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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 50, Issue 4 - Nov 2014
Volume 50, Issue 3 - Aug 2014
Volume 50, Issue 2 - May 2014
Volume 50, Issue 1 - Feb 2014
Selecting the target year
Difference of tension on mooring line by buoy type
Lee, Gun-Ho ; Kim, In-Ok ; Cha, Bong-Jin ; Jung, Seong-Jae ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 233~243
DOI : 10.3796/KSFT.2014.50.3.233
The difference of mooring tension by type of buoy was investigated in the circulating water channel and the wave tank for deducting the most stable buoy from the current and the wave condition. 5 types of buoy made up of short cylinder laid vertically (CL-V), short cylinder laid horizontally (CL-H), capsule (CS), sphere (SP) and long cylinder (CL-L) were used for experiments. A mooring line and a weight were connected with each buoy. A tensile gauge was installed between a mooring line and a weight. All buoy's mooring tension was measured at the same time for the wave test with periods of 1.5~3.0 sec and wave heights of 0.1~0.3 m, and the current test with flow speeds of 0.2~1.0 m/sec. As a result, the order of tension value in the wave test was CL-H > CL-V > SP > CS > CL-L. In the current test CL-V and CL-H were recorded in the largest tension value, whereas SP has the smallest tension value. So it seems that SP buoy is the most effective in the location affected by fast current. CS is predicted to be suitable for a location that influence of wave is important more than that of current if practical use in the field is considered. And it was found that the difference of mooring tension among buoys in wave is related to the product of the cross sectional area and the drag coefficient for the buoy's bottom side in high wave height. The factor for the current condition was not found. But it was supposed to be related to complex factors like a dimension and a shape by buoy's posture to flow.
Acoustical characteristics of prototype mechanical white noise generator as an underwater sound source
Shin, Hyeon-Ok ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 244~251
DOI : 10.3796/KSFT.2014.50.3.244
This paper describes a prototype mechanical white noise generator has a source level of more than 170.0 dB (re
at 1 m) at the frequency range of 10 Hz to 100 kHz. The results of performance evaluation of the generator are as follows. The average source level of the generator measured by a step of
in horizontal (0 to
, 25 points) was 185.2 (SD (standard deviation): 2.3) dB (re
at 1 m). The maximum and minimum source levels were appeared at the frequency range of 2.5 to 5.0 kHz and around 100 kHz, respectively. The average source levels at
were 162.9 (SD: 10.6), 168.4 (SD: 10.0), 162.1 (SD: 9.1) and 166.5 (SD: 11.1) dB (re
at 1 m). The average source level measured by a step of
in vertical was 184.9 (SD: 2.2) dB (re
at 1 m). The relative maximum variation width of the source levels in horizontal and in vertical measurement were less than 7.0 dB and 1.0 dB, respectively.
The main factor and counterplan for marine casualties of fishing vessel according to the type of fishing job in Korea
Park, Byung-Soo ; Kang, Il-Kwon ; Ham, Sang-Jun ; Park, Chi-Wan ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 252~261
DOI : 10.3796/KSFT.2014.50.3.252
Marine casualties originated from fishing vessel occupied about 70% of the whole marine casualties in Korea from 2001 to 2010, this ratio was not much changed as it was before. Therefore a pragmatic counterplan to decrease of casualties in fishing vessel is indispensable for reduction of the nationwide marine casualties. But since the casualties occurred by fishing vessel may have a different causes and counterplan according to the operating type of it, in this paper, fishing vessels classified into 12 types by operating method and inspected the causes and counterplan for that. The operating type of fishing vessel occurred the specific casualties more were jig boat in collisions and fire explosion, trap fishing boat, mixed fishing boats and inshore gill netter in collisions, stow netter in machinery damages and capsizing, offshore gill netter in machinery damages, fish carrier in collisions. It must be emphasized that the higher ranked types of vessels, especially jig boat have to take special care to the approaching vessels under way, trap fishing boat to rear look out and mixed fishing boat must keep on safety speed and be taken an education for advance the skill of operating radar as well. For all 12 types of fishing vessel, it is necessary for an operator to make strict precaution on the other vessel under way systematically and keep the regulation for preventing collisions, and for an engineer on watch to make a check the electricity and the engines periodically for reduction the fire explosion and machinery damages.
