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Journal of the Korean society of Fisheries Technology
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Journal DOI :
The Korean Society of Fisheries Technology
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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
Determining the target strength bambood wrasse (Pseudolabrus japonicus) using Kirchhoff-ray mode
Kusdinar, Afriana ; Hwang, Bo-Kyu ; Shin, Hyeon-Ok ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 427~434
DOI : 10.3796/KSFT.2014.50.4.427
Although ex situ target strength (TS) measurements using dual- and split-beam systems have become the primary approach of estimating fish abundance, theoretical model estimation is a powerful tool for verifying the measurements, as well as for providing values when making direct measurements is difficult. TS values for 20 samples of live bambooleaf wrasse (Pseudolabrus japonicus) whose target length (TL) ranged between 13.7 and 21.3 cm were estimated theoretically using the Kirchhoff-ray mode model, and the TS values for 18 live fish samples were additionally measured at
tilt angle to the swimming aspect using a tethered method at a frequency of 120 kHz to verify the theoretical values. The digitizing intervals used to extract the fish body and swim bladder morphology in the X-ray photographs significantly affected the calculated TS patterns, but variations based on the speed of sound and density ratio values for the general range of fish flesh were relatively small (within 1 dB). Close agreement was observed between the measured and theoretical TS values, and the correlation between the average TS and body length of the fish could be calculated accurately as <
>= 20logTL (cm) -71.6 using the theoretical method.
Characteristics of tidal turbulence near the bottom at a coastal trench in Tongyoung, Korea
Kim, Yonghae ; Hong, Chul-Hoon ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 435~446
DOI : 10.3796/KSFT.2014.50.4.435
Tidal turbulence was examined using three-dimensional tidal velocity data observed at a trench offshore of Tongyoung, Korea. The kinetic energy and intensity, including the variation period of the flow velocity and direction, were used to investigate the relationships between tidal turbulence and fishing gear dynamics, including the effects of swimming fish during fishing operations. As the resultant velocity increased from 0.2 to 0.9 m/s, the kinetic energy also significantly increased, while the turbulence intensity decreased from 50 to 10%. Tidal flow in strong flow fields displayed shorter periods of between 4 and 10 s, as determined by fast Fourier transform, the global wavelet method, and peak event analysis, and the periods were compared with the period of response to swimming fish and to oscillation of fishing gear. As mean velocity increased, velocity amplitude also increased from 0.1 to 0.6 m/s, and its directional amplitude changed markedly from 20 and
. Our study suggests that tidal turbulence can influence fish behavior or fishing gear geometry during fishing operations, although our analysis considered only a limited area. In future work, observations should be carried out over a more extensive depth and area.
Changes in the growth and biochemical composition of Chaetoceros calcitrans cultures using light-emitting diodes
An, Heui-Chun ; Bae, Jae-Hyun ; Kwon, O-Nam ; Park, Heum-Gi ; Park, Jin-Chul ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 447~454
DOI : 10.3796/KSFT.2014.50.4.447
The marine microalgae Chaetoceros calcitrans was cultured under a fluorescent lamp (CON) and light-emitting diodes (LEDs) of various wavelengths (blue, LB; red, LR; green, LG; white, LW); changes in growth, fucoxanthin, chlorophyll-a, amino acid and fatty acid profiles were investigated. LR-exposed cultures exhibited the highest specific growth rate (SGR) (0.34), whereas LG-exposed cultures showed the lowest SGR (0.26). After cultivation for 10 days, the maximum dry cell weight (g/L) of LR-exposed cultures was significantly higher than that of those exposed to other light conditions (LR
LG). Eicosapentaenoic acid (EPA) levels were significantly higher in CON-exposed cultures compared to those exposed to LW (P<0.05), with no marked difference compared to those exposed to LB, LR and LG (P>0.05). The fucoxanthin content was highest in LB-exposed cultures (
), whereas LW showed the lowest (
; P<0.05). Chlorophyll-a content was highest in cultures exposed to LB compared to other light sources. These results suggest consistent differences in growth and biochemical composition after exposure to light of different wavelengths.
