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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 40, Issue 4 - Nov 2004
Volume 40, Issue 3 - Aug 2004
Volume 40, Issue 2 - May 2004
Volume 40, Issue 1 - Feb 2004
Selecting the target year
A Study on Behaviour of Giant Pacific Octopus, Parotopus dofleini to Single Line Hook for Hook Design
Park, Seong-Wook ; Lee, Jeong-Woo ; Yang, Yong-Su ; Seo, Du-Ok ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 1~8
DOI : 10.3796/KSFT.2004.40.1.001
The single line hook fishery for giant pacific octopus, Parotopus dofleini is one of the important in coastal Kangwon-do of Korea, where was caught an average of 4,000 ton during the period of 1996~2000. The fishing gear is consisted of a single buoy line, a buoy and a hook. In this study, the responses of giant pacific octopus to single line hook gear were examined in an experimental tank using a video camera in order to know hooking mechanism and improve hook. Giant pacific octopus tend to envelop the bait with their arms by rush or slowly swimming towards it. When they rush to the bait, they show much feeding behaviour as withdrawing after enveloping the bait using two arms. But when they approach with slowly swimming to bait, they show feeding behaviour as stopping after enveloping the bait using one arm. and then, the highly hooking rate appeared more often in the case of latter then former. The average feeding time on a sardine, giant pacific octopus and pork fat showed the range of 1 to 30 min, 10 to 50 min, and 50 min to over 1 hour, respectively. This indicates that it takes longer time for giant pacific octopus to eat the tough meat than the soft meat. The performance concerned with hooking showed that the 'B' type hook with a short shank was more favorable than the 'A' type hook with a long shank. However, the 'A' type hook has the advantage of easy dropping out caught octopus, compared to the 'B' type.
Population Dynamics of Smoothshell Shrimp, Parapenaeopsis tenella from the Coastal Area of Geomun-do, Korea
Oh, Taek-Yun ; Cha, Hyung-Kee ; Choi, Jung-Hwa ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 9~16
DOI : 10.3796/KSFT.2004.40.1.009
Parapenaeopsis tenella occurs widely on the south and west coasts of Korea. Sex ratio showed seasonal variations, with a mean value of 48.6% for the females. The species produces one cohort a year, with the ovaries ripening from July to August. Insemination took place from July to August, as more than half of the females sampled in the study over 14 mm CL were inseminated. Gonadosomatic index (GSI) reached the maximum between July and August. The smallest mature female was 11 mm CL. Size at 50% sexual maturity (
), determined from both mature females and inseminated females, was 12.53 mm and 12.28 mm CL, respectively. The life span of females appeared to be 14-15 months according to size frequency distributions, while that of the male was 13-14 months. Population growth was estimated by the modified von Bertalanffy growth function incorporating seasonal variation in growth. Based on the growth parameters (K = 1.22
= 21.99 mm CL for females, and K = 2.00
= 15.00 mm CL for males) growth curves showed that females grew faster and reached a larger size at age than males.
An Experimental Study on the Improvement of Resistance Performance at Pre-planing Condition for G/T 100 ton Class Planing Hull Form
Lee, Kwi-Joo ; Joa, Soon-Won ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 17~22
DOI : 10.3796/KSFT.2004.40.1.017
This study was carried out at the CWC of Chosun university for the purpose of resistance performance improvement of planing hull, and the results of the tests were confirmed cooperatively with WJFEL. G/T 100 ton class planing hull form was selected, and the improvement of hull form including appendages were performed by using some model test techniques. The model test scope comprises resistance relative tests including wave profile observation, trim and sinkage measurement and flow visualization tests at full load and trial conditions for one bare hull and for two appended hulls. The final wedge and spray strip combined with improved hull form showed about 1.0 knot speed improvement at both of full and trial conditions, and outstanding improvement for fore wave phenomena.