Catching efficiency of biodegradable trap for swimming crab (Portunus trituberculatus) in the western sea of Korea
Kim, In-Ok ; Lee, Gun-Ho ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 262~273
DOI : 10.3796/KSFT.2014.50.3.262
To investigate the catching efficiency of a biodegradable round trap for a swimming crab (Portunus trituberculatus), four types of material (two types of biodegradable net, one type of biodegradable plus polyethylene net and one type of polyethylene net) for traps were used in the field test, and the field tests were carried out 11 times in the Boryeong fishing ground of Korea, 2012~2013. The catching efficiency of four type traps was analyzed by catch per trap, weight per trap and mean weight per individual of small and large size swimming crab. Statistical Kruskal-Wallis test was carried out to verify the significant difference for the efficiency between types of material. The catch in number of swimming crab was 9,015 and formed about 94.3% of total catch. In the results of catching efficiency of traps, there was a little difference in catch per trap, weight per trap and mean weight per individual of swimming crab in-situ data. But there was no significant difference in catching efficiency between the biodegradable traps and the PE trap (P>0.05), so it's needed to use widely a biodegradable trap for the conservation and sustainable management of swimming crab resources.
Effects of steam heat treatment conditions on the swelling and physical properties of PBS (polybutylene succinate) copolymer monofilament gill net
Park, Seongwook ; Kim, Seonghun ; Do, Choonho ; Lim, Jihyun ; Choi, Haesun ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 274~283
DOI : 10.3796/KSFT.2014.50.3.274
Swelling of the heat-treated netting for gillnet was estimated through the netting height in square acrylic tank. Experimental Nylon netting and PBSAT netting were heat-treated by using the high-degree vacuum method in hot water after net making. Heat-treatment temperatures were conducted with Nylon netting
and PBSAT netting
. The swelling measurement method of a netting using the square tank was capable of the reduction measurement errors comparing with measurement methods of a mesh inner angle and the shortening rate of a mesh size. In addition, this method was available to comparison evaluation for each netting more easily. Wet type heat-treatment apparatus with high-degree vacuum was shown higher
inner side temperature than a setting temperature. The tensile strength and elongation of Nylon netting and PBSAT netting were shown higher wet condition than dry condition. The tensile strengths of PBSAT monofilaments in dry and wet condition were sharply decreased at heat-treatment temp.
than heat-treatment temp.
Mesh selectivity of a dome-shaped pot for finely-striate buccinum Buccinum striatissimum in the eastern coastal waters of Korea
Park, Chang-Doo ; Bae, Jae-Hyun ; Cho, Sam-Kwang ; Kim, In-Ok ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 284~291
DOI : 10.3796/KSFT.2014.50.3.284
Finely-striate buccinum Buccinum striatissimum, a species of whelks, is caught mainly by pot in the eastern coastal waters of Korea. In order to determine the size selectivity of pot for the species, comparative fishing experiments were conducted near Yeongil Bay from June to September in 2003 using the dome-shaped pots with different five mesh sizes (17.1, 24.8, 35.3, 39.8, and 48.3 mm). The parameters of logistic equation were estimated by the SELECT (Share Each Length's Catch Total) method based on a multinomial distribution. The model with the estimated split parameter was found to fit the catch data best. The master selection curve was estimated to be s (R)=exp (13.044R-16.438)/[1 + exp (13.044R-16.438)], where R is the ratio of shell height to mesh size. The relative shell height of 50% retention was 1.260, and the selection range was 0.168. Enlargement in mesh size of the pot allows more small-sized whelks to escape.
