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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Fisheries and Aquatic Sciences
Journal Basic Information
Journal DOI :
The Korean Society of Fisheries and Aquatic Science
Editor in Chief :
Volume & Issues
Volume 44, Issue 6 - Dec 2011
Volume 44, Issue 5 - Oct 2011
Volume 44, Issue 4 - Aug 2011
Volume 44, Issue 3 - Jun 2011
Volume 44, Issue 2 - Apr 2011
Volume 44, Issue 1 - Feb 2011
Selecting the target year
Isolation of a Nonylphenol-degrading Microbial Consortium
Song, Won ; Lim, Keun-Sick ; Yu, Dae-Ung ; Park, Mi-Eun ; Jeong, Eun-Tak ; Kim, Dong-Myung ; Chung, Yong-Hyun ; Kim, Young-Mog ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 325~331
DOI : 10.5657/KFAS.2011.0325
Nonylphenol (NP), which is well known as an endocrine disrupter, has been detected widely in untreated sewage or waste water streams. Given the necessity of discovering an eco-friendly method of degrading this toxic organic compound, this study was conducted to isolate NP-degrading microorganisms from the aqueous environment. NP-degrading microbes were isolated through NP-containing enrichment culture. Finally, a microbial consortium, SW-3, capable of degrading NP with high efficiency, was selected from the mixture sample. The microbial consortium SW-3 was able to degrade over 99% of 100 ppm NP in the culture medium for 40 days at
. The microbial consortium SW-3 seemed to utilize NP as a carbon source, since NP was the sole carbon source in the culture medium. In order to isolate the NP-degrading bacterium, we further conducted single colony isolation using the microbial consortium SW-3. Four strains isolated from SW-3 exhibited lower NP-degradation efficiency than that of SW-3, suggesting that NP was degraded by the co-metabolism of the microbial consortium. We suggest that the microbial consortium obtained in this study would be useful in developing an eco-friendly bioremediation technology for NP degradation.
Effect of Dietary Supplementation with Alga (Hizikia fusiformis and Ecklonia cava) on the Non-specific Immune Responses of Parrot Fish Oplegnathus fasciatus
Song, Jin-Woo ; Jang, Ji-Woong ; Kim, Sung-Sam ; Oh, Dae-Han ; Cha, Ji-Hoon ; Lee, Kyeong-Jun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 332~338
DOI : 10.5657/KFAS.2011.0332
Two feeding trials were conducted to determine the effects of dietary supplementation with Hizikia fusiformis or Ecklonia cava on the non-specific immune responses of parrot fish Oplegnathus fasciatus. Fish were fed experimental diets to which H. fusiformis or E. cava powder were added to final concentrations of 0, 2, 4 and 6%, respectively. After feeding for two weeks, phagocytic activity was significantly higher in fish fed diets containing H. fusiformis, but not E. cava, than in fish fed the basal diet. Lysozyme activity was significantly increased in the fish fed diets containing 6% H. fusiformis and E. cava. Myeloperoxidase activity was also significantly higher in fish fed diets containing 2 and 4% H. fusiformis, as compared to the basal diet, but not in those fish fed E. cava. These two studies indicate that dietary supplementation with H. fusiformis or E. cava could enhance the innate immune responses of parrot fish during their growth stage.
Effect on Enrichment with Schizochytrium sp. and Squid Todarodes pacificus Liver Oil on Fatty Acid Content of Live Feed
Park, Jin-Chul ; Lee, Bae-Ik ; Kwon, O-Nam ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 339~344
DOI : 10.5657/KFAS.2011.0339
We investigated the effects of enrichment with oil or bacteria on the fatty acid composition of rotifers and Artemia as live prey. One enrichment(oil source) was mainly composed of squid Todarodes pacificus liver oil; the other(photosynthetic-bacterial source) was primarily made up of Schizochytrium sp. The enrichments were intended to enhance the nutritional value of the live prey, such as their EPA, DHA and n-3 HUFA contents. The lipid content as EPA and DHA of rotifers was higher when enriched with the oil source rather than the photosynthetic-bacterial source. The DHA content of Artemia nauplii after enrichment differed significantly, depending on the type of enrichment used(P<0.05). When the Artemia nauplii were enriched with the oil source, the DHA content was increased to 16.8%, whereas it increased only to 1.1% when enriched with the photosynthetic-bacterial source. These results indicate that selection of the enrichment is important for Artemia nauplii but not for rotifers.
