Pub Date : 2011-08-31DOI: 10.3796/KSFT.2011.47.3.222
Myounghee Kang, Takeshi Nakamura, A. Hamano
This study is for the multi-dimensional analysis of diverse data sets for artificial reefs off the coast ofShimonoseki , Yamaguchi prefecture , Japan . Various data sets recorded in artificial reefs ground wereintegrated in new GIS software : to reveal the relationships between water temperature and fish schools ; tovisualize the quantitative connection between the reefs and the fish schools ; and to compare the seabed typesderived from two different data sources . The results obtained suggest that the application of GIS inanalyzing multi -dimensional data is a better way to understand the characteristics of fish schools andenvironmental information around artificial reefs and particularly in the evaluation of the effectiveness ofartificial reefs .Keywords: Artificial reef , GIS , Multi-dimensional analysis , Three -dimensional visualization
{"title":"The application of GIS in analyzing acoustical and multidimensional data related to artificial reefs ground","authors":"Myounghee Kang, Takeshi Nakamura, A. Hamano","doi":"10.3796/KSFT.2011.47.3.222","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.3.222","url":null,"abstract":"This study is for the multi-dimensional analysis of diverse data sets for artificial reefs off the coast ofShimonoseki , Yamaguchi prefecture , Japan . Various data sets recorded in artificial reefs ground wereintegrated in new GIS software : to reveal the relationships between water temperature and fish schools ; tovisualize the quantitative connection between the reefs and the fish schools ; and to compare the seabed typesderived from two different data sources . The results obtained suggest that the application of GIS inanalyzing multi -dimensional data is a better way to understand the characteristics of fish schools andenvironmental information around artificial reefs and particularly in the evaluation of the effectiveness ofartificial reefs .Keywords: Artificial reef , GIS , Multi-dimensional analysis , Three -dimensional visualization","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131911115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-08-31DOI: 10.3796/KSFT.2011.47.3.267
H. -. Kim, S. Koh, J. D. Kim
The behavior of abrasive wear on counterpart roughness of glass fiber reinforcement polyurethane resin (GF/PUR) composites were investigated at ambient temperature by pin-on-disc friction test. The friction coefficient, cumulative wear volume and surface roughness of these materials against SiC abrasive paper were determined experimentally. The major failure mechanisms were lapping layers, ploughing, delamination, deformation of resin and cracking by scanning electric microscopy (SEM) photograph of the tested surface. As increasing the counterpart roughness the GF/PUR composites indicated higher friction coefficient. The surface roughness of the GF/PUR composites was increased as the sliding velocity was higher and the counterpart roughness was rougher in wear test.
{"title":"Behavior of abrasive wear on counterpart roughness of glass fiber reinforcement polyurethane resin composites","authors":"H. -. Kim, S. Koh, J. D. Kim","doi":"10.3796/KSFT.2011.47.3.267","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.3.267","url":null,"abstract":"The behavior of abrasive wear on counterpart roughness of glass fiber reinforcement polyurethane resin (GF/PUR) composites were investigated at ambient temperature by pin-on-disc friction test. The friction coefficient, cumulative wear volume and surface roughness of these materials against SiC abrasive paper were determined experimentally. The major failure mechanisms were lapping layers, ploughing, delamination, deformation of resin and cracking by scanning electric microscopy (SEM) photograph of the tested surface. As increasing the counterpart roughness the GF/PUR composites indicated higher friction coefficient. The surface roughness of the GF/PUR composites was increased as the sliding velocity was higher and the counterpart roughness was rougher in wear test.","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127812486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-08-31DOI: 10.3796/KSFT.2011.47.3.214
Yongsu Yang, Kyounghoon Lee, Seong-Chul Ji, Seong-Jae Jeong, Kyongwon Kim, Seong-wook Park
This study was performed to develop a video based system which can be used to measure the averaged fish size in a non-intrusive fashion. The design was based on principles of simple stereo geometry, incorporated fish dimensions weight relationships and took into consideration fish movement to lower system costs. As the fish size is an important factor that impacts the economy of an aquaculture enterprise. Size measurements, including fork length, width or height, girth, thickness and mass, can be used to determine fish condition in the fish farm, so the averaged fish size of fish cage needs to consistently monitor in open ocean aquaculture cage. A precision of for replicate length measurements of a 60cm bar is obtained at distances between 2.0 and 6.0m, and the mean fork length and mean swimming speed of bluefin tuna were estimated to 48.8cm and 0.78FL/s, respectively.