Seasonal species composition and cluster analysis of catches by shrimp beam trawl in the Geum river estuary
Lee, Sun-Kil ; Choi, Moon-Seong ; Seo, Yeong-Il ; Lee, Jae-Bong ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 455~466
DOI : 10.3796/KSFT.2014.50.4.455
Seasonal variations in species composition of catches were explored using seasonal samples caught by shrimp beam trawl in the Geum river estuary in 2011. During the study period, total catches were collected 91 species as fish 47 species, crustacean 28 species, mollusca 4 species, gastropoda 5 species, shellfish 3 species and others 4 species. The dominant species were Exopalaemon carinicauda, Eriocheir leptognathus, Palaemon gravieri, Mugil cephalus, Acanthogobius hasta, Cynoglossus joyneri, Pennahia argentata and Coilia nasus. The amount of species in spring and summer was higher than in autumn. The diversity index (H') was 0.43~0.96, evenness index (EI) was 0.14~0.25, and richness index (RI) was 1.54~4.25. Using cluster analysis 91 species were divided into 4 groups. Group I appeared mainly in spring and summer. Group II appeared only in summer. Group III appeared in winter and spring, and Group IV in spring and autumn.
Management of small yellow croaker stock in Korean waters based on production value-per-recruit analysis
Zhang, Chang-Ik ; Lee, Eun-Ji ; Kang, Hee-Joong ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 467~475
DOI : 10.3796/KSFT.2014.50.4.467
This study was performed to estimate optimum fishing mortality (F) and the age at first capture (
) for small yellow croaker in Korean waters. We first estimated optimum F and
using traditional yield-per-recruit (YPR) analysis, and the results were 0.8/year and 2.5 years old, respectively. However, the individual fish price per unit weight of small yellow croaker in Korea increases dramatically by size. Thus, we developed an alternative method, which is called as production value-per-recruit (PPR) analysis. We developed two types of the PPR analysis, that is, the discrete function and the continuous function method. We estimated optimum F and
using the two types of the PPR analysis and compared the results. The optimum F and
from the discrete function method, were 0.3/year and 5.0 years old, respectively, while those from the continuous function method were 0.5/year and 3.5 years old, respectively. These PPR estimates were much more conservative for the stock management than the traditional YPR analysis, which can prevent the fish stock from the economic overfishing. As a result, the PPR analysis could be more proper approach for stock assessment in the case that the individual fish price per unit weight increases dramatically by size like small yellow croaker in Korea.
Backscattering strength and vertical distribution of dominant fishes in inland waters by hydroacoustics
Yang, Yong-Su ; Lee, Kyounghoon ; Hwang, Bo-Kyu ; Lee, Hyungbeen ; Kim, In-Ok ; Kim, Seonghun ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 476~486
DOI : 10.3796/KSFT.2014.50.4.476
This study is aimed to understand the vertical distribution of fish in the daytime and nighttime using an acoustic survey in Yondam reservoir of Jeollabuk-do, and an acoustical backscattering strength of dominant species, bass (Micropterus salmoides) and a bluegill (Lepomis macrochirus), which are classified as the ecosystem disturbing species. The results showed that the fish school was distributed in the shallow areas of less than 10 m depth during the period of Aug. and Oct. where it had a strong thermocline, otherwise, it was distributed over 10-times density under stable water temperatures as
in Nov. There was no vertical patchiness difference between daytime and nighttime unlike the typical marine ecosystem. The dominant species were crucian carp, bluegill, bass. The hydroacoustic method can provide the spatial distribution and effective removal ways of the ecosystem disturbing species in inland fisheries.
