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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean society of Fisheries Technology
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries Technology
Editor in Chief :
Volume & Issues
Volume 47, Issue 4 - Nov 2011
Volume 47, Issue 3 - Aug 2011
Volume 47, Issue 2 - May 2011
Volume 47, Issue 1 - Feb 2011
Selecting the target year
Sinking depth of tuna longlines related to mainline materials in the North Pacific Ocean
Jo, Hyun-Su ; Hwang, Seon-Jae ; Lee, Ji-Hoon ; An, Doo-Hae ; Moon, Dae-Yeon ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 173~182
DOI : 10.3796/KSFT.2011.47.3.173
The purpose of this paper is to provide useful information for fishermen in the manner of investigation a sinking speed of current type tuna longline gear at the North Pacific Ocean as a new developed tuna longline fishing ground. The sinking depth of mainline in connection with different basket was investigated. The experiments were also performed with different materials such as Supermansen (i.e., PE) and Hitech (i.e., PA) for the mainline to investigate the sinking depth of mainline and hooks. Furthermore, the relation between the sinking depth of hooks and catches are investigated also. The sinking depth of mainline at the first and the last shooting basket shows deeper than that of middle part of a basket due to reduced shortening ratio. The sinking depth of mainline and hook with Hitech material shows more shallow than that of Supermanse material, even the Hitech case was designed to sink deeper than that of Supermanse case. The highest catches arise at the middle part basket as the hook number 7 with around 248m sinking depth. From the results, longline with Hitech material is needed to increase the sinking force for reaching the relevant sinking depth. Moreover, the current strength at the North Pacific Ocean will be considered for further commercial fishing.
Catching efficiency of LED fishing lamp and behavioral reaction of common squid Todarodes pacificus to the shadow section of color LED light
An, Young-Il ; Jeong, Hak-Geun ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 183~193
DOI : 10.3796/KSFT.2011.47.3.183
This study made a comparative analysis of behavioral reaction of squid to red (624nm), green (524nm), blue (460nm) & white LED light, its arrival time for the shadow section by making the shadow section in the central section of a water tank just like the bottom part of a squid jigging vessel, and on-site catching efficiency of LED fishing lamp with control fishing vessel. The color LED light showing the highest squidgathering rate as against the shadow section was found to be blue LED light with 39.3% rate under the dark (0.05lx) condition. Under the brighter condition than 0.05lx, white LED light was found to have the highest gathering rate of 41.5%. In addition, it was found that squid gathering rate was high at the shadow section which showed 6.3-fold brightness difference between the shadow section and bright section. As for the arrival time for the shadow section, blue LED light was found to be the fastest in attracting squids in 192.7 seconds under the dark condition while the red LED light was the fastest in luring squids in 164.6 seconds under the bright condition. The ratio of the squid-jigging operation and sailing in fuel consumption of the fishing vessel loaded with LED fishing lamp is about 7 to 1, showing most of the fuel is consumed more in sailing than in squid-jigging operation. As for a catch of squid, the control vessel loaded with MH (Metal Halide) fishing lamp had more catch of 600-7,080 squids than the vessel loaded with LED fishing lamp having a catch of 260-1,700 squids. In addition, even in the comparison of a catch per automatic jigging machine, the catch of the vessel loaded with MH fishing lamp excelled that of the vessel loaded with LED fishing lamp in 6 operations of squid jigging out of 9 operations. The ratio of hand-jigging and automatic jigging machine (one line) in the LED fishing lamp vessel was 1:1.1 excepting the case of having a catch only using an automatic jigging machine, showing almost the same with each other in catches, while in case of a MH fishing lamp vessel, its ratio against hand-jigging was 1 to 5.8, showing hand-jigging excelled in catches.