{"title":"Measurement of size and swimming speed of Bluefin tuna (Thunnus thynnus) using by a stereo vision method","authors":"Yongsu Yang, Kyounghoon Lee, Seong-Chul Ji, Seong-Jae Jeong, Kyongwon Kim, Seong-wook Park","doi":"10.3796/KSFT.2011.47.3.214","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.3.214","url":null,"abstract":"This study was performed to develop a video based system which can be used to measure the averaged fish size in a non-intrusive fashion. The design was based on principles of simple stereo geometry, incorporated fish dimensions weight relationships and took into consideration fish movement to lower system costs. As the fish size is an important factor that impacts the economy of an aquaculture enterprise. Size measurements, including fork length, width or height, girth, thickness and mass, can be used to determine fish condition in the fish farm, so the averaged fish size of fish cage needs to consistently monitor in open ocean aquaculture cage. A precision of for replicate length measurements of a 60cm bar is obtained at distances between 2.0 and 6.0m, and the mean fork length and mean swimming speed of bluefin tuna were estimated to 48.8cm and 0.78FL/s, respectively.","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"53 23","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120821695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-08-31DOI: 10.3796/KSFT.2011.47.3.194
H. Cha, Sukyung Kang, J. Choi, T. Oh, Young-il Seo
was investigated based on the samplescaptured in South Korean waters from January 2008 to December 2009. Gonadosomatic index began toincrease in December , and reached maximum between January to March . After spawning it began todecrease from May . Reproductive season was estimated to January -April , with peak in February . Fecunditywas proportional to the size of the female , with the clutch size varying from 170,000 eggs in the smallestfemale (total length , 28.9 cm ) to 1,300,000 eggs in the largest (total length , 41.5 cm ). Size at 50% sexualmaturity (TL 50), determined from mature females , was 28.8 cm . Annual reproductive cycles of this speciescould be divided into six successive stages ; immature stage (May -October ), nucleolus stage (November -January ), yolk vesicle stage (January -February ), vitellogenic and ripe stage (January -April ) and spent stage(April -May ).Keywords: Maturation , Spawning , Annual reproductive cycle , Shotted halibut , Southern Korean waters
{"title":"Reproduction of the Shotted halibut in the southern Korean waters","authors":"H. Cha, Sukyung Kang, J. Choi, T. Oh, Young-il Seo","doi":"10.3796/KSFT.2011.47.3.194","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.3.194","url":null,"abstract":"was investigated based on the samplescaptured in South Korean waters from January 2008 to December 2009. Gonadosomatic index began toincrease in December , and reached maximum between January to March . After spawning it began todecrease from May . Reproductive season was estimated to January -April , with peak in February . Fecunditywas proportional to the size of the female , with the clutch size varying from 170,000 eggs in the smallestfemale (total length , 28.9 cm ) to 1,300,000 eggs in the largest (total length , 41.5 cm ). Size at 50% sexualmaturity (TL 50), determined from mature females , was 28.8 cm . Annual reproductive cycles of this speciescould be divided into six successive stages ; immature stage (May -October ), nucleolus stage (November -January ), yolk vesicle stage (January -February ), vitellogenic and ripe stage (January -April ) and spent stage(April -May ).Keywords: Maturation , Spawning , Annual reproductive cycle , Shotted halibut , Southern Korean waters","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123512978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-31DOI: 10.3796/KSFT.2011.47.2.128
Jae-Hyeong Yang, Sung Il Lee, S. Yoon, Jong-Bin Kim, Y. Chun, Kie-Young Park
In this study, energy budget was estimated to produce an efficient artificial seed. And it needs to enhance fisheries productivity of sandfish, A. japonicus. In order to estimate energy budget of the sandfish, A. japonicus juvenile fed on nonriched Artemia nauplii (NA) and the enriched Artemia nauplii (EA), of sandfish were reared at constant condition of seawater temperature of natural temperature (NT) and heated temperature (HT). During the reared period, energy used by the reared juveniles were calculated from estimates of data on ingestion, growth, oxygen consumption, nitrogen excretion and energy content. Energy budget of NT-NA, NT-EA, HT-NA and HT-EA were represented as 100C