The study of the calculation of energy consumption load for heating and cooling in building using the Laplace Transform solution
Han, Kyu-Il ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 292~300
DOI : 10.3796/KSFT.2014.50.3.292
The Laplace Transform solution is used as a mathematical model to analyse the thermal performance of the building constructed using different wall materials. The solution obtained from Laplace Transform is an analytical solution of an one dimensional, linear, partial differential equation for wall temperature profiles and room air temperatures. The main purpose of the study is showing the detail of obtaining solution process of the Laplace Transform. This study is conducted using weather data from two different locations in Korea: Seoul, Busan for both winter and summer conditions. A comparison is made for the cases of an on-off controller and a proportional controller. The weather data are processed to yield hourly average monthly values. Energy consumption load is well calculated from the solution. The result shows that there is an effect of mass on the thermal performance of heavily constructed house in mild weather conditions such as Busan. Building using proportional control experience a higher comfort level in a comparison of building using on-off control.
Comparison of fishing gears and catches by areas in the Gape net with wings in Jeonnam, Korea
Cho, Sam-Kwang ; Song, Dae-Ho ; Yoo, Joon-Taek ; Choi, Mun-Seong ; Cha, Bong-Jin ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 301~309
DOI : 10.3796/KSFT.2014.50.3.301
This study was carried out to compare the regional fishing gears and catches of the gape net with wings used in Jeonnam, Korea. The total length of the gear used in Yeosu, Wando and Jindo was 107.0m, 64.0m, 52.8m, and the size of codend was 4.3mm. 7.8mm. 9.8mm, respectively. The total number of bycatch species from anchovy (Engraulis japonicus) catches in Yeosu, Wando, and Jindo during the survey period were 21, 13, and 13 species. A total of individuals of anchovy accounted for over 90% out of total catches in all survey areas. The proportion of anchovy individuals was constantly high up to October in Yeosu, but it showed a sharp reduction to 18% in October in Wando with the increase of the individuals of Kammal thryssa (Thryssa kammalensis) and Big eyed herring (Sardinella zunasi). In Jindo, individuals of anchovy occupied over 99.8% out of total catches up to August. Since August, the number of individuals of Big eyed herring (Sardinella zunasi), Kammal thryssa (Thryssa kammalensis), and Slimy (Leiognathus nuchalis) has increased while the number of anchovy individuals were decreased.
Physicochemical characteristics of mackerel and tuna viscera as baits for swimming crab Portunus trituberculatus pots
Koo, Jae-Geun ; Chang, Ho Young ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 310~317
DOI : 10.3796/KSFT.2014.50.3.310
This study was conducted to investigate the attractant substances of different solvent fractions of mackerel and tuna viscera. Mackerel and tuna viscera were extracted with methanol and the resultant were fractionated with n-hexane, chloroform, ethyl acetate, n-butanol and water. The chemical compounds such as free amino acid, fatty acid, nucleotide related compounds contents were estimated for mackerel, tuna viscera and various fractions. These fractions were also subjected to attracting experiments in water tank to estimate attracting effects. The aqueous fractions of mackerel and tuna viscera showed the highest attraction effect on swimming crab. The major chemical compounds of the aqueous fractions were histidine, taurine, cysteine, glutamic acid, inosine monophosphate (IMP) and inosine (HxR) for mackerel and arginine, glutamic acid, aspartic aid, alanine, IMP and hypoxanthin (Hx). Results indicated that higher polarity compounds, such as amino acid and nucleotide related compounds have higher attraction activities than nonpolar substances such as neutral lipid.
Collection characteristics of wet-type rotating porous disk system for air pollutants removal of marine diesel engines
Yoa, Seok-Jun ; Jang, Chang-Ik ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 318~325
DOI : 10.3796/KSFT.2014.50.3.318
The main object of this study is to investigate the collection characteristics of wet-type rotating porous disk system experimentally. The experiment is carried out to analyze the pressure drop and collection efficiency for the present system with the experimental parameters such as system inlet velocity, stage number, tube diameter, inlet concentration, etc. In results, for the present system, at 5 stage and
, the pressure drop becomes significantly lower as
in comparison with that of the conventional wet type scrubber (Venturi scrubber, over
). The collection efficiencies increase with higher inlet velocity showing 92, 95.7, 98.4%, while
removal efficiencies decrease with increment of inlet velocity as 80, 65, 50% at
, 1.44, 1.8 m/s and tube diameter
, respectively. The present system is to be considered as an effective compact system for a simultaneous removal of particle/gas phase pollutants from marine diesel engines.