Transmittance Properties of Fishing Lamp in Stick-held Dip Net Fishing Vessel for Pacific Saury
Jo, Hyun-Su ; Kim, Doo-Nam ; Cho, Young-Bok ; Lee, Ju-Hee ; Kim, Hyung-Seok ; Yang, Won-Seok ; An, Heui-Chun ; Han, Jin-Seok ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 23~28
DOI : 10.3796/KSFT.2004.40.1.023
The transmittance properties of fishing lamp in stick-held dip net fishing vessel for Pacific saury was investigated during nighttime operations in the North Pacific on May 19 and 24, 2003. The incandescent lamps of red color (750W
100) and halogen lamps (750W
521) were used as a fishing lamp for gathering Pacific saury. The relative irradiance of red incandescent lamp and halogen lamp in the air showed peak in 1,052nm of wave length. However, the irradiance of halogen lamp below 600nm of wave length was higher than that of incandescent lamp. The relationship between underwater illuminance (Y) and water depth (X) of sunlight in the observation areas A (37
46'W) and B (31
01'E) is represented as follows;
The distribution of underwater illuminance of observation areas A and B showed low value of 0.31x and 0.61x in 50m depth, respectively. In the fishing grounds of Pacific saury, the light intensity of distribution depth was above 0.51x.
An Analysis on the Sinking Resistance of Purse Seine - 2. In the Case of the Model Purse Seine with Different Netting Material and Sinkers -
Kim, Suk-Jong ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 29~36
DOI : 10.3796/KSFT.2004.40.1.029
This study deals with an analysis on the sinking resistance for the model purse seine, in the case of different netting material and sinkers. The experiment was carried out using rune simplified model seines of knotless nettings. Dimension of model seines 420cm for corkline and 85cm for seine depth, three groups of models rigged 25, 45 and 60g with the same weighted sinkers in water were used. These were named PP-25, PA-25, PES-25, PP-45, PA-45, PES-45, PP-60, PA-60 and PES-60 seine. The densitie(
) of netting materials were 0.91g/cm
. Experiments carried out in the observation channel in a flume tank under still water conditions. Sinking motion was recorded by the one set of TV-camera for VTR, and reading coordinate carried out by the video digitization system. Differential equations were derived from the conservation of momenta of the model purse seines and used to determine the sinking speeds of the depths of leadline and the other portions of the seines. An analysis carried out by simultaneous differential equations for numerical method by sub-routine Runge-Kutta-Gill The results obtained were as follows : 1. Average sinking speed of leadline for the model seines rigged 60g with the same weighted sinkers in water was fastest for 12.2cm/sec of PES seine, followed by 11.4cm/sec of PA and 10.7cm/sec of PP seines. 2. The coefficient of resistance for netting of seine was estimated to be
3. The coefficient of resistance for netting bundle of seine was estimated to be
4. In all seines, the calculated depths of leadline closely agreed with the measured ones, each 25g, 45g, 60g of weighted sinkers were put into formulas meas.=1.04cal., meas.=0.99cal. and meas.=0.98 cal.
Studies on the Development of the Fishing System of Set Net in the Coast of Jeju Island 3. The Mode| Experiment of Fyke Net for Construction Improvement
Kim, Suk-Jong ; Koo, Myung-Sung ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 37~46
DOI : 10.3796/KSFT.2004.40.1.037
In order to increase fishing efficiencies of the fyke net used in the coast of Jeju Island, water tank experiment was caried out entering and escaping behavior using nets that were reduced to 1/20 of the size of the full scale fyke net and were improved to have antrance structure, and mackerel Scomber japonicus as experimental fish. The results of measurement are as follows : 1. Fish school behavior in the main net was showed two different patterns : swimming in a circle in the right space of the main net and swimming back and forth in ellipse in the right and left space. 2. The swimming speed of mackerel school was 23.9. 12.6 and 32.0cm/sec in the center space, right space of main net and in the mouth 3. The entering rate of fish school was 40% in net with 35cm length of the upper and funnel net in the mouth of fyke model net and 49% in conventional type fyke model net. 4. The escaping rate of fish school was 10% in net with 35cm length of the upper and funnel net in the mouth of fyke model net and 69% in conventional type fyke model net. 5. The remain rate of fish school was 90% in net with 35cm length of the upper and funnel net in the mouth of fyke model net and 31% in conventional type fyke model net.