{"title":"Energy budget of sandfish juvenile, Arctoscopus japonicus reared at different diet conditions and water temperature","authors":"Jae-Hyeong Yang, Sung Il Lee, S. Yoon, Jong-Bin Kim, Y. Chun, Kie-Young Park","doi":"10.3796/KSFT.2011.47.2.128","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.2.128","url":null,"abstract":"In this study, energy budget was estimated to produce an efficient artificial seed. And it needs to enhance fisheries productivity of sandfish, A. japonicus. In order to estimate energy budget of the sandfish, A. japonicus juvenile fed on nonriched Artemia nauplii (NA) and the enriched Artemia nauplii (EA), of sandfish were reared at constant condition of seawater temperature of natural temperature (NT) and heated temperature (HT). During the reared period, energy used by the reared juveniles were calculated from estimates of data on ingestion, growth, oxygen consumption, nitrogen excretion and energy content. Energy budget of NT-NA, NT-EA, HT-NA and HT-EA were represented as 100C","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115671627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-31DOI: 10.3796/KSFT.2011.47.2.099
Seung-jong Lee, Byung-Yeob Kim, D. Chang
),and oceanic condition in Korean waters were analyzed using 40 years of time-series data from 1971－2010.In the 1990s, oceanic conditions around the Korean peninsula shifted to awarmer regime with higher SST(sea surface temperature). The totalcatch of Spanish mackerelin Korean waters increased dramatically sincethe early 2000s, and main fishing ground form into South Sea in winter season from December to January.From the results of correlation analysis, we found asignificant relationship between the Spanish mackerelcatch and environmentalfactor such as SST , common mackereland anchovy catch in Korean waters.Keywords: Spanish mackerel, Korean waters, Catch, Increase, Oceanic conditions, Warmer regime
{"title":"Long -term variation in catch of Spanish mackerel (Scomberomorus niphonius ) related to environmental change in Korean waters","authors":"Seung-jong Lee, Byung-Yeob Kim, D. Chang","doi":"10.3796/KSFT.2011.47.2.099","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.2.099","url":null,"abstract":"),and oceanic condition in Korean waters were analyzed using 40 years of time-series data from 1971－2010.In the 1990s, oceanic conditions around the Korean peninsula shifted to awarmer regime with higher SST(sea surface temperature). The totalcatch of Spanish mackerelin Korean waters increased dramatically sincethe early 2000s, and main fishing ground form into South Sea in winter season from December to January.From the results of correlation analysis, we found asignificant relationship between the Spanish mackerelcatch and environmentalfactor such as SST , common mackereland anchovy catch in Korean waters.Keywords: Spanish mackerel, Korean waters, Catch, Increase, Oceanic conditions, Warmer regime","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125214375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-31DOI: 10.3796/KSFT.2011.47.2.088
Samkwang Cho, Bongjin Cha, Hyun-Young Kim
ˆE=3?7:3;A/9 47@67;5 D/@ 1/??732
{"title":"Catches of main species and bycatch according to the codend mesh sizes of stow net on anchor in the West Sea of Korea","authors":"Samkwang Cho, Bongjin Cha, Hyun-Young Kim","doi":"10.3796/KSFT.2011.47.2.088","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.2.088","url":null,"abstract":"ˆE=3?7:3;A/9 47@67;5 D/@ 1/??732 <BA A< 1<:=/?3 A63 1/A163@ <4 :/7; @=3173@ /;2 0F1/A16 /11<?27;5 A< A631<23;2 :3@6 @7G3 ?/@1639 \u000e:: \u000e:: \u000e:: \u000e:: <4 @A<D ;3A <; /;16<? 7; A63 1</@A/9 D/A3?@ <4’3<163<; /4A3? :/;B4/1AB?7;5 47C3 87;2@ <4 47@67;5 53/?@ /;2 1<::3?17/9 47@67;5 0</A \u0010\u0012 A<;@ D/@ B@324<? 7A \u0016;16<CF","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114157079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-31DOI: 10.3796/KSFT.2011.47.2.153
Seong-Wook Park, Hyeok-Jun Kwon, Seong-Kwae Park
