• Title/Summary/Keyword: 어업총조사

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Composition and Catch Variation of Fishes by a Set Net in the Coastal Waters off Gwideuk, Jeju Island (제주도 귀덕 연안 정치망 어획물의 조성 및 변동)

  • Cha, Byung Yul;Kim, Dae Kwon;Yoon, Jang Taek;Kim, Byung Yeob
    • Korean Journal of Ichthyology
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    • v.20 no.1
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    • pp.28-35
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    • 2008
  • Fishes by a set net in the coastal waters off Gwideuk, Jeju Island were studied to determine species composition and catch variation, 2004. The fishing period conducted by a set net in Gwideuk fishing ground were from April to December. A total of 45,473.2 kg including 21 species was caught during the survey period. Most of them consisted of fishes of 17 species and a few were cephalopods of 4 species. Dominant species were Trachurus japonicus and Siganus fuscescens, 44.3% in the total. And sub-dominant species were Sepioteuthis lessoniana, Seriola dumerili, Seriola quinqueradiata, Loligo bleekeri, Seriola lalandi accounting for 54.4%. Although the number of species had a tendency to decreased from July to December, the catch by a set net was higher in summer and autumn than in spring. Such catch variations were closely related to recruitment of dominant species and also the seasonal variation of fishing ground temperature.

Effects of Hook and Bait Types on Bigeye Tuna Catch Rates in the Tuna Longline Fishery (다랑어 연승어업에서 눈다랑어 어획률에 미치는 낚시 및 미끼의 효과)

  • Kim, Soon-Song;Moon, Dae-Yeon;An, Doo-Hae;Hwang, Seon-Jae;Kim, Yeong-Seung;Bigelow, Keith;Curran, Daniel
    • Korean Journal of Ichthyology
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    • v.20 no.2
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    • pp.105-111
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    • 2008
  • A pelagic tuna longline research cruise in the eastern and central Pacific Ocean from September to October of 2006 was conducted to compare catch rates with the use of different hook type and bait combinations. Traditional tuna hooks (J 4) and three circle hook types (C15, C16, C18), along with five bait types (chub mackerel (CM), jack mackerel (JM), milkfish (MF), sardine (SD), and squid (SQ)) and hook number as a proxy for hook depth were evaluated for their effect on bigeye tuna catch rates (fish per 1,000 hooks) using Generalized Linear Models (GLMs). Results from 28 sets indicated significant differences in bigeye catch rates between individual longline sets and hook number. The GLM explained 33% of the deviance in bigeye catch rates with these two factors. An alternative model formulation included bait type which had a small effect (explaining 2.7% of the deviance) on catch rates. Hook type had a negligible and non-significant effect in the GLMs. These results indicate that all of the hooks and baits tested are equally effective at catching bigeye tuna and that hook number (depth) was the paramount operational factor in explaining bigeye tuna catch rates.

A Review on the Sampling Design for Energy Consumption Survey in Agricultural Sector (농업부문 에너지 소비량 조사를 위한 표본설계)

  • Kim, Yean-Jung;Kim, Bae-Sung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.9
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    • pp.411-417
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    • 2017
  • It is necessary to determine the current and future energy consumption by farm households for the rational specification of energy related policy in the Korean agricultural sector. Especially, It is important to identify the consumption by source of energy and by the crops. On the other hand, the world has tried to reduce the production of greenhouse gases and, in line with this, the Korean government established related legislations to contribute to this reduction (30% reduction in emissionsby 2020). The reduction target of the agricultural sector is specified as 5.2% of the national total. This study focuses on sampling design to determine the energy consumption and emission of greenhouse gases, and suggests several alternatives to improve the confidence level and to make a dent survey and estimation errors. The population for the energy consumption survey of the agricultural sector was derived from agricultural census data. In the case of commodities with high skewness, we cut the sample range to within the statistical significant range. The number of samples in each class is specified using the Neyman allocation method and 95% significance level. The estimation results are compared with the population to verify the statistical significance and several management methods of sampling errors are suggested.