Reproduction of the Shotted halibut in the southern Korean waters
Cha, Hyung-Kee ; Kang, Su-Kyung ; Choi, Jung-Hwa ; Oh, Taeg-Yun ; Seo, Young-Il ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 194~202
DOI : 10.3796/KSFT.2011.47.3.194
Maturation and spawning of the Shotted halibut, Eopsetta grigorjewi was investigated based on the samples captured in South Korean waters from January 2008 to December 2009. Gonadosomatic index began to increase in December, and reached maximum between January to March. After spawning it began to decrease from May. Reproductive season was estimated to January-April, with peak in February. Fecundity was proportional to the size of the female, with the clutch size varying from 170,000 eggs in the smallest female (total length, 28.9cm) to 1,300,000 eggs in the largest (total length, 41.5cm). Size at 50% sexual maturity (TL50), determined from mature females, was 28.8cm. Annual reproductive cycles of this species could 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).
Age and growth of the flathead grey mullet (Mugil cephalus) in the coastal water of Yeosu
Zhang, Chang-Ik ; Park, Hee-Won ; Kwon, Hyeok-Chan ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 203~213
DOI : 10.3796/KSFT.2011.47.3.203
The age and growth of flathead grey mullet, Mugil cephalus, were studied using samples collected from the coastal water of Yeosu from September 2009 to August 2010. Spawning season estimated from the gonadosometic index (GSI) was from November to January. A method for increasing the readability of the otolith was described and criteria for the interpretation of otolith was provided. The annual ring was formed in September once a year. Annual ring in otolith for flathead grey mullet is validated for fish aged 1-8 using the marginal increment analysis. Using the sectioned otolith, between reader precision was 84%. Also, Within-reader agreement for sectioned otolith age readings was higher (reader 1
Measurement of size and swimming speed of Bluefin tuna (Thunnus thynnus) using by a stereo vision method
Yang, Yong-Su ; Lee, Kyoung-Hoon ; Ji, Seong-Chul ; Jeong, Seong-Jae ; Kim, Kyong-Min ; Park, Seong-Wook ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 214~221
DOI : 10.3796/KSFT.2011.47.3.214
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.
The application of GIS in analyzing acoustical and multidimensional data related to artificial reefs ground
Kang, Myoung-Hee ; Nakamura, Takeshi ; Hamano, Akira ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 222~233
DOI : 10.3796/KSFT.2011.47.3.222
This study is for the multi-dimensional analysis of diverse data sets for artificial reefs off the coast of Shimonoseki, Yamaguchi prefecture, Japan. Various data sets recorded in artificial reefs ground were integrated in new GIS software: to reveal the relationships between water temperature and fish schools; to visualize the quantitative connection between the reefs and the fish schools; and to compare the seabed types derived from two different data sources. The results obtained suggest that the application of GIS in analyzing multi-dimensional data is a better way to understand the characteristics of fish schools and environmental information around artificial reefs and particularly in the evaluation of the effectiveness of artificial reefs.
Auditory Characteristics of Tiger shark Scyliorhinus torazame caught in the Coast of jeju Island
Ahn, Jang-Young ; Choi, Chan-Moon ; Lee, Chang-Heon ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 234~240
DOI : 10.3796/KSFT.2011.47.3.234
In order to obtain the fundamental data about the behavior of sharks by underwater audible sound, this experiment was carried out to investigate the auditory characteristics of tiger shark Scyliorhinus torazame which was caught in the coast of Jeju Island by heart rate conditioning method using pure tones coupled with a delayed electric shock. The audible range of tiger shark extended from 80Hz to 300Hz with a peak sensitivity at 80Hz including less sensitivity at 300Hz. The mean auditory thresholds of tiger shark at the frequencies of 80Hz, 100Hz, 200Hz and 300Hz were 90dB, 103dB, 94dB and 115dB, respectively. The positive response of tiger shark was not evident after the sound projection of over 300Hz. At the results, the sensitive frequency range of tiger shark is narrower than that of fish that has swim bladder. In addition, it is assumed that the most sensitive frequency in auditory thresholds of Chondrichthyes is lower than that of Osteichthyes. Critical ratios of tiger shark measured in the presence of masking noise in the spectrum level range of about 60-70dB (0dB re
) increased from minimum 27dB to maximum 39dB at test frequencies of 80-200Hz. The noise spectrum level at the start of masking was distributed at the range of about 65dB within 80-200Hz.