Fishing efficiency of high capacity (360W) LED fishing lamp for squid Todarodes pacificus
An, Young-Il ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 326~333
DOI : 10.3796/KSFT.2014.50.3.326
This study was conducted to investigate the fishing efficiency of an improved LED fishing lamp for squids. A total of 31 fishing operations were carried out with six-crew commercial fishing vessel Haengbok-Ho (24 tons) on which 43.2kW LED was installed, along with 14 automatic jigging machines, from October 6 to November 16, 2012. The 19 fishing vessels with Haengbok-Ho were compared with a control subject was 24 tons or 29 tons. A total illuminating power of metal halide (MH) fishing lamps in the control fishing vessel was either 84kW or 120kW. The number of automatic jigging machines in the control vessels was 8-18 and the number of crews engaged for fishing operation was 3-13. Average fuel consumption of LED fishing vessels during fishing operation was 505.1l which led to an average fuel consumption of 42.7l per hour. LED fishing vessel and MH fishing vessel caught on an average 1,946 squids and 2,439 squids, respectively, during the study period. Crews (hand line and hand reel) caught about 2.2 times the automatic jigging machines for LED fishing vessel and about 2.1 times for MH fishing vessel. Meanwhile, catches by the fishing vessels with LED in the combined total number per one line of automatic jigging machine and per crew were 86.6% of that of the control fishing vessel with MH. Also, fishing vessels with LED per automatic jigging machine achieved 71.8% of catches of that with MH fishing lamp. The catches of squids per the fishing vessel with 1W LED fishing lamp were higher by more than 135.5% of that in the fishing vessel with MH, which showed a good fishing performance even with only the use of a LED fishing lamp.
Diet composition of juvenile Korean piscivorous chub, Opsariichthys uncirostris amurensis in the surf zone of Nakdong river estuary, Korea
Baeck, Gun Wook ; Huh, Sung Hoi ; Park, Joo Myun ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 334~341
DOI : 10.3796/KSFT.2014.50.3.334
The diet composition of juvenile Korean piscivorous chub, Opsariichthys uncirostris amurensis were studied using 277 specimens collected from January to December 2004 in the surf zone of Nakdong river estuary. The size of Opsariichthys uncirostris amurensis ranged from 2.6 to 9.1 cm in standard length (SL). Opsariichthys uncirostris amurensis was carnivore that consumes mainly amphipods and insects. Its diet also included small quantities of polychaetes, fishes, and algae and plants. Opsariichthys uncirostris amurensis showed ontogenetic diet change. Smaller individuals (< 4 cm SL) mainly consumed amphipods. The portion of these prey items decreased with increasing fish size, and this decrease was paralleled with increased consumption of larger preys such as polychaetes and fishes. Insects were preyed moderated values in all size classes. Opsariichthys uncirostris amurensis diet also showed diel change with consuming more on amphipods and polychaetes during day.
Effects on bycatch reduction in a shaking cod end generated by canvas in a shrimp beam trawl
Kim, Yonghae ; Whang, Dae-Sung ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 342~350
DOI : 10.3796/KSFT.2014.50.3.342
An active stimulating device, such as a fluttering net or canvas attached to the end of a cod end generating a shaking motion, could help to encourage the escape of juvenile fish positioned passively near the net. Field fishing trials using a shrimp beam trawl were carried out to examine the effect on the reduction of juvenile fish or other discard catch by generating a shaking movement of the cod end using an unbiased cap-like round canvas. The mean period of the shaking motion with the round canvas was ~14 s, and the mean amplitude was 0.4 m as measured by peak event analysis and the global wavelet method. The bycatch of juvenile fish in 14 trials decreased by ~30% and by ~25% using a steady cod end for the total bycatch using a shaking cod end in the shrimp beam trawl, while the marketing catch was similar between steady and shaking cod ends. There was no difference in the body size of the shrimp or fish and species composition between the steady and shaking cod ends. Above results demonstrate a new method for bycatch reduction using an active stimulating device, although more detailed studies are needed.
