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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 45, Issue 4 - Nov 2009
Volume 45, Issue 3 - Aug 2009
Volume 45, Issue 2 - May 2009
Volume 45, Issue 1 - Mar 2009
Selecting the target year
Hooking rate and bait loss rate of traditional hairtail hand line according to immersion time in the coastal waters of Jeju
Kim, Byung-Yeob ; Park, Young-Seok ; Lee, Chang-Heon ;
Journal of the Korean society of Fisheries Technology , volume 45, issue 2, 2009, Pages 77~84
DOI : 10.3796/KSFT.2009.45.2.077
This paper is to investigate the effect of the immersion time in the traditional hairtail hand line for developing the fishing methods and the fishing gear in the coast of jeju. The operating of 32 times was made with each different immersion time of hairtail hand line, and the relations between the catch and the immersion time were examined. As the result, targeted species rate was over 98% of total catch. From about 800 seconds after casting, the hooking rate was decreased and the bite loss rate was increased, it seems to be made by the decreasing factors of predators including the cutting of branch lines etc. In addition, it was supposed that the hooking rate and the bait loss rate had a deep connection with feeding time zone. The level of the correlation coefficient of the bait loss rate according to the immersion time was 0.54 at
, in the case of the hooking rate, 0.59 was chosen after about 800 seconds. The hooking rate and the bait loss rate according to the hook number were not irrelevant to the fish school layer. Additionally, it was assumed that the bait loss rate was related to the depth of water.
Design and performance evaluation of fish-luring system using the air-cooled LED lamp for jigging and angling boat
Bae, Bong-Seong ; Park, Byoung-Jae ; Jeong, Eui-Cheol ; Yang, Yong-Su ; Park, Hae-Hoon ; Chun, Young-Yull ; Chang, Dae-Soo ;
Journal of the Korean society of Fisheries Technology , volume 45, issue 2, 2009, Pages 85~95
DOI : 10.3796/KSFT.2009.45.2.085
The fishing lamp is a fishing gear that gathers fish at night. But the cost of oil, which is used to light fishing lamp, has been risen significantly up to 30-40% of total fishing costs. Therefore it is very urgent to develop an energy economical fishing lamp in order to solve the business difficulties of fisheries. Under this background, this research aims at developing a fishing lamp for squid jigging and hairtail angling fishery using the LED, which has excellent energy efficiency and durability. The LED fishing lamp developed can be controlled to fix a fit direction of fish shoal deep because a fishing lamp can be adjustable up and down directions. One unit of fishing lamp has about an 80Watt capacity and the frame of fishing lamp is made of aluminium to emit generated heat of LED to outside. The LED lamp developed was highly durable, only 5.7% of emitting efficiency decreased for 18 months. The illuminance of a unit LED lamp was 2,070lux at 1m and 21lux at 10 m distance, and the intensity of LED lamp system emitted 2,580lux and 400lux at the respective distances. After development of this fishing lamp, 100 units are installed on operating fishing vessels. Experimental results show that energy consumption of squid jigging and hairtail angling was reduced by 40% and 87%, respectively. In conclusion, our methods showed elevated fishing power, compared with traditional fishing method: 37.7% for squid jigging and 24.5% for hairtail angling.
An analysis on catch and fishing power of trammel nets by fishing ground
Bae, Bong-Seong ; Park, Hae-Hoon ; Jeong, Eui-Cheol ; An, Heui-Chun ; Yang, Yong-Su ; Chun, Young-Yull ;
Journal of the Korean society of Fisheries Technology , volume 45, issue 2, 2009, Pages 96~105
DOI : 10.3796/KSFT.2009.45.2.096
For an effective management of fisheries resources, we need fisheries informations necessary for the establishment of reasonable fishing effort and TAC distribution. We carried out fishing research using trammel nets in the coastal sea of Susan-port(Yangyang, Gangwondo, Korea) and Hupo-port(Uljin, Gyeongbukdo, Korea) and analyzed fishing power variation of the fishing gear in terms of species composition, condition and so on for both sites. A total of 29 species were caught with most dominant species of Hippoglossoides dubius followed by Pseudopleuronectes herzensteini, Lophius litulon and Alcichthys elongatus in Susan. The total number of species caught in Hupo was 37 species with most dominant species of Todarodes pacifius followed by Lophius litulon, Hexagrammos agrammus and Pseudopleuronectes herzensteini. CPUE of Susan fishing area per trammel net was 12.74 fish and 2.00kg on average, while it was 6.80 fish and 2.27kg on average for Hupo. The fishing power index for both sites was 1, placing the two fishing grounds in a same level.