Power supply performance photovoltaic (PV) system for 3-ton class fishing vessel
Jeong, Seong-Jae ; Lee, Dong-Gil ; Park, Seong-Wook ; Kim, Hee-Jin ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 487~494
DOI : 10.3796/KSFT.2014.50.4.487
This study describes the result on PV system for evaluating the performance of small fishing boats. Photovoltaic system with 200 watts power generation facilities on the 3-ton fishing boat was carried. Load test was performed on the condition that the work lamps lit during night operations. As a result the performance can be used for more than two hours at 60 watt work lamps. The load test was performed on the condition that fishing vessels are on the cruising condition at sea. The solar power systems have been investigated as a power generation efficiency of about 36.55%. Additional tests show that the power generation efficiency is difficult to expect a maximum of 50% or more. Fuel consumption of fishing boats by installing a solar power system is reduced. Also the PV system is useful for the verification of their availability for fishing vessels as well as the satisfaction of the fishermen. The results for the durability of the photovoltaic device is acceptable, including a solar panel, controller and the performance exhibited no breakage in the harsh marine environment or failure so far. The installed PV system was confirmed that the durability with at least 2 years.
Analysis of basic productivity of fishing vessels registered on Aewol port in the Jeju island
Lee, Chang-Heon ; Ahn, Jang-Young ; Choi, Chan-Moon ; Kim, Byeong-Yeob ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 495~501
DOI : 10.3796/KSFT.2014.50.4.495
In order to propose basic references for the policy making of fishing vessel fishery by Jeju Special Self-Governing Province, we have obtained the basic productivity through analyzing operating days and catches of 16 sample fishing vessels registered in Aewol port, the north of Jeju island in the year of 2011. In addition, to compare with the basic productivity of southern sea area in the Jeju island, that of 7 sample fishing vessels registered in Kangjung port was used. Around Aewol port, average operating days during the main catch period from July to October were over 15 days a month. A average daily catch of fishing vessels was minimum 21.0 kg in May and reached to maximum 54.5 kg in December, showing U-shaped catch pattern through the year. The trend formula of the average daily productivity (y) depending on a tonnage (x) of fishing vessels around Aewol port was described by the equation, y = 18.867 ln(x) + 11.001, and that around Kangjung port in the year of 2009 was understood to be y = 23.271 ln(x) + 25.715. As a result, it seemed that the productivity of fishing vessels around Kangjung port, operating in the southern sea area of Jeju Island, was much greater than that of fishing vessels around Aewol port in the northern sea area of Jeju Island. Especially, that of fishing vessels less than 10 tons was 35-40% more.
An analysis on the relationship between prices and catch amounts of sandfish using a cointegration test
Seo, Young-Il ; Chung, Young-Hoon ; Kim, Do-Hoon ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 502~510
DOI : 10.3796/KSFT.2014.50.4.502
This study aimed to analyze the relationship between catch amount and market price of sandfish for improvement of fishing revenues and effective fisheries management. By estimating the sandfish price function by fishery, the study tried to investigate changes of prices by catch amount as well as changes of fishing revenues by catch amount and price. Results showed that time series data on catch and price were estimated to be non-stationary from unit root tests, but long-term equilibrium relations between catch amount and price were found from a cointegration analysis. Results of regression analyses indicated that the catch amount would have negative impacts on prices of sandfish in both coastal gillnet and danish seine fisheries.
Simulation of undewater irradiance distribution in coastal squid jigging vessel using the LED and metal halide fishing lamp combination
Bae, Jae-Hyun ; An, Heui-Chun ; Kim, Mi-Kyung ; Park, Hae-Hun ; Jung, Mee-Suk ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 511~519
DOI : 10.3796/KSFT.2014.50.4.511
This study is aimed to analyze the three-dimensional underwater irradiance using an optical simulation software and to clarify the propriety and operation method under considering luminous intensity distribution of the luring lamp and penetrability in the seawater, when we use the light diffuser type 300W high powered LED and the metal halide lamp (MHL) on a coastal squid jigging vessel in the 10-ton class, simultaneously. For their attenuation characteristics of each wavelength in relation to the sea, LED lamp was to be effective in the 1.9-fold at 50 m depth and 2.1-fold at 80 m for underwater irradiance more than MHL according to the power consumption. In addition, the underwater irradiance distribution using the LED and MHL combination was rather increased even when reducing total power usage up to 20% depending on the simulation with changing the configuration and lighting angle of the lamp. These results can be utilized as an evaluation method of the operation and performance of the LED lamp according to adjusting its arrangement and lighting angle.