Opening efficiency and selectivity of Double-level type and Grid type in the shrimp beam trawl net
Jang, Choong-Sik ; Cho, Youn-Hyoung ; An, Young-Su ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 351~360
DOI : 10.3796/KSFT.2014.50.3.351
The experiments were carried out to decide the selective fishing gear of the shrimp beam trawl fishery. The model nets were made of General type, Double-level type and Grid type. The model experiments were carried out to test opening efficiency and towing tension. The experimental tanks were the flume tank [
] and the towing tank [
] in National Fisheries Research and Development Institute. The full scale experiments were carried out to compare the selectivity of General type net, Double-level type net and Grid type net in the southern sea of korea. The vertical opening (net height) of the model nets can be expressed as a function of the towing velocity as the straight line. The towing tension of the model nets can be expressed as a function of the towing velocity as the parabola. The shrimp catching rates of upper cod end in Boryeong and tongyeong were 78%, 9% respectively, but the rates of lower cod end were 23%, 91% respectively. The number bycatch rates of General type and Grid type were 23%, 11% respectively, and the weight bycatch rates were 34%, 31% respectively. A selective shrimp beam trawl net is Grid type in korea coastal sea.
A Status, problems and its solutions of the korean trawl fishery in New Zealand sea
Jang, Choong-Sik ; An, Young-Su ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 361~367
DOI : 10.3796/KSFT.2014.50.3.361
The aims of this study are to access the status and problems and draft possible solutions of Korean trawl fishery in New Zealand sea. The main target fish species for Korean trawlers in this sea were barracouta, blue mackerel, hake, hoki, jack mackerel, ling, oreo, orange roughy, southern blue whiting, spiny dogfish, squid and silver warehou. The Korean trawl fishery are suffering from a supply of seaman, continuous increasing coast of the counter partner, repair of vessel and seaman supply. It may be useful for getting over these difficulties to build a new trawler with a automatic operation system.
Fishing characteristics of small yellow croaker drift gill net by net height
Oh, Taeg-Yun ; Cho, Young-Bok ; Seo, Young-Il ; Kim, Byung-Yeob ; Lee, Chang-Heon ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 368~377
DOI : 10.3796/KSFT.2014.50.3.368
Small yellow croaker is one of the important stocks in Korean waters. In this study, we conducted sea trials to estimate optimum height of a drift gill net for effective fishing of small yellow croaker. In the trial using existing net which has 9.2m in height, there was 22 species (1,180 fishes, 99.9kg) caught. The catch (in individuals) of small yellow croaker, especially larger fishes (over 22cm in FL), was higher as part of net height is higher, while the number of species bycaught and the catch of those species were higher as part of net height is lower. In the trial using extension net which has 18.4m in height, there was 27 species (2,030 fishes, 151.7kg). It showed same pattern with existing net in the section I to III, however, in the section IV which is over 13.8m of net height, the catch sharply decreased. The number of species bycaught and the catch of those species using extension net were also same as results using existing net. It showed that section III (9.2-13.8m) where is upper-middle part of the net has caught most of catch and large fishes having over 22cm in length. Through these results, it is judged that the setting depth of the net where is 4.6-13.8m above the sea bottom is the best to reduce bycatch and catch much more large size fishes, and the catch per net is proportional to filtering area of net. Therefore the Fisheries Resource Management Act (the clause 1, article 10) on the amount of usage for offshore drift gill net need to be considered not only length of a net but also net height.
The stability of the side trawler operating in East Sea of Korea
Jo, Hyo-Jae ; Kang, Il-Kwon ; Kwon, Byong-Guk ; Ham, Sang-Jun ; Park, Chi-Wan ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 378~384
DOI : 10.3796/KSFT.2014.50.3.378
Trawlers are divided into stern and side types by the method of shooting and hauling net, but the latter is difficult to find beside Korea. In East Sea of Korea, the side type used to be in early 2000's, but it improved to stern type because of its inefficient operating method. The aims of this paper is to make clear the stability of the side trawler in the East Sea, and then confirm whether it satisfy the IMO rule or not, the degree of the transverse inclining angle of the ship when hauling net at hull side. In results, the stability of the ship in initial inclining range satisfied the IMO rule and the domestic rule, but not satisfied those rule in over the range. The limit load of the ship that was coincide with the angle of beam end in hauling net at side was about 26 tons, 18 tons in normal sea condition and storm warning condition respectively. The transverse inclining angles of the ship in hauling net were much higher from 3.3 to 5.5 times than the longitudinal inclining angle of the stern trawler, although those angles were slightly changed with depending on the loading and sea condition.