Collision risk considering the international regulations for preventing collisions at sea, 1972
Kang, Il-Kwon ; Kim, Hyung-Seok ; Kim, Min-Seok ; Kim, Jeong-Chang ; Lee, A-Reum ;
Journal of the Korean society of Fisheries Technology , volume 45, issue 2, 2009, Pages 106~113
DOI : 10.3796/KSFT.2009.45.2.106
For the safety and cost reduction in the navigation, the automatic and intelligent system has been developed for the vessel, and the most important factor in the system is to decide the collision risk exactly. In this paper, we propose an advanced collision risk decision system for collision avoidance of the system. The conventional researches using DCPA and TCPA for calculating the collision risk have a problem to produce a same collision risk regardless of bearings for the ships, if they are located in the same distance from own ship. To solve this problem, in addition to DCPA and TCPA, we introduce the factor of VCD(variation of compass degree) and constant, CR which derived from COLREG'72(International Regulation for Preventing Collision at Sea, 1972) for evaluating the collision risk including even the burden of own ship navigator due to the encountering angle of each vessels. We decided the collision risk legally by the rule considering the relative situation of vessels. And therefore, the proposed system has two advantages, of which one is to produce more detail collision risk and another is to reflect the real underway situation in conformity with the rule.
Combustion characteristics of diesel engine with bio-ethanol blend fuel
Jung, Suk-Ho ;
Journal of the Korean society of Fisheries Technology , volume 45, issue 2, 2009, Pages 114~121
DOI : 10.3796/KSFT.2009.45.2.114
There are increased in using the bio-ethanol, as the carbon neutral attracts many researchers due to a reduction in carbon dioxide spotted as the global warming gas. A gasoline engine with 100% of the bioethanol was developed and used in Brazil already, but researches of using the bio-ethanol in diesel engines are lack. In this study, combustion tests with blend fuel of the gas oil and bio ethanol by 50% maximally due to a low cetane number of bio-ethanol were accomplished as a basic study of introduction of using the bioethanol in diesel engines. The result was that smoke emission was decreased with increase in proportion of the bio-ethanol, due to the increase of a amount of pre-mixed combustion with ignition delay. Although the amount of
is reduced according as the bio-ethanol is used(carbon neutral), the emission of
with increase in the proportion of the bio-ethanol was more increased due to lower a heat value of bio-ethanol than gas oil.
Size selectivity of gill net for female snow crab, Chionoecetes opilio
Park, Chang-Doo ; An, Heui-Chun ; Cho, Sam-Kwang ; Bae, Bong-Seong ; Park, Hae-Hoon ; Bae, Jae-Hyun ; Kim, Hyun-Young ;
Journal of the Korean society of Fisheries Technology , volume 45, issue 2, 2009, Pages 122~127
DOI : 10.3796/KSFT.2009.45.2.122
A series of fishing experiments was carried out in the eastern coastal waters of Korea from January, 2002 to March, 2003, using gill nets of different mesh sizes (m 180, 210, 240, 270 and 300 mm) to determine the size selectivity of gill net for female snow crab, Chionoecetes opilio. The catch of experimental gears was mostly snow crab (97%), Chionoecetes opilio. The maximum carapace length (RL) of each female snow crab caught in the fishing experiments was measured. The master selection curve was estimated by applying the extended Kitahara s method. The selection curve showed that the gill nets of larger mesh size allowed more female crabs of small carapace size to escape. The optimum values of RL/m for 1.0 of retention probability was 0.563 and RL/m was estimated to be 0.249, 0.290, 0.319, 0.344 and 0.367 when the retention probability were 0.1, 0.2, 0.3, 0.4 and 0.5, respectively.