• 수산해양기술연구
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• 제52권3호
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• pp.209-219
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• 2016

The survey was conducted to investigate biomass and distribution of fisheries resources using a quantitative echo sounder and a fixed gillnet around Marado coast of Jeju to obtain the scientific basic data for dispute resolution with a large purse seine fishery and coastal fishing and policy establishment of reasonable fisheries resources. Hydroacoustic surveys were conducted six times (November 28~29, 2015 (night), February 23~24, 2016 (night) and March 3~4, 2016 (night/day), March 30~31, 2016 (night/day)) using a quantitative echo sounder. The pelagic fish densities were relatively higher around Marado in November 2015, February 2016 and March 3~4, 2016. However, demersal fish densities were relatively higher in Jeju coastal waters on March 30~31, 2016. Catch data using fixed gill net were used to calculate biomass. Based on the hydroacoustic data, fish length-weight function and target strength information of dominant fish, the biomass of fishes were estimated as follow: 5.64 ton CV = 70.2% at night on November 28-29 2015, 7.14 ton CV = 35.8% of pelagic fish and 530.77 ton CV = 34.6% of demersal fishes at night on February 23-24 2016, 2.34 ton CV = 56.7% of pelagic fish and 571.93 ton CV = 40.3% of demersal fish at daytime, 1.39 ton CV = 48.4% of pelagic fish and 194.59 ton CV = 54.3% of demersal fish at night on March 3~4 2016, 0.37 ton CV = 72.9% of pelagic fish and 338.79 ton CV = 99.7% of demersal fish at daytime, 0.24 ton CV = 21.3% of pelagic fish and 68.61 ton CV = 53.8% of demersal fish at night on March 30~31 2016.

• 한국조리학회지
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• 제23권5호
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• pp.178-186
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• 2017

As a marine city, Busan has the largest factory of fish cake. Busan also has many brands about Busan fish cake. So, this study was conducted on Busan residents to investigate their awareness and preference of Busan fish cake for age-specific purposes. 239 copies of the questionnaire were selected as research subjects, and the SPSS 18.0 was used for frequency analysis, chi-square distribution, analysis and regression analysis. The results were as follows. First, it showed that the brand name of Busan Fish cake has a high preference. Second, there was a high preference for frying. In particular, it turned out to be the most preferred in their 20s. Third, it showed that people in their 60s liked fish cake best. Fourth, in twenties, it turned out to be the largest shopping mall in instant fish cake store. In the linear regression analysis, reliability of brand name "Busan fish cake" appeared to affect preferences. The traditional value of Busan fish cake appeared to affect preferences.

• Journal of Advanced Marine Engineering and Technology
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• 제25권6호
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• pp.1324-1329
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• 2001

The depression of the external situation like the departure of WTO system and the plan of EEZ proclaim is forcing fishery into improving their fishing condition. By this international and domestic circumstance, development of the sea water cooling apparatus for fish hold storage is demanded sincerely. This study represents the thermal characteristics of the fish hold storage during transportation. The numerical analysis in this study is the finite volume method with the SIMPLE computational algorithm to study the seawater flow behavior in the fish hold storage. The computation were carried out with the variations of the circulating flow velocity and depth of fish hold storage. As the result of the three dimensional simulations, the mean temperature doesn't almost change by the circulating flow rate. find the mean temperature is suddenly changed by the ratio of depth of fish hold storage.

• 생태와환경
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• 제42권4호
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• pp.422-431
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• 2009

This study was to provide basic data for aquatic ecosystem research using fishes. Field sampling was carried out at five selected sites of Gap Stream, and fish samples, especially for a selection of sentinel species were collected three times in June, September, and October 2007. We analyzed total length distribution of Zacco platypus in relation with the season and the sampling sites, and then compared with total body weight, condition factor (K), and age distribution of the fish. The fish population data were compared with physico-chemical water quality, obtained from the Ministry of Environment, Korea. Water quality analysis showed a significant nutrient enrichment, based on total nitrogen (TN) and total phosphorus (TP), and organic matter pollution, based on biological oxygen demand (BOD) and chemical oxygen demand (COD) in the Site 5, which is directly influenced by wastewater disposal plant (WDP). Population analysis of the sentinel species showed that the total number of individuals, age distribution, and the population size-structure were influenced by the effluents from the WDP, and that reproductive failure of young-age population were evident in Site 5. According to the relation analysis of total weight to K, the disturbed population was mainly attributed to combined effects of habitat modifications and chemical degradations. Regression analysis of K values against water quality parameters showed significant (p<0.05) positive relations with nutrient and organic matter contents. Our data suggest that the population structure using a sentinel fish species reflected the ambient water quality in the stream and that diagnosis of aquatic ecosystem health using Z. platypus population may be practical for water resource and ecosystem conservations.