Studies on the setting a restricted area and recreation fishing management of Jeju special self-governing province
Koo, Myung-Sung ; Kim, Suk-Jong ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 385~395
DOI : 10.3796/KSFT.2014.50.3.385
This study is one of the research series for providing basic data that would contribute to the development of the field of fishing industry through the systematic fishing management, protection of fishery resources and healthy fishing culture with safety measures for fishermen in Jeju island according to the implementation of "Fishing Management and Support Act". As a result of analyzing the related acts, the contents of this study are related with provisions of "Fishing management and Support Act" on acts on fishing management, fish bait management, support for fishing and fishing related industries and with provisions of "Act of the preservation and management of desert island" on the preservation, use and development of desert island (use and development in a desert island, behavior in usable desert island). As a result of the survey, the rocks on the seashore showed the highest popularity with 52.6% for fishermen and the seawall was the highest with 47.1% for Maritime police as their fishing place in the fishing related activity data. And as the survey result about the awareness of "Fishing management and Support Act", 65.2% of general fishermen, 36.0% of maritime police and 70.5% of fishing related agencies answered that they knew the act. It was also surveyed whether they consider its contribution to fishing related industry development and positive result was shown by general fishermen and maritime police with 46.8%, 48.0% respectively whereas fishing-related enterprises showed negative answer with 47.7%. In the survey of fishing related regulation standard, general fishermen, maritime police and fishing related agencies all showed different opinions regarding the regulation standard. It is recommended that regulation standard needs to be set up after detailed review.
Catching efficiency of a shrimp beam trawl according to the length of beam and wing net and its influence on the hauling work
Park, Hae-Hoon ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 396~406
DOI : 10.3796/KSFT.2014.50.3.396
Shrimp beam trawl fishery is one of the important coastal fisheries in Korea. It has a regulation to the length of beam (8m) and wing net (7m) of shrimp beam trawl that has been used in the district of Junlanam-do and Gyungsangnam-do. This regulation was made in relation to the size of shrimp beam trawler of 3-ton class at that time. Now the shrimp beam fishing vessel has a limit not greater than 5 tons in gross ton. Recently, with improvement of fishing industry and fishing vessel fishermen asked the expansion of the length of beam and wing net, therefore it is necessary to investigate the effect of lengthening the beam and wing net length. Three different beams (8m, 10m and 12m in length) and three different wing net (7m, 10m and 13m in length) were made and the experiment was conducted near Narodo of Goheng by two fishing vessels of 4.98 and 4.88 tons in gross ton between June 2011 and October 2012. When the length of wing net was increased from 7m to 10m and 13m, the relative catch ratio in total biomass was increased 25% and 79% for shrimp, (17% and 22% in total), respectively. And when the beam length was increased from 8m to 10m and 12m, the relative catch ratio was increased 35% and 84% for shrimp, (21% and 37% in total), respectively. The force exerted to the iron guide of inhauler's with the beam length of 8m was about 30% greater than that with the beam length of 10m when hauling the shrimp beam trawl net.
Species composition and variation of catches by a set net in the coastal waters of Gyudeok, Jeju island
Kim, Maeng Jin ; Lee, Jong Hee ; Lee, Chang Heon ; Kim, Byung-Yeob ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 3, 2014, Pages 407~415
DOI : 10.3796/KSFT.2014.50.3.407
Fish was caught by a set net in Gwideok, Jeju island that was studied to determine monthly variation of species composition and catch from May 2005 to October 2006. Total catch was 54 species, 44,118 individuals, and 2,152,423.7 g during survey period. Dominant species were Trachurus japonicus and Siganus fuscescens that held 91.3% of total individuals and 71.3% of total abundance. The highest individuals and abundance of catch were in July 2005, and the lowest individuals and abundance of catch were in October 2006 and in October 2005, respectively. As the result, temporal change in abundance have corresponded with changing water temperature.