Signal Coverages of DGPS Beacon Stations in Korea
Ahn, Jang-Young ; Choi, Chan-Moon ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 47~53
DOI : 10.3796/KSFT.2004.40.1.047
For the purpose of comparison between the designed coverage and actual coverage of Korean DGPS (Differential Global Position System) beacon stations, we have received the ship‘s positions with states and IDs of their stations on the navigation route of Jeju-Tianjin by automatic selection mode of DGPS receiver and on them of Jeju-Inchun and Jeju-Vladibostok by manual mode. Also in case that some obstructions were on propagation routes from DGPS beacon stations to receiving positions, a restriction on available ranges of DGPS beacon signals was investigated. The results obtained are as follows : 1. The coverage of Korean DGPS beacon stations was designed 100NM (Nautical mails) at 40.0dB(over
V/m). But the actual coverages of them according to their stations and propagation routes were 0.3-3.6 times as wide as designed coverage. 2. In case that the propagation route of beacon signals from DGPS beacon stations was on the sea, the propagation distance of north direction from the stations was longer than south direction. 3. The coverages of Echongdo and Ulungdo stations were 366NM on the yellow sea and 342.3NM on the east sea of Korea respectively, and were widest than any other stations. 4. The coverage of Marado station on the south and yellow seas of Korea was very unstable because of the Halla mountain on the propagation route. Maximum receiving range to be measured by automatic selection mode of DGPS receiver was 145NM on the route of Jeju-Tianjin on June 22-July 1, 2002. Minimum receiving range to be not measured by manual selection mode was 28.7NM on the route of Jeju-Inchun on June 26-28, 2003
A Basic Study for Utilization of Autopilot System Using Electromagnetic Compass in a Small Fishing Boat
Jo, Hyeon-Jeong ; Lee, Yoo-Won ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 54~59
DOI : 10.3796/KSFT.2004.40.1.054
Experiments were carried out to measure the variation of the compass error on ship's head up bearing by magnetic compass and electromagnetic compass on berthing at the pier in order to obtain a basic information on the utilization of autopilot system using electromagnetic compass in fishing boat. The wooden fishing boat, turned on attracting fish lamps of power consumption 85kW, steering magnetic compass and electromagnetic compass indicated westerly compass error with 7
respectively. The FRP fishing boat, turned on attracting fish lamps of power consumption 130kW, electromagnetic compass indicated easterly compass error 19
. The steel fishing boat, turned on ship's navigation equipments of power consumption 225kW, steering magnetic compass indicated westerly compass error with 16
. While the difference of compass error using electromagnetic compass indicated westerly compass error with 68
on the upper deck when the navigation and fishing equipment turn on compare to turn off the equipment, it had easterly compass error with 16
on the forecastle deck, wheel house and compass deck respectively.
Composition of Marine Organisms Caught from Lost Plastic Pot and Possibility of Sustainable Ghost Fishing
Jeong, Sun-Beom ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 60~64
DOI : 10.3796/KSFT.2004.40.1.060
The reason of the loss for the plastic sea-eel pots were estimated as crew's mistake, strong current, bad weather, rough seabed, artificial reef and other boats' fishing. Especially, pot loss happened on the fishing could make some additional catch, loss of the catches and ghost fishing because there are baits and alive fish in the lost pot. Quantity of the lost pots was estimated as 2~4 times of the ordinary usage. On the result of investigation to analyze the possibility of sustainable ghost fishing for the lost pot to feed the fishes at anytime because there were blenny, silver whiting, bar-tailed flathead and shrimp including sea-eel in the lost pot. In the bioeconomic point, ghost fishing is competitive with the general fishing. Accordingly, usage of biodegradable plastic material for the plastic sea-eel pot will be better to reduce ghost fishing
On the Motion Characteristics of Small Trawler under Operation
Lee, Chun-Ki ; Kang, Il-Kwon ; Kim, Jeong-Chang ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 65~72
DOI : 10.3796/KSFT.2004.40.1.065
This paper deals with an experimental study on the dynamical characteristics of ship motion during trawling job on the real sea. The experiments were carried out on the small stern trawler, and roll and pitch motion of the ship according to the wave directions were simultaneously recorded by P/C in the same sea conditions. From these data, the statistical properties and power spectra were obtained, and then the analysis of ship motion in trwal job was made. As a result, it was found that the pitch motions in trwal job were displayed low amplitudes on the whole, but the rolling motions were displayed high amplitudes relatively, and very high value on the beam and quartering sea especially. Also, the trial ship has a high extinction coefficient in the roll motion, compared with the rule of stability, but when wave height takes 2.5m over, it can induce the safety of ship to scare occasionally. Therefore, a usefull countermeasure for the safety of ship has to be made adequately.