Production of Content for Regional Sources of the Convergence Industrialization -Based on Agricultural Management Entities of the Sixth Industrialization in Chungcheongnam-do- (향토자원의 융복합산업화를 위한 콘텐츠 제작 -충청남도 농업 6차산업화 경영체를 중심으로-)

  • Kang, Keoung-Shim
    • Journal of Digital Convergence
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    • v.13 no.10
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    • pp.483-490
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    • 2015
  • The purpose of this study was to systematically organize the information for the regional resources from the agricultural management entities of convergence industry in Chungcheongnam-do. The target was the Sixth Agricultural Industry Association in Chungcheongnam-do; total 70 kinds of resources were investigated. The content was organized by name of regional source, introduction, photo, company and product information, feature of product, introduction of experience program, and etc., containing the value and meaning of products in stories of the regional sources and images. The material was organized in order of grains, fruits and vegetables, marine products, livestock, Korean sauces Kimchi, fermented broth concentrates, beverages tea, and other. It was saved as pdf file to distribute to the members; it may be utilized for online promotion, product promotion in exhibition festival sales promotion, posts for bulletin board hall, and etc. but also for promotional material in overseas marketing after translating to each language.

Diets of Bigeye and Yellowfin Tunas in the Western Tropical Pacific (서부 열대 태평양의 눈다랑어와 황다랑어의 먹이에 관한 연구)

  • KIM Jong-Bin;MOON Dae-Yeon;KWON Jung-No;KIM Tae-Ik;JO Hyun-Su
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.5
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    • pp.719-729
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    • 1997
  • Stomach contents of bigeye tuna, Thunnus obesus, and yellowfin tuna, Thunnus albacares, caught by longlining in the western tropical Pacific were analyzed to examine their foods and to compare their feeding behavior. The food species of both bigeye and yellowfin tunas were primarily fishes, crustaceans, and cephalopods. A total of 15 fish, 6 crustacean, and 1 cephalopod species were identified from their stomach contents, of which lantern fish (Myctophum sp.) was the most important food for both tuna species. No significant differences in species composition of food items between bigeye and yellowfin tunas were observed, indicating that in the same habitat the tunas have a similar feeding behavior. However, while they showed a remarkable similarity in diet composition, significant quantitative differences on the basis of IRI values were observed in several diet species, such as Myctophidae, Alepisauridae, Oplophoridae, Gammaridae, and Onychoteuthidae.

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Estimation and Mapping of Methane Emission from Rice Paddies in Gyunggi-do Using the Modified Water Management Scaling Factor (수정된 물관리보정인자를 적용한 경기도 논에서의 메탄 배출량 산정과 지도화)

  • Choi, Sung-Won;Kim, Hakyoung;Kim, Yeonuk;Kang, Minseok;Kim, Joon
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.18 no.4
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    • pp.320-326
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    • 2016
  • From the perspective of climate-smart agriculture, it is becoming more critical to accurately estimate the amount of greenhouse gas emissions in the agricultural sector. In order to accurately ascertain the methane emissions from rice paddies, which account for a significant portion of the emission from the agricultural sector, we used the data from the 2010 Agriculture, Forestry and Fisheries Census, the revised water management scaling factors and their calculation program. In order to facilitate the analyses and understanding, the results were mapped using the ArcGIS software. The fact that the validation of the mapped values against the actual field measurements at one site showed little difference encourages the necessity to further this study. The administrative districts-based map of methane emission can help clearly identify the regional differences. Furthermore, the analysis of their major controlling factors will provide important scientific basis for the practical policy makings for methane mitigation.

An Analysis on the Determinants of Employed Labour Quantity in the Fishing Industry (어가의 고용량 결정요인 분석)

  • Kim, Tae-Hyun;Park, Cheol-Hyung;Nam, Jongoh
    • Environmental and Resource Economics Review
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    • v.27 no.3
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    • pp.545-567
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    • 2018
  • This study applied and compared Poisson model, negative binomial model, zero inflated Poisson model, and zero inflated negative binomial model to estimate determinants of employed labour quantity. To estimate each of models, this study used fisheries census data which were obtained at microdata integrated service running by Statistics Korea. The study selected zero inflated negative binomial model according to the Vuong test and Likelihood-ratio test. In addition, the study estimated fishing village's practical changes on employed labour quantity as analyzing changes from 2010 to 2015. The results showed that the household with fishing vessels and high selling price had a significant effect on decrease of the labour quantities. Meanwhile, the longer work experience of the household, the more significant the increase in the labour quantities. In conclusion, this study presented that capitalized fishing household and the acceleration of aging had a significant impact on the change in the labour quantities.