Optimum Feeding Rates in Juvenile Olive Flounder Paralichthys olivaceus Fed Practical Expanded Pellet at Low and High Water Temperatures
Kim, Kang-Woong ; Hwang, Nam-Yong ; Son, Maeng-Hyun ; Kim, Kyoung-Duck ; Lee, Jun-Ho ; Yi, Liu ; Yun, Yong-Hyun ; Park, Gun-Hyun ; Kim, Sung-Sam ; Lee, Kyung-Jun ; Bai, Sung-Chul C. ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 345~351
DOI : 10.5657/KFAS.2011.0345
Two feeding trials were conducted to investigate the optimum feeding rates in juvenile olive founder Paralichthys olivaceus fed practical expanded pellet(EP) containing 58.1% crude protein, 10.7% crude lipid, and 10.8% ash at low and high water temperatures. In the first experiment, triplicate groups of 15 fish with average weight of 7.7 g were fed at one of seven feeding rates(0, 1, 1.5, 2, 2.25, or 2.5% of body weight/day or to satiation) for 4 weeks at low water temperature. In the second experiment, quadruplicate groups of 20 fish with average weight of 5.5 g were fed at one of eight feeding rates(0, 3, 3.5, 4, 4.25, 4.5, or 4.75% of body weight/day or to satiation) for 4 weeks at high water temperature. Based on growth performance, we estimated that the optimum feeding rates for juvenile olive flounder were 1.97-2.51% and 4.82-6.36% of body weight/day at low and high water temperatures, respectively.
Characterization of the Repetitive Sequences Present in the ORF25 Genomic Region of Megalocytiviruses from Ornamental Fishes
Jin, Ji-Woong ; Nam, Jeong-Hee ; Kim, Kwang-Il ; Hong, Su-Hee ; Byon, Ju-Young ; Jeong, Hyun-Do ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 352~358
DOI : 10.5657/KFAS.2011.0352
The presence of ISKNV-like viruses in various freshwater ornamental fish species imported from Asia was confirmed by polymerase chain reaction(PCR) amplification of the ATPase(adenosine triphosphatase) gene. Interestingly, molecular analyses of the Open Reading Frame 25(ORF25) region of these isolates based on the ISKNV(Infectious spleen and kidney necrosis virus) genome revealed the presence of various repetitive sequences. ORF25 repeat sequence length had no effect on cumulative mortality of rock bream Oplegnathus fasciatus challenged with tissue homogenates of infected pearl gourami, Trichogaster leeri; silver gourami, Trichogaster microlepis; blue gourami, or Trichogaster trichopterus. All isolates induce cumulative mortalities after 12 days of infection, confirming that ORF25 polymorphism did not affect the pathogenicity of ornamental fish megalocytiviruses that cross infect rock bream, a seawater fish. Also, no statistically significant differences in spleen index or viral copy number in infected tissues was detected between isolates with varying ORF25 repeat sequence lengths. However, further studies are necessary to fully characterize the functional characteristics of these polymorphisms in megalocytivirus disease in ornamental fishes.
State of Aquaculture Management for Optimal Rearing of Eel Anguilla japonica
Son, Maeng-Hyun ; Kim, Kang-Woong ; Kim, Kyoung-Duck ; Kim, Shin-Kwon ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 359~365
DOI : 10.5657/KFAS.2011.0359
This study was conducted to investigate the production, elver stocking, rearing facilities and rearing method of eel culture to determine aquaculture management conditions for optimal rearing of eel Anguilla japonica. The production of eel culture was evaluated by the proportion of eels from the main inland fin fish species production in Korea. Elver stocking was assessed by the elver stocking densities of pond and recirculation culture. Rearing facilities were investigated according to the rearing tank size proportion of the pond and recirculation culture. We selected sample farms by region and by size. We visited sample farms and recorded the number of elvers stock for pond area, size of tanks, feed and feed quantity, and the size and number of harvest eels. The production capacity of Jeollanam-do and Jeollabuk-do were 71.9% and 21.3% respectively. This production quantity represented 93.2% of the total Korean eel production quantity. In Jeollanam-do, there are 236 eel farms, 202 pond farms, and 34 recirculation aquaculture facilities. The elvers' first density data by each aquaculture method revealed that elvers' first density varied more in recirculation system farms, as compared to pond aquaculture. In intensive pond farms, the elvers' first density decreased as the size of farm increased. There was a correlation between the size of tank(x) and the facility of a water wheel for dissolved oxygen in pond culture systems(y=0.022x-0.494;
=0.860). Another strong correlation was found between the weight of eel(x) and eel density(y) in pond culture systems(y=283.5x-0.27;
=0.992). Finally, there was a strong correlation between the length of eel(x) and the weight of eel(y) in intensive pond culture(y=0.0005x-3.2783;
=0.9775). The final survival rate did not differ significantly among pond sizes and culture types.