A Study on the Hydrodynamic Interaction Forces between Ship and Bank Wall in the Proximity of Bank
Lee, Chun-Ki ; Kang, Il-Kwon ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 73~77
DOI : 10.3796/KSFT.2004.40.1.073
It is well known that the hydrodynamic interaction forces between ship and bank wall affect ship manoeuvring motions. In this paper, the calculation method based on the slender body theory for estimation of the hydrodynamic interaction forces between ship and bank wall is investigated. The numerical simulations on hydrodynamic interaction force acting on a ship in the proximity of bank wall are carried out by using this theoretical method. The theoretical method used in this paper will be useful for practical prediction of ship manoeuvrability at the initial stage of design, for discussion of marine traffic control system and for automatic control system of ship in confined waterways.
Verification of Practicality for the SSBL and Pinger Synchronizing Biotelemetry Method and System through the Tracking of Fish
Park, Ju-Sam ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 78~85
DOI : 10.3796/KSFT.2004.40.1.078
The new biotelemetry method and system that the installation and the treatment of equipment is convenient and the instantaneously detailed position of the fish attached a pinger is able to track comparatively easily had been developed, an practicality of it were verified in the water tank and the small sea port through the tracking of fish. The biotelemetry method had been gotten the three dimensional locations of fish to the receiving transducer by combining of the super short base line (SSBL) method to detect the direction of pinger and the pinger synchronizing method to measure the range from receiving transducer to pinger. The receiving system had been designed to realize the high precision or wide detection range by application of the basic design method for receiving system of biotelemetry and the hydrophone array configuration. From tracking test of carp in the water tank, the migration course and the velocity of carp was investigated and the observed migration course was compared with measurement. The measured migration course of carp coincided with the observation in the main and the position of carp was able to track three dimensionally. The velocity of carp measured by the moving average method was 11.2cm/s. From tracking test of yellowtail in the small sea port, the migration course and the velocity of yellowtail was investigated at natural condition. The position of yellowtail was able to track three dimensionally and the velocity of it measured by moving average method was 43.9cm/s.
Mesh Selectivity of Beam Trawl for Shrimps
Oh, Taek-Yun ; Cho, Young-Bok ; Park, Gwang-Jei ; Jeong, Sun-Beom ; Kim, Min-Seok ; Kim, Hyeong-Seok ; Lee, Ju-Hee ;
Journal of the Korean society of Fisheries Technology , volume 40, issue 1, 2004, Pages 86~94
DOI : 10.3796/KSFT.2004.40.1.086
This study was conducted to mesh selectivity of Beam trawl for shrimps fishing experiment in the coastal waters around Geomundo, South sea of Korea, during from Oct. to Nov. 2002. The selectivity parameters of big head shrimp (Solenocera melantho) have been studied on the covered con-end method. with mesh of 8, 38, 51 and 61 mm. Selection curves and selection parameters were calculated by using a logistic function S=1/(1+exp-(aCL+b)). The mesh selection master curves were estimated by S=1/(1+exp
), and the optimum mesh size were calculated with (L/M)50 of master curve. Optimum mesh size and selectivity master curves for the southern rough shrimp (Yrachysalambria curvirostris) and smoothshell shrimp (Parapenaeopsis tenella) optimum mesh size and selectivity master curves were estimated by big head shrimp master curves. The results obtained are summarized as follows : Selection parameters '
' and '
' of the master curve for big head shrimp were 8.84 and -5.89, and The selection factor of the master curve (L/M)
was 0.67. The optimum mesh size of minimum length for sexual maturity for big head shrimp was 30.7 mm. Estimated (L/M)
for southern rough shrimp and smoothshell shrimp by using the master curve of big head shrimp was 0.73 and the optimum mesh sizes were 25.5 mm for southern rough shrimp and 16.9 mm for smoothshell shrimp, respectively.