The main purpose of this study is to understand the marketing approaches and strategies that are used todisseminating biodegradable fishing gears and distinguish the cognition and the non-cognition group′sattitudes on the product. We used a technology acceptance model for analyzing product attributes and itsimpacts on fishers' purchase. The result of this research shows that 'perceived usefulness and easiness of use'have positive effect on 'purchase intention,' and then give impacts on 'purchase intention' for the entirerespondents. For the cognitive respondents these factors have influence on 'attitude' but they do not affect'purchase decision.' However, 'perceived usefulness and easiness of use' have much positive impact on'purchase intention.' In the non-cognition group, the 'perceived intention' and 'company and country ofmanufacturers' have direct positive effect on 'purchase intention' through 'attitude' and also 'on 'purchaseintention.' This research provides some meaningful policy implications on further development andtechnology marketing of biodegradable fishing gears.Keywords: Biodegradable fishing net, Technology marketing, Purchase intention and cognitive intention
{"title":"Enhancing social awareness of biodegradable fishing gears through technology marketing","authors":"Seong-Wook Park, Hyeok-Jun Kwon, Seong-Kwae Park","doi":"10.3796/KSFT.2011.47.2.153","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.2.153","url":null,"abstract":"The main purpose of this study is to understand the marketing approaches and strategies that are used todisseminating biodegradable fishing gears and distinguish the cognition and the non-cognition group′sattitudes on the product. We used a technology acceptance model for analyzing product attributes and itsimpacts on fishers' purchase. The result of this research shows that 'perceived usefulness and easiness of use'have positive effect on 'purchase intention,' and then give impacts on 'purchase intention' for the entirerespondents. For the cognitive respondents these factors have influence on 'attitude' but they do not affect'purchase decision.' However, 'perceived usefulness and easiness of use' have much positive impact on'purchase intention.' In the non-cognition group, the 'perceived intention' and 'company and country ofmanufacturers' have direct positive effect on 'purchase intention' through 'attitude' and also 'on 'purchaseintention.' This research provides some meaningful policy implications on further development andtechnology marketing of biodegradable fishing gears.Keywords: Biodegradable fishing net, Technology marketing, Purchase intention and cognitive intention","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134050872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-31DOI: 10.3796/KSFT.2011.47.2.139
Hyun-Young Kim, Bokyu Hwang, Yoo-Won， Lee, H. Shin, J. Kwon, Kyounghoon Lee
Hydro-acoustic survey was carried out to estimate a fish distribution at marine ranching area and aggregated fish schools at artificial reef area in Oeyeondo, Korea. The survey system was set up with DGPS system, scientific echo sounder (EK60, Simrad Co.), and ECDIS (Mecys. Co. LTD). A track survey and a random survey was respectively applied to the marine ranching area (474.4ha) and to the artificial reef area (within a radius of 300m). As the result, fish distribution and MVBS values in marine ranching area showed that created fisheries resources didn`t come to be abundant yet as to appear fish distribution in all of the area. In the artificial reef area, it was, however, able to detect many fish school signals on the top of and around artificial reefs and to confirm the luring effect of artificial reefs.
{"title":"Hydro-acoustic survey on fish distribution and aggregated fish at artificial reefs in marine ranching area","authors":"Hyun-Young Kim, Bokyu Hwang, Yoo-Won， Lee, H. Shin, J. Kwon, Kyounghoon Lee","doi":"10.3796/KSFT.2011.47.2.139","DOIUrl":"https://doi.org/10.3796/KSFT.2011.47.2.139","url":null,"abstract":"Hydro-acoustic survey was carried out to estimate a fish distribution at marine ranching area and aggregated fish schools at artificial reef area in Oeyeondo, Korea. The survey system was set up with DGPS system, scientific echo sounder (EK60, Simrad Co.), and ECDIS (Mecys. Co. LTD). A track survey and a random survey was respectively applied to the marine ranching area (474.4ha) and to the artificial reef area (within a radius of 300m). As the result, fish distribution and MVBS values in marine ranching area showed that created fisheries resources didn`t come to be abundant yet as to appear fish distribution in all of the area. In the artificial reef area, it was, however, able to detect many fish school signals on the top of and around artificial reefs and to confirm the luring effect of artificial reefs.","PeriodicalId":211073,"journal":{"name":"Bulletin of The Korean Society of Fisheries Technology","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124833036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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