Stability of the offshore large purseiner in Korea
Ham, Sang-Jun ; Kang, Il-Kwon ; Kim, Hyung-Seok ; Jo, Hyo-Jae ; Kim, Jung-Chang ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 241~247
DOI : 10.3796/KSFT.2011.47.3.241
Marine casualties of vessel are said to be in most case caused by human error, but it would be valid for the assumption that the ship is built with high quality and then should be acceptable to the safety standards. It means that the inherent characteristics of a ship should be the first consideration on the safety of ship. Therefore it is basically necessary for navigator to grasp the inherent stability of his ship and ensure that the ship complies with the minimum statutory standards of stability. This study is to realize the stability of the Korean offshore large purseiner varying with loading conditions by the inclining data and some calculations. The author compared the stability of the ship with IMO criteria and domestic rule, and proposed some improvement for the safety of the ship. The results are summarized as follows ; The values of GM of the ship according to the loading condition in navigation satisfy both of the IMO criteria and the domestic rule, but in case of the area under the GZ curves between the heel angles of
, and the heel angle occuring the maximum righting lever not satisfy the IMO rule at the fishing ground departure and arrival conditions in the haul in net situation. The initial metacentric height of the ship is very large, but the range of stability and the occurring angle of the maximum GZ are very small, so even small inclining can bring about the beam end. The best method of improvement for that is to increase the freeboard of the model among the variables.
Roll reduction characteristics of the offshore large purseiner in Korea
Kang, Il-Kwon ; Kim, Hyung-Seok ; Jo, Hyo-Jae ; Kim, Jung-Chang ; Ham, Sang-Jun ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 248~256
DOI : 10.3796/KSFT.2011.47.3.248
The inherent efficiency of a ship would be prior to any other quality factors in ship`s safety, because lack of it may give rise to a serious sea casuality even if it were a light mistake in operation. And the representative casualty comes from a deficiency of stability and an operating error combined would be capsizing. The Korean offshore large purseiner looks to have a structural weak point with small range of stability in spite of her big initial metacentric height, and have various type of roll reduction devices in order to cover up the defect. The aim of this study is to grasp for the roll reduction characteristics of the purseiner with bilge keel only and a stern keel additionally attached. The results are summarized as follows; The rolling angle of the model ship was increased in accordance with increase of the wave period and height, especially at close to the natural wave period of her, and the trends were more distinguished in the situation of bilge keel only installation than in the stern keel additionally installed. And stern keel has not noticeable effect on the reduction of the roll in the light ship condition, but has a little effect in full load condition.
The prediction of floating position of human model after wearing life-jacket based on the three dimensional modeling
Bi, Chong-Song ; Kim, Dong-Joon ; Park, Jong-Heon ; Min, Kyong-Cheol ; Lee, Jae-Sang ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 257~266
DOI : 10.3796/KSFT.2011.47.3.257
Recently, the manufacturers of life-jacket are very interested in the acquisition of USCG(US Coast Guard) approval because the acquisition of USCG approval has an important role in the purchasing decision of the buyer`s. Be based on criterion of USCG, we studied how to predict the change of floating position of human model with life-jacket to verify the backside restore. For this, in this study, the human model and the lifejacket was modeled in three dimension, the application program for prediction of floating position was developed, and plugged-in commercial program.
Behavior of abrasive wear on counterpart roughness of glass fiber reinforcement polyurethane resin composites
Kim, Hyung-Jin ; Koh, Sung-Wi ; Kim, Jae-Dong ;
Journal of the Korean society of Fisheries Technology , volume 47, issue 3, 2011, Pages 267~272
DOI : 10.3796/KSFT.2011.47.3.267
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.