• 한국어류학회지
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• 제18권2호
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• pp.129-140
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• 2006

제주도 서부 해역에서 어류 난 자치어의 계절별 출현현황을 조사하기 위해 2004년 9월부터 2005년 8월까지 총 5회에 걸쳐 각 계절별로 난 자치어를 채집하였다. 조사기간 동안 난과 자치어는 모두 여름철인 8월에 가장 많이 출현하고 있었다. 본 연구해역에서 조사기간 동안 출현한 전체 자치어는 총 10목 26과 51속 59종으로 이들 중 농어목 어류가 15과 41종으로 가장 많이 출현하였고, 다음으로 쏨뱅이목 2과 7종, 큰가시고기목 2과 2종의 순으로 출현하고 있었다. 계절별 자치어 출현현황에 있어서 출현종수는 8월에 25종으로 가장 많이 출현한 반면에 5월에 6종으로 가장 적은 출현종수를 나타내고 있었다. 계절별 자치어 출현량에 있어서 고수온기인 여름철에는 주로 멸치, 고등어류와 같은 회유성 어종들이 풍부하게 출현하여 우점을 이루고 있는 반면에 저수온기인 겨울철에는 쏨뱅이, 볼락과 같은 정착성 어종들이 우점을 이루고 있었다.

• 한국수산과학회지
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• 제36권5호
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• pp.486-494
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• 2003

Distribution of ichthyoplanktons and its relation to environmental factors (temperature, salinity, $chlorophyll\;\alpha$) around the Youngsan River Estuary of Mokpo, southwest coast of Korea were investigated based on the samples collected bimonthly from February to December, 2001. Unidentified fish eggs were most abundant $1,345\;eggs/100m^3$ in August, while eggs of Engraulis japonicus were most abundant $63\;eggs/100m^3$ in June. A total of forty species of fish larvae and juveniles belonging to the twenty families under six orders were caught, with six gobiids, four icefishes, four croakers and three herrings being represented. Fish larvae and juveniles peaked $17,757\;inds./100m^3$ in August, which consisted of $91.02\%$ of gobiids, $3.69\%$ of gunnels and $3.67\%$ of icefishes, and they were most abundant $7,467\;Inds./100m^3$ at St. 7. Cluster analysis based on the individuals of fish larvae and juveniles showed that six months were classified into two groups at the dissimilarity 70, the first was composed of June and August and the second was February and December and April and October were not clustered with any other months. In August when species diversity index was the highest, eight stations were classified into two groups at the dissimilarity 70, the first was composed of St. 1, 3, 4, 5 and 8 and the second was St. 6, 7 and 2. As a result from correspondence analysis, there is no effect of the environmental factors with a density of fish eggs and larvae, but correlation could be found between a density of fish eggs and $chlorophyll\;\alpha.$

• 한국수산과학회지
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• 제55권4호
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• pp.461-477
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• 2022

We investigated the community structure and performed detailed characterization of fish larvae assemblages collected from the southern coast of Korea in the spring and summer of 2021. The total abundance of fish larvae varied from 193.6 to 1,915.6 ind. 10 m^-3. The species were distributed across 10 orders with 23 families, and 41 taxa. The dominant taxa were Gobiidae spp., Engraulis japonicus, Nibea albiflora, Sebastiscus spp., Callionymus valenciennei, Pennahia argentata, Sebastes thompsoni, Parablennius yatabei, and Platycephalus indicus. Engraulis japonicus individuals were collected from April to August and their presence contributed greatly to the total abundance of fish larvae. The total number and abundance of species peaked in early summer and the Shannon-Weaver index was in the range 0.11-1.49. Redundancy analyses revealed that the major environmental factors affecting the fish larvae assemblage differed according to the dominant taxa. Water temperature, zooplankton density, and Paracalanus parvus s. l. density were the key factors affecting the spatial and temporal distribution of fish larvae in the southern coast of Korea in spring and summer.

• 수산경영론집
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• 제40권2호
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• pp.49-70
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• 2009