Bycatch and discards of the whelk trap in the Uljin waters, East Sea
An, Heui-Chun ; Bae, Jae-Hyun ; Park, Jong-Myung ; Hong, Sung-Eic ; Kim, Seong-Hun ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 520~529
DOI : 10.3796/KSFT.2014.50.4.520
Experiment was set up to analyze bycatch and discards situation including snow crap Chionoecetes opilio of whelk trap. Four types of trap were used: drum type trap with PE net; drum type trap with PBS net; cylinder type trap with PE net; and cylinder type net with PBS net. Three funnels were attached in drum type trap and two funnels were used in cylinder type trap. A fleet of traps was consisted with one hundred traps. 25 traps of each type were set on a line in repeated sequence. Field experiments were conducted with 6 fishing operations in the Uljin waters, East Sea in July 2014. Catch of target whelks were 173,261 g and catch rate was 48.7% of total catch, while bycatch were 182,571 g, 51.3% of tatal catch. The catch rate of bycatch was 2.6% higher than that of target catch. Bycatch weight of snow crap was the highest as 142,987 g and formed about 40.2% of total catch, followed giant octopus, Enteroctopus dofleini, 31,762 g (8.9%). Bycatch rate of cylinder type trap was 2.3 times higher than that of drum type trap. Discard rate (discard/(discard+landing)) was 43.6%. Discard rate was the highest at cylinder type trap with PBS net as 63.1%, followed cylinder type trap with PE net as 47.9%, drum type trap with PE net as 33.4%, the lowest at drum type trap with PBS net as 22.1%.
Species composition and cluster analysis of the communities caught by dredge in relation to tooth spacing and mesh size in the coastal waters of Gangneung, Korea
An, Heui-Chun ; Bae, Jae-Hyun ; Park, Jong-Myung ; Park, Chang-Doo ; Hong, Sung-Eic ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 530~541
DOI : 10.3796/KSFT.2014.50.4.530
The dredge gear is dragged along the bottom of the sea to catch targeted edible bottom dwelling species. Species composition and ecological index of the catches of dredge were estimated around Gangneung coastal fishing ground by dredge with different mesh size and tooth space from July to December 2013. Eight different types of dredge including four different tooth space (24.7 mm, 29.9 mm, 34.9 mm, 40.1 mm) and four different mesh size(15.5 mm, 32.7 mm, 51.1 mm, 60.0 mm) were used in the experiment. During the experiment, total catches were collected 31 species as sipunculida 1 species, mollusca 13 species, annelida 3 species, arthropoda 8 species, echinodermata 4 species and others 2 species. The dominant genus were mollusca and echinodermata while the dominant species were Megangulus venulosus, Pseudocardium sachalinensis, Schaphechinus brevis. The richness index was ranged 1.29-1.72, evenness index was 0.6-0.65 and diversity index was 1.65-1.83 according to the tooth space and mesh size of dredge. Richness index, diversity index were high at tooth space 34.9 mm dredge and ecological index showed decreasing tendency with the increasing of mesh size of dredge. Cluster and MDS analysis, based on a Bray-Curtis and similarity matrix of fourth root transformed data of number of species and wet weight, showed division into four different groups as four different tooth space (Group A), four different mesh size Group B (51.1 mm, 60.0 mm), Group C (32.7 mm) and Group D (15.5 mm).
Adaptation of light emitting diode (LED) at culture on attachment plate of diatom
Bae, Jae-Hyun ; An, Heui-Chun ; Kim, Mi-Gyeong ; Park, Jin-Chul ; Park, Heum-Gi ; Kwon, O-Nam ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 542~550
DOI : 10.3796/KSFT.2014.50.4.542
We investigated biomass, diatom species and fucoxanthin contents as cell growth, fatty acid and amino acid contents as nutritional composition of diatoms attached on plate to confirm effects of light emitting diodes (LEDs) due to block off natural light. In the single LED irradiation, biomass showed significantly higher to
in white LED than that of others (P<0.05). The dominate diatom species was Navicula cancellata. Their lipid contents showed significantly higher to
dry matter (DM) in control than that of others LEDs. But eicosapetaenoic acid (EPA) contents showed significantly higher to
DM than others, but not significantly differed with natural control light treatment (P<0.05). And total protein contents are higher in control and blue LED light than that of others, but essential amino acid contents showed significantly higher to
in control (P<0.05). In mixing light with natural and LED light, biomass showed
in blue LED (P<0.05). Fatty acids contents were not significantly differed with all treatments. Amino acid contents showed to
DM in white LED (P<0.05), but not significantly differed with others LED lights (P>0.05). Therefore, we could suggest that irradiation of blue LED in natural light very benefit to diatom culture for larvae of sea cucumber and abalone and do on.
