종 (pelagic resident species)이 우세하였으며, 멸치는 남해 전체에서 계절적으로 연안과 외해를 이동하는 대표적인 우점종이었다. 봄에 연안에 밴댕이와 멸치가, 수심이 보다 깊은 외해에는 내유하는 멸치와 황아귀, 방어류 등 대상으로 어기가 시작되어 여름에 갈치, 삼치, 고등어, 방어류, 줄삼치, 덕대, 살오징어 등의 외양종이 연안과 외해에 회유하여 어획량이 높았다. 가을에는 연안에서 삼치, 멸치, 꼬치고기 (Sphyraena pinguis), 독가시치 (Siganus fuscescens), 주둥치 (Leiognathus nuchalis) 등이 우점하였고, 외해에서는 삼치, 덕대, 학공치(Hyporhamphus sajori), 고등어, 갈치 등이 여름에 이어 계속 출현하였으나 어획량은 감소하는 온대 해역의 전형적인 계절성을 보였다. 남해안에서 정치망에 어획된 출현종은 대부분 부어류이었으며 그 변화 정도가 심하였으나, 대형정치망 일일 어획자료은 부어류 종조성의 계절변동을 분석하는데 유의한 의미를 가질 것으로 판단된다.

• 수산해양기술연구
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• 제25권2호
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• pp.44-53
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• 1989

여수해만의 어장학적 특성을 구명하기 위하여 정치망 어장에서의 해황과 어획율의 변동을 조사한 결과를 요약하면 다음과 같다. 1. 수온의 분포는 봄과 여름에 연안쪽에 높고 외해쪽이 낮았으며, 가을과 겨울에는 그 반대였다. 2. 염분의 분포는 봄과 겨울에 높고 여름과 가을에 낮았으며, 돌산연안에 저염분대가 형성되고 외해에는 고염분대가 형성되었다. 3. 돌산연안쪽 어장에서는 와류현상이 일어났고 여름철에는 수심 30~40m 사이에 수온약층 및 염분약층이 형성되었으며 가을과 겨울에는 거의 균등한 해수가 전해역에 분포하였다. 4. 정치망 어획량의 년변화는 1984년에 최대를 기록하였고 그 이후부터는 감소하였으며, 월별어획량의 변화는 6월에 최대치를 보였고 그 이후부터는 감소해가는 경향이었다. 5. 수온과 염분이 증가함에 따라 어획량은 증가하는 경향이었으며, 수온 21$^{\circ}C$~27$^{\circ}C$, 염분 32.80%~34.00%에서 가장 많이 어획되었다. 6. 어군의 전체조성비는 삼치 28.4%, 멸치 18.0%, 전갱이 19.5%, 정어리 21%, 갈치 7.2%, 고등어 1%, 방어 0.8%이고 꽁치, 게, 오징어는 0.7%이하였다. 7. 어종별 어획시기는 삼치, 갈치, 방어, 게등이 조업기간중 계속 어획되었으며 멸치와 정어리가 4~8월, 전갱이와 고등어가 5~11월, 쥐치, 꽁치, 복어는 4~10월, 오징어가 4~9월에 많이 어획되었다. 8. 어획량이 가장 많았던 6월과 8월에는 풍향이 주로 NE, SSW이고, 풍속은 2.9m/sec 미만이고, 1.008mb이하의 저기압성이었으며, 강수량이 가장 많았었다.

• 수산해양교육연구
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• 제22권3호
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• pp.330-340
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• 2010

This study was investigated the species composition of demersal fishes by a bottom trawler GAYA, in order to be used basic data for resources management of fishery in the jointly controlled waters of the East China sea. We caught 52 species, 1,167 individuals and 186.171kg in biomass in summer, and 1,924 individuals and 200.871kg in biomass in winter The first dominant species in individuals in summer was Glossanodon semifasciatus, and in biomass was Dentex tumifrons. But that in winter was Ovalipes punctatus in both individuals and biomass. It was a special phenomenon that crustacea was to be the first dominant species compared with general offshore fishery in Korea. Catch per unit effort (kg/hr) of bottom trawl in winter was higher than that in summer. There was also big difference by station in the diversity index, the evenness index and the dominant index.