This study proviedes GARCH model(Bollerslev, 1986) to analyze the structural characteristics of price volatility in domestic aquacultural fish market of Korea. As a case study, flatfish and rock-fish are analyzed as major species with relatively high portion in an aspect of production volume among fish captured in Korea. For analyzing, this study uses daily market data (dating from Jan 1 2000 to June 30, 2008) published by the Noryangjin Fisheries Wholesale Market which is located in Seoul of Korea. This study performs normality test on trading volume and price volatility of flatfish and rock-fish as an advanced empirical approach. The normality test adopted is Jarque-Bera test statistic. As a result, first, a null hypothesis that "an empirical distribution follows normal distribution" was rejected in both fishes. The distribution of daily market data of them were not only biased toward positive(+) direction in terms of kurtosis and skewness, but also characterized by leptokurtic distribution with long right tail. Secondly, serial correlations were found in data on market trading volume and price volatility of two species during very long period. Thirdly, the results of unit root test and ARCH-LM test showed that all data of time series were very stationary and demonstrated effects of ARCH. These statistical characteristics can be explained as a reasonable ground for supporting the fitness of GARCH model in order to estimate conditional variances that reveal price volatility in empirical analysis. From empirical data analysis above, this study drew the following conclusions. First of all, from an empirical analysis on potential effects of seasonality and the day of week on price volatility of aquacultural fish, Monday effects were found in both species and Thursday and Friday effects were also found in flatfish. This indicates that Monday is effective in expanding price volatility of aquacultural fish market and also Monday has higher effects upon the price volatility of fish than other days of week have since it has more new information for weekend. Secondly, the empirical analysis led to a common conclusion that there was very high price volatility of flatfish and rock-fish. This points out that the persistency parameter($\lambda$), an index of possibility for current volatility to sustain similarly in the future, was higher than 0.8-equivalently nearly to 1-in both flatfish and rock-fish, which presents volatility clustering. Also, this study estimated and compared and model that hypothesized normal distributions in order to determine fitness of respective models. As a result, the fitness of GARCH(1, 1)-t model was better than model where the distribution of error term was hypothesized through-distribution due to characteristics of fat-tailed distribution, was also better than model, as described in the results of basic statistic analysis. In conclusion, this study has an important mean in that it was introduced firstly in Korea to investigate in price volatility of Korean aquacultural fishery products, although there was partially a limited of official statistic data. Therefore, it is expected that the results of this study will be useful as a reference material for making and assessing governmental policies. Also, it is looked forward that the results will be helpful to build a fishery business plan as and aspect of producer, and also to take timely measures to potential price fluctuations of fishery products in market. Hence, it is advisable that further studies related to such price volatility in fishery market will extend and evolve into a wider variety of articles and issues in near future.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2002년도 추계 수산관련학회 공동학술대회발표요지집
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• pp.270-272
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• 2002

Competitive species have the same spatial distribution (habitat) and foraging behavior (niche), while non-competitive species have either different feeding behavior or spatial distribution. Therefore, ecological segregation among species of fish results rfom differences in foraging behavior and spatial distribution (Allen, 1984; Zhang 1988). To explore these ecological strategies among major small fish pelagics in Korean waters, distribution of CPUE in the Korean large purse seine fishery were examined. (omitted)

• 한국환경생태학회지
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• 제30권1호
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• pp.48-57
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• 2016

예당저수지의 수변 농경지의 어류와 양서류 분포 특성을 파악하고자 실시되었다. 이를 위해 비수변 농경지를 대조군 지역으로 설정하고 수변 농경지의 어류와 양서류의 개체수 및 생물량 비교, 어류와 양서류 분포에 영향을 주는 환경요소 분석, 시기별 개체수 변동 특성을 연구하였다. 전체 조사 대상지역에서 포획된 어류종수는 8과 13종이며, 양서류 종수는 5종이었다. 수변 농경지에서는 미꾸리과 어류, 붕어, 잉어 등의 13종의 어종이 포획되었고, 비수변 농경지에서는 미꾸리과 어류, 붕어 등의 3종의 어종이 포획되었다. 양서류는 황소개구리, 참개구리, 청개구리, 한국산개구리, 옴개구리 총 5종의 유생이 포획되었는데, 비수변 농경지에서는 5종의 양서류 유생이 포획되었고, 수변 농경지에서는 2종의 양서류 유생이 포획되었다. 수변 농경지와 비수변 농경지의 어류와 양서류 분포 특성을 분석한 결과, 수변 농경지에는 잉어과 어류가 많이 포획되었으며, 비수변 농경지에는 미꾸리과 어류가 많이 포획되었다. 어류의 분포에 영향을 주는 환경요소 분석결과, 잉어과 어류는 겨울철에 담수되고, 예당저수지와의 거리가 가까운 농경지에서 주로 출현할 가능성이 높으며, 미꾸리과 어류는 산간 저수지로부터 용수가 공급되고, 논과 배수로가 잘 연결되어 있는 농경지를 선호하는 것으로 나타났다. 양서류의 경우, 비수변 농경지에서 수변 농경지보다 양서류의 유생이 많이 포획되었다. 수변 농경지에서는 황소개구리가 우점하였고, 비수변 농경지에서는 참개구리가 우점하였다. 황소개구리 유생의 분포에 영향을 주는 주요 환경요소는 겨울철에 담수되고 예당저수지에 가까운 농경지에서 출현할 가능성이 높았고, 참개구리의 경우는 산까지의 거리가 가깝고 예당저수지까지의 거리가 멀수록 출현할 가능성이 높았다.