Physiological Changes and Energy Budget of the Sea Squirt Halocynthia roretzi from Tongyeong, South Coast of Korea
Shin, Yun-Kyung ; Jun, Je-Cheon ; Kim, Eung-Oh ; Hur, Young-Baek ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 366~371
DOI : 10.5657/KFAS.2011.0366
The sea squirt Halocynthia roretzi is mainly cultured in Tongyeong, Southern coastal area of Korea. This study presents the physiological rates of respiration, excretion, feeding and assimilation efficiency of the sea squirt Halocynthia roretzi to analyze the SFG(scope for growth) and net growth efficiency, determined during 2007. Oxygen consumption and nitrogen excretion rates increased with a rise in temperature during the summer period whereas feeding rates decreased. The O:N ratio was high during winter(October to February). Assimilation efficiency showed an annual average of 75.4% during the experimental period, except during a period of elevated temperature in July to September(average
). Net growth efficiency(
) was 8.7 to 64.2% except for May to September, when temperature increased at the aquaculture farm. SFG was negative from May to September, reflecting high temperatures and low feeding rates during this period; its highest positive values occurred during winter.
Feeding Habits of the Redbanded Searobin Lepidotrigla guentheri in the Coastal Waters off Gori, Korea
Baeck, Gun-Wook ; Huh, Sung-Hoi ; Choi, Hee-Chan ; Park, Joo-Myun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 372~377
DOI : 10.5657/KFAS.2011.0372
The feeding habits of the redbanded searobin Lepidotrigla guentheri were studied using 186 specimens collected from September to November, 2006, in the coastal waters off Gori, Korea. The sizes of L. guentheri ranged from 7.1 to 16.7 cm total length(TL). L. guentheri is a bottom-feeding carnivore that consumes mainly shrimp, especially Leptochela sydniensis, amphipods, and crabs. Its diet also includes small quantities of stomatopods, mysids, cumaceans, euphausiids, polychaetes, and copepods. Our feeding-strategy graphical method reveled that L. guentheri is a specialized feeder, with a narrow niche width. L. guentheri mainly consumed shrimp of all size classes and did not show significant ontogenetic changes in feeding habits. Smaller individuals(7-11 cm TL) secondly consumed amphipods, with the portion of amphipods in the total diet decreasing as body size increased. Prey size increased significantly as the fish grew in size.
Feeding Habits of Bluefin Searobin Chelidonichthys spinosus around Jeju Island
Kim, Jong-Bin ; Kim, Jung-Yun ; Lee, Dong-Woo ; Choi, Jung-Hwa ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 378~382
DOI : 10.5657/KFAS.2011.0378
The feeding ecology of bluefin searobin Chelidonichthys spinosus around Jeju Island was examined. Specimens were caught every autumn from 2004 to 2007. The primary prey items of C. spinosus included fish, shrimp, and crabs. Chelidonichthys spinosus preyed upon a wide range of sub-pelagic crustacean groups(e.g., Leptochela gracilis, Leptochela sydniensis). This species was also an opportunistic feeder, exploiting the available prey groups in each area(i.e., L. gracilis in the South Sea and East China Sea groups and L. gracilis and L. sydniensis in the Yellow Sea group). The main prey group of this species changed from demersal shrimp to pelagic shrimp with prey environmental changes. Observed ontogenetic shifts in diet were relatively clear despite substantial overlap between the 10 cm and 20 cm C. spinosus groups.