Verification of mean volume backscattering strength from acoustic doppler current profiler by using calibrated sphere method
Yang, Yong-Su ; Lee, Kyounghoon ; Lee, Dae-Jae ; Lee, Dong-Gil ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 551~555
DOI : 10.3796/KSFT.2014.50.4.551
ADCPs have been widely used to estimate the dynamic characteristics and biomass of sound scattering layers (SSLs), and swimming speed of fish schools for analyzing SSLs spatial distribution and/or various behavior patterns. This result showed that the verification of the mean volume backscattering strength (MVBS or averaged SV, dB) acquired by the ADCP would be necessary for a quantitative analysis on the spatial distribution and the biomass estimation of the SSLs or fish school when ADCP is used for estimating their biomass. In addition, the calibrated sphere method was used to verify values of each MVBS obtained from 4 beams of ADCP (153.6 kHz) on the base of 3 frequencies (38, 120, 200 kHz) of Scientific echo sounder's split beam system. Then, the measured SV values were compared and analyzed in its Target Strength (TS, dB) values estimated by a theoretical acoustic scattering model.
Catch characteristics of the Korean tuna longline fishery in the Atlantic ocean
Pakr, Hee-Won ; Yoon, Sang-Chul ; Kim, Zang-Geun ; Lee, Sung-Il ; Jeong, Yeon-Kyu ; Lee, Dong-Woo ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 556~566
DOI : 10.3796/KSFT.2014.50.4.556
Korean distant water tuna longline fishery commenced in 1966 in the Atlantic Ocean. Since then, it has become one of the most important fisheries of Korea. By early of 1970s, total amount of tuna caught in the Atlantic Ocean was the highest among other Korean distant water tuna fisheries, but has become minor since 1990s. The annual catch of tuna and tuna-like species by Korean tuna longline fishery in the Atlantic Ocean was about 1,900 mt in 2013. Bigeye tuna was the predominant species in species composition followed by yellowfin tuna, Albacore tuna, Blue shark and Swordfish. Korean distant water tuna longline fishery have mainly operated in the tropical area of the Atlantic Ocean (
), fishing ground was almost similar as in the previous years. The length frequency of major species (Bigeye tuna, Yellowfin tuna, Albacore tuna, Blue shark and Swordfish) were estimated. As the result of length (size) frequency data on main species caught by lonline fishery in the Atlantic Ocean, main length intervals of bigeye tuna caught in 2011, 2012 and 2013 were 120~125 cm, 160~165 cm and 130~135 cm, respectively. For yellowfin tuna, those were 125~130 cm, 150~155 cm, 145~150 cm and for albacore, 109 cm, 102 cm, 109 cm and 106 cm respectively. For swordfish caught in 2011, 2012 and 2013, main length intervals were 130~135 cm, 125~135 cm and 125~130 cm, respectively, and for blue shark, 195~200 cm in 2011 and 185~190 cm in 2012, 2013.