Investigation of Demersal Fisheries Resources of the East China Sea - 2 . Hydroacoustic - Bottom Trawl Survey , November 1989 - (동지나해 저서어류의 자원조사 연구 - 2 . 저서어류자원의 음향학적 조사 ( 1989년 ) -)

  • 박중희
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.26 no.2
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    • pp.143-150
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    • 1990
  • A cooperative Korea-Japan investigation for the demersal fisheries resources of the East China Sea was carried out by using the training ship Oshoro Maru belong to Hokkaido University Japan, during 5-12 November, 1989. The research vessel sampled 24 stations with demersal trawls on the East China Sea continental shelf, and 96 nautical miles of track line were surveyed hydroacoustically. The echo sounder used during the survey was of a scientific type having echo integration capabilities and the computer system was programmed to obtain echo integration data for each depth stratum between the transducer and the bottom. The target strength of fish school(TS per 1kg) was estimated from the relationship between mean volume backscattering strength and catches caught by the demersal trawls. The results obtained can be summarized as follows: 1. Approximately 96 species were identified from survey catches. 2. The mean volume backscattering strength for the layer occupied by bottom trawls at 25 and 100 KHz were-63.9 dB and -67.3 dB, respectively. Then the average catch per unit time of each trawl haul was 58.8 kg/hour. 3. The mean volume backscattering strength for the entire layer between the transducer and the bottom at 25 and 100KHz were -61.9 dB and -67.0 dB, respectively. 4. The mean fish school target strength per unit weight(TS/kg) at 25 and 100 KHz were -23.6 dB/kg and -26.6 dB/kg, respectively.

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Research on Prevalence and Related Factors for the Life-Care of Knee Osteoarthritis in Korean Agricultural and Fishery Population (한국 농어업인 무릎 퇴행성관절염의 라이프 케어를 위한 유병률과 관련 요인에 대한 조사)

  • Lee, Chul-Gab;Ko, Dae-Sik
    • Journal of Korea Entertainment Industry Association
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    • v.14 no.7
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    • pp.633-640
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    • 2020
  • The purpose of this study was to research the prevalence and related factors for the life care of knee osteoarthritis in Koreans agricultural and fishery population. Among the agricultural and fishery population over the age of 50, 816 people were chosen to analyze the prevalence of knee osteoarthritis and the prevalence odds ratio of social demographic or health related factors based on the primitive data of the 5th National Health and Nutrition Examination Survey (2010-2012). The prevalence of knee osteoarthritis was 26.3% and, in demographic terms, female, elders, and individuals with low level of educational attainment and monthly income showed higher prevalence of knee osteoarthritis. In health related factors, nonsmokers and people with higher BMI showed higher prevalence of knee osteoarthritis. The present cross-sectional study showing the prevalence ratio and the prevalence odd ratio revealed a high incidence of knee osteoarthritis in Korean agricultural and fishery populations.

Reproductive Ecology and Spawning of Hoplobrotula armata in the Coastal Waters of Jejudo Island, Korea (제주 연안에서 채집된 붉은메기(Hoplobrotula armata)의 산란생태)

  • Min-Sun Kim;Song-Hun Han;Jun-Chul Ko;Bo-Yeon Kim;Jung Hwa Choi;Seung-Jong Lee
    • Journal of Life Science
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    • v.34 no.2
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    • pp.122-127
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    • 2024
  • This study investigated the reproductive ecology and spawning of Hoplobrotula armata on the coast of Jejudo Island. Samples were collected from February to December 2019 and February to December 2020, with a total of 2,634 samples. The results of the investigation showed that total length (TL) ranged from 22.0 cm to 68.8 cm, and the body weight (BW) ranged from 66.5 g to 3,553.9 g. According to the development process of gonads and the gonadosomatic index (GSI), the spawning period of H. armata was from July to October. The relationship between TL and BW was BW = 0.0024TL3.3278 in females and BW = 0.0035TL3.2162 in males. The sex ratios of surveyed female to male H. armata was 1:0.71, with more females. At 50%, 75%, and 97.5%, the group maturities of H. armata were as follows: Females, 39.9 cm, 42.7 cm, and 49.4 cm; males, 37.6 cm, 40.4 cm, and 46.9 cm, respectively. According to monthly GSI and gametocyte (ovarian, testis) development stage observations of H. armata on the coast of Jejudo Island, they spawn once a year and are presumed to be summer spawners.