A Quantitative Analysis of GHG Emissions from the Korean Offshore Large Scale Fisheries Using an LCA Method
Lee, Ji-Hoon ; Lee, Chun-Woo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 383~389
DOI : 10.5657/KFAS.2011.0383
The negative fishery factors from an environmental perspective are greenhouse gas emissions due to high fossil fuel use, destruction of underwater ecosystems by bottom trawls, a reduction in resources by fishing, and damage to ecosystem diversity. In particular, the greenhouse gas emissions from fisheries is an important issue based on the Cancun meeting in Mexico in 1992 and the Kyoto protocol in 2005. However, no investigations on the GHG emissions from Korean fisheries have been conducted. Therefore, a quantitative analysis of GHG emissions from the Korean fishery industry is needed as a first step to identify a method to reduce GHG emissions from fisheries. The purpose of this study was to investigate the degree of GHG emitted from fisheries. Here, we calculated the GHG emissions from four main Korean fisheries(i.e., large trawls, large purse seines, Danish seines, and bottom pair trawls) using the life cycle assessment(LCA) method. The system boundary and input parameters for each process level were defined for LCA analysis. The fuel use coefficient of each fishery was also calculated. The GHG emissions from edible seafood were calculated considering different consuming areas. The results will be helpful to understand GHG emissions from Korean fisheries.
Size Selectivity of a Shrimp Beam Trawl for the Southern Rough Shrimp Trachysalambria curvirostris with the Extended SELECT Method
Park, Chang-Doo ; Park, Hae-Hoon ; Kim, Jung-Nyun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 390~396
DOI : 10.5657/KFAS.2011.0390
Southern rough shrimp Trachysalambria curvirostris is exploited mainly by small shrimp beam trawl in coastal regions of Korea. To determine the size selectivity of a shrimp beam trawl for this species, a series of comparative fishing experiments was conducted in the sea adjacent to Geoje Island off the southern cost of Korea in June and November, 2010, using codends with four different mesh sizes(14.2, 17.8, 25.5, and 35.3 mm). The extended Share Each Length's Catch Total(SELECT) analysis method, based on a multinomial distribution, was applied to the fishing data to obtain a master selection curve. The model with the estimated split parameters fit the catch data best. The master selection curve was estimated to be: s(R)=exp(15.183R-7.872)/[1+exp(15.183R-7.872)], where the relative carapace length, R, is the ratio of carapace length to mesh size. The relative carapace length for 50% retention was 0.518, and the selection range was 0.145. The results suggest that codends with a larger mesh size allow more small-sized shrimps to escape.
A Survey of Shrimp Pot Fishery Bycatch and Discard in Funka Bay, Hokkaido, Japan
Kim, Seong-Hun ; Lee, Ju-Hee ; Kim, Hyung-Seok ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 397~402
DOI : 10.5657/KFAS.2011.0397
We surveyed the bycatch and discard of the shrimp-pot fishery in Hokkaido, Japan, three times during the major fishing period in September 2005. The surveyed catches were analyzed to separate bycatch, discard, and landings. To analyze bycatch and discard, we randomly selected 2 shrimp pots from each of 7 sets, for a total of 14 pots per survey. The total bycatch and discards from the rest of the shrimp pots were also analyzed in each survey. The total catch averaged 12 species. Coonstripe and pink shrimp catches averaged 74.7 kg/haul and 12.7 kg/haul, respectively. The weight of the bycatch averaged 33.4 kg/haul. The bycatch consisted mainly of snail fishes(5.1%), brittle stars(5.0%), and short-spined sea urchins(4.1%). Our analysis showed that the ratio of discard was 0.38, the rate of the discard was 27.4%, and the discard per unit effort was 33.4 kg/haul. The Hokkaido shrimp-pot fishermen discarded all of the bycatch except shrimps. Hence, the weight of the bycatch was equal to the weight of the discard. Our results comprise preliminary data that can be used to find ways to reduce bycatch and discard in the shrimp-pot fishery.