Ecosystem-based resource assessment on coastal fisheries of Uljin in East Sea of Korea
Yoon, Sang-Chul ; Zhang, Chang-Ik ; Seo, Young-Il ; Kim, Zang-Geun ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 567~582
DOI : 10.3796/KSFT.2014.50.4.567
Coastal fisheries in Korean waters have highly complexity with a variety of fishing gears, and scale of those fisheries is smaller than that of offshore fisheries. As a result, important spawning and nursery grounds for many species of fish has been destroyed. The pragmatic ecosystem-based approach was developed for the assessment of fisheries resources in Korean waters by Zhang et al. (2009; 2010). As for the species risk index (SRI), common squid caught by coastal gillnet in the Uljin region had the highest risk. As for the fisheries risk index (FRI), coastal gillnet in the Uljin coastal waters had the highest risk. For the common squid which had the highest SRI, resources management strategies must be established such as catch prohibition of length and period with TAC. For the coastal gillnet in the Uljin region which had the highest FRI, it is judged to need management plans for conserving biodiversity as reducing the catch of non-target species and discards. Also to protect existing habitat, illegal fishery should be prohibited, and fishing gears should be designed in the environmental-friendly way considering when fishing gears lost.
Stock assessment of starry flounder, Platichthys stellatus and olive flounder, Paralichthys olivaceus in the Uljin marine ranching area, Korea
Yoon, Sang-Chul ; Lee, Sung-Il ; Yang, Jae-Hyeong ; Yoon, Byoung-Sun ; Kim, Jong-Bin ; Cha, Hyung-Kee ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 583~594
DOI : 10.3796/KSFT.2014.50.4.583
This study was performed to estimate biomass and provide management guidance through population ecological characteristics, including growth parameters, instantaneous coefficients of natural and fishing mortalities, and age at first capture of the starry flounder, Platichthys stellatus and olive flounder, Paralichthys olivaceus of Korea. For describing growth of this species, a von Bertalanffy growth model was adopted. The von Bertalanffy growth parameters estimated from a non-linear regression for starry flounder were
, K=0.16/yr, and
, respectively and those for olive flounder were
, K=0.26/yr, and
, respectively. Biomass of Platichthys stellatus was estimated by direct biomass estimation method was 2.6 M/T, that was estimated by indirect method was 13.4 M/Tt. Those of Paralichthys olivaceus were estimated as 10.1 M/T, 19.3 M/T, respectively. An yield per recruit analysis showed that the current yield per recruit on Platichthys stellatus was about 48.2 g with F=0.646/yr and the age at first capture (
) 1.35yr, that on Paralichthys olivaceus was about 167.6 g with F=1.121/yr and the age at first capture (
Measurement of turbulence intensity of cage net using the particle imaging velocimetry
Bae, Jae-Hyun ; An, Heui-Chun ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 595~603
DOI : 10.3796/KSFT.2014.50.4.595
This study is aimed to analyze the hydrodynamic characteristics of the cage net in the circulating water channel. It visualized wake flows using a PIV (paricle imaging velocimetry) and analyzed the flow velocity distribution. In addition, the vorticity and turbulence intensity were analyzed from the wake flow distribution and compared changes by flow velocity. Results showed that the average turbulence intensity in the circulating water channel was very stable showing less than 1% in the range between 0.2 and 0.8 m/s. The drag coefficient affecting to the netting was estimated to be 1.35. The flow decreasing rate of the wake in the middle of the netting was 2.1% at the range of 0.2 m/s and it was constant at 6.6-6.9% over the range of 0.4 m/s irrespective of velocity increases. Finally, the change of turbulence intensity by netting and knot mesh could be confirmed. These results can be utilized as a basic information for the future research of flow characteristics by fishing nets and meshes.
Species composition and community structure of benthic crustacean assemblage around Oryukdo in southeastern waters off Korea
Heo, Yu-Sim ; Choi, Jung-Hwa ; Kim, Jung-Yun ; Lee, Dong-Woo ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 604~613
DOI : 10.3796/KSFT.2014.50.4.604
Community structures and species composition in benthic crustacean around Oryukdo of Busan was investigated using a SCUBA diving in 2011. A total 115 species, 51 families, and 4 taxa were collected during the sampling periods. Species were included 52 species in amphipoda, 49 in decapoda, 8 in isopoda and 6 in thoracica. On cluster analysis, the benthic crustacea community was classified into three groups based on the species composition: group A occurred in spring, group B in autumn and winter and group C in summer. Species composition in benthic crustacean corresponded with the water temperature.