A Hydroacoustic Survey Analyzing Fish Populations and Their Distribution Upstream and Downstream of Changzhou Dam, China, Based on Spillway Conditions
Tan, Xichang ; Kang, Myoung-Hee ; Tao, Jiangping ; Li, Xinhui ; Huang, Daoming ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 403~412
DOI : 10.5657/KFAS.2011.0403
Hydroacoustic surveys were performed to clarify the density and spatial distribution of fish upstream and downstream of Changzhou Dam in the Pearl River, China, with regard to the condition of the spillways. Fish were densely distributed in the forebay of the upstream dam and the average fish density was 0.22 individuals/
under open spillways on 24 June 2010, but when the spillways were closed on 25 June 2010, the fish in the upstream dam dispersed and the average fish density decreased to 0.007 individuals/
. Meanwhile, the average fish density in the downstream region was 0.28 individuals/
before the spillway was opened on 24 May 2010, but it decreased to 0.08 individuals/
on 26 June, just after the spillway was closed. The vertical distribution of fish upstream of the dam was not consistent. The target strength (TS) of fish upstream of the dam was larger than that of fish in the downstream region, although the distribution of TS was similar between the upstream and downstream regions. Therefore, we concluded that while numerous fish could swim to the upstream region while the spillways were open, closed spillways obstructed fish migrating upward from the downstream region.
Development of Split-beam Acoustic Transducer for a 50 kHz Fish Sizing Echo Sounder
Lee, Dae-Jae ; Lee, Won-Sub ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 413~422
DOI : 10.5657/KFAS.2011.0413
An improved split-beam transducer for a 50 kHz fish-sizing echo sounder was developed. The main objective of this study was to minimize the side lobe level in the beam pattern and the distance between acoustic centers for adjacent transducer quadrants in the geometrical arrangement of array elements while maintaining a given number of transducer elements and beam width. To achieve these goals, a 32-element planar array transducer (
array with one element in each corner missing) was designed using the Dolph-Chebyshev shading function to suppress side lobes in the array beam pattern and fabricated by arranging the inter-element spacing to be substantially equal to half the wavelength using the transducer element of 0.4 times the wavelength in diameter. The performance characteristics of this split-beam transducer were evaluated in the experimental water tank of
width). In this study, the design goal of the beam width and side lobe level for transmitting a beam pattern was initially set at
and -30 dB, respectively. However, the measured beam width at 3 dB was
in both directions with side lobe levels of -24.7 dB in the horizontal plane and -25.6 dB in the vertical plane. The averaged beam width at -3 dB of the receiving beam patterns for four receiving quadrants was
. The transmitting voltage response was 161.5 dB (re
/V at 1 m) at 50.23 kHz with a bandwidth of 2.16 kHz, and the averaged receiving sensitivity for four receiving quadrants was -178.13 dB (re 1 V/
) at 49.8 kHz with a bandwidth of 2.64 kHz.
Estimation of Angular Location and Directivity Compensation of Split-beam Acoustic Transducer for a 50 kHz Fish Sizing Echo Sounder
Lee, Dae-Jae ;
Korean Journal of Fisheries and Aquatic Sciences, volume 44, issue 4, 2011, Pages 423~430
DOI : 10.5657/KFAS.2011.0423
The most satisfactory split-beam transducer for fish sizing maintains a wide bearing angle region for correct fish tracking without interference from side lobes and lower sensitivity to fish echoes outside of the main lobe region to correctly measure the angular location of free-swimming fishes in the sound beam. To evaluate the performance of an experimentally developed 50 kHz split-beam transducer, the angular location of a target was derived from the electrical phase difference between the resultant signals for the pair of transducer quadrants in the horizontal and vertical planes consisting of 32 transducer elements. The electrical phase difference was calculated by cross-spectral density analysis for the signals from the pair of receiving transducer quadrants, and the directivity correction factor for a developed split-beam transducer was estimated as the fourth-order polynomial of the off-axis beam angle for the angular location of the target. The experimental results demonstrate that the distance between the acoustic centers for the pair of receiving transducer quadrants can be controlled to less than one wavelength by optimization with amplitude-weighting transformers, and a smaller center spacing provides a range of greater angular location for tracking of a fish target. In particular, a side lobe level of -25.2 dB and an intercenter spacing of
= wavelength) obtained in this study suggest that the angular location of fish targets distributing within a range of approximately
without interference from side lobes can be measured.