A basic research on risk control measure for reducing the fishermen's occupational accident in offshore and coastal fishing vessel
Kim, Wook-Sung ; Cho, Young-Bok ; Kim, Seok-Jae ; Ryu, Kyong-Jin ; Lee, Yoo-Won ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 614~622
DOI : 10.3796/KSFT.2014.50.4.614
The aim of this study is to research attributes of fishermen's occupational accidents for investigating the measure of risk control on situational condition in the Korean offshore and coastal fishing vessel. Using data of fishermen's occupational accidents are from National federation of fisheries cooperatives for 2013. The results were as belows; Occupational accident occurrence rate was 29.5‰, slips & trips and struck by object and contact with gear were shown severe occurrence pattern. Occupational accident occurrence rate of offshore fisheries was 130.2‰, coastal was 16.9‰, specially the risk rates were severely high in several type of danish seine, stow net and offshore trap. Death rate by accidents was 10.6‰ and by fall into the water in occurrence pattern was 5.5‰.
Stability of fishing vessel according to the LED luring lamp installation
Jeong, Seong-Jae ; An, Heui-Chun ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 623~632
DOI : 10.3796/KSFT.2014.50.4.623
In this study, the stability of fishing vessels get some change in accordance with the installation of LED luring lamp in comparison with metal halide luring lamp were investigated. Inclining test for 9.77 ton class of squid jigging and hair-tail angling vessel was performed in order to make a stability evaluation. A performance analysis of the target vessels to the stability on the basis of KST-SHIP program was evaluated. The results were as follows in this study. The stability of the fishing vessel by a metal halide such as LED and the like according to the result obtained by the inclining test is a slightly present difference, and the stability is not affected. The fishing vessel with LED lamp installed satisfies all the stability criteria specified in law and IMO rule. Compared to the metal halide LED lamp the increase of the height of the center of gravity and the initial transverse metacenter was caused. Due to the LED installation, the somewhat wider wind area of the waterline, which appears as a result, does not lead to an actual increase in rolling period. But then it is necessary to be designed on that the LED lamp shape reduces wind pressure area. Because of LED lamp installation, the GM value of vessels is increasing faster rolling cycle so causes a decrease in the sense that the crew is aboard.
Fluctuations in abundance and species composition of fishes collected by gill net fisheries in coastal water of Yeosu, Korea
Oh, Seong-Jae ; Han, Kyeong-Ho ; Koh, Su-Jin ; Lee, Seong-Hun ; Shin, Lim-Soo ;
Journal of the Korean society of Fisheries Technology , volume 50, issue 4, 2014, Pages 633~642
DOI : 10.3796/KSFT.2014.50.4.633
Monthly variation in abundance and species composition of the fishes were investigated based on specimens collected by gill net in coastal water of Yeosu from October, 2009 and February, May, August, 2010. The collected fishes were 1,529 individuals (183,840g) of the total, identified into 6 orders, 16 families and 24 species. The most dominant order fish was Perciformes comprised 9 species, 7 families, and followed Pleuronectiformes comprised 5 species, 3 families, Scorpaeniformes comprised 5 species, 2 families. These 3 orders constituted 81.1% of the total collected fish. During the study, most dominant species was Hexagrammos otakii accounted for 189 individuals (12.4%) of the total, followed by Lateolabrax japonicus 165 individuals (10.8%), Hexagrammos agrammus 154 individuals (10.0%). The fish was collected by a gill net in coastal water of Yeosu from October, 2009 and February, May, August, 2010, the diversity index of the fishes was 2.09~2.66, which was the highest in August, 2010 and the lowest in February, 2010. The evenness index of them was 0.84~0.89, which was the highest in August, 2010 and the lowest in February, 2010 and the richness index of them was 2.02~3.14, which was the highest in October, 2009 and the lowest in February, 2010. The analyzed species diversity index by the each stations was 2.47~2.66 and the evenness index was 0.84~0.90 and the richness index 2.99~3.37. The similarity of community structure per season was very high which was the least in spring and fall. In addition, the community structure was very similar in state 3 and 2 out of each stations.