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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Fisheries and Aquatic Sciences
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Journal DOI :
The Korean Society of Fisheries and Aquatic Science
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Volume & Issues
Volume 43, Issue 6 - Dec 2010
Volume 43, Issue 5 - Oct 2010
Volume 43, Issue 4 - Aug 2010
Volume 43, Issue 3 - Jun 2010
Volume 43, Issue 2 - Apr 2010
Volume 43, Issue 1 - Feb 2010
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Improvement on the Antioxidant Activity of Instant Noodles Containing Enzymatic Extracts from Ecklonia cava and Its Quality Characterization
Heu, Min-Soo ; Yoon, Min-Seok ; Kim, Hyung-Jun ; Park, Kwon-Hyun ; Lee, Jong-Hyun ; Jo, Mi-Ran ; Lee, Jung-Suk ; Jeon, You-Jin ; Kim, Jin-Soo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 391~399
DOI : 10.5657/kfas.2010.43.5.391
This study was conducted to improve the antioxidative activity of instant noodles containing enzymatic extracts from Ecklonia cava (EEC). EEC has relatively better antioxidative activity than extracts from other indigenous plants in Jeju Island. The EEC (2.5 mg/mL) had 82.5% for the hydroxy radical, 78.4% for the DPPH radical, and 64.9% for the superoxide anion radical scavenging activities, and 65.2% for the cell viability (100
). According to the texture of the dough, the DPPH free radical scavenging of uncooked instant noodles, sensory evaluation of cooked instant noodles, and turbidity of the cooking drip, the optimal EEC concentration was 1.8% for the instant noodles. The major amino acids in the instant noodles with EEC were glutamic acid (24.2%), proline (10.2%), valine (10.0%), and isoleucine (12.3%). The zinc and iron in the instant noodles were enhanced by adding 1.5-1.8% EEC. The antioxidant activity of instant noodles with EEC was 75.4% for the hydroxy radical, 74.1% for the DPPH radical, and 51.2 % for the superoxide anion radical scavenging activities.
Lead Adsorption by Carboxylated Alginic Acid and Its Application in Cleansing Cosmetics
Park, Hee-Yeon ; Jang, Mi-Soon ; Kadnikova, Irina ; Kim, Yeon-Kye ; Lim, Chi-Won ; Yoon, Ho-Dong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 400~405
DOI : 10.5657/kfas.2010.43.5.400
This study investigated lead adsorption by carboxylated alginic acid and its application in cleansing cosmetics. Carboxylated alginic acid showed the highest lead adsorptivity after oxidation in a 4-6 mM hydrogen peroxide solution at
for 30-40 min. Carboxylated alginic acid adsorbed
mg/g of lead dry mass at pH 4-6. Carboxylated alginic acid modified by hydrogen peroxide and potassium permanganate adsorbed
mg/g of lead dry mass, respectively. Carboxylated alginic acid showed higher lead adsorptivity after modification by hydrogen peroxide than by potassium permanganate, with an increase of ~30% compared with raw alginic acid. To access the potential application of carboxylated alginic acid in cleansing cosmetics, we investigated the lead adsorptivity, conditions of the cosmetics procedure, and cytotoxicity of various concentrations of cleansing cosmetics added to 5% carboxylated alginic acid. The ideal cosmetic concentrations combined with 5% carboxylated alginic acid were 70% for peeling gel, 20% for massage cream, 20% for foam cleansing and 40% for cleansing cream. There was no cytotoxicity in cleansing cosmetics combined with 5% carboxylated alginic acid.
Impact of Rainfall Events on the Bacteriological Water Quality of the Shellfish Growing Area in Korea
Lee, Tae-Seek ; Oh, Eun-Gyoung ; Yu, Hyeun-Duck ; Ha, Kwang-Soo ; Yu, Hong-Sik ; Byun, Han-Seok ; Kim, Ji-Hoe ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 406~414
DOI : 10.5657/kfas.2010.43.5.406
The impact of rainfall events on the sanitary indicator bacteria density of the shellfish-growing waters in Geoje Bay and Jaran Bay in Korea was investigated. The shellfish-growing area in Geoje Bay, which is a nearly closed basin, was not affected significantly, except near the stream mouth after 11.5 mm of rainfall in 1 day. However, most of the shellfish-growing water in the bay was polluted by fecal coliform bacteria after rain as heavy as 43.0 mm, and the levels of fecal indicator bacteria in some of the sea near the coast did not recover completely until 24 hours after the rainfall. By contrast, in Jaran Bay, which has no significant pollution source in the drainage area, although 9.3-490 MPN/100 mL of fecal coliform bacteria were detected near the stream mouth after rainfall of 33.5 and 81.0 mm, a very low level of the indicator bacteria was detected in the designated shellfish-growing area. During the investigation, the correlations between the sanitary indicator bacteria density and physical parameters, such as salinity and turbidity, were evaluated. Both the total coliform and fecal coliform densities were inversely correlated with salinity. Turbidity was positively correlated with the indicator bacteria density. The survey results suggest that for more efficient management of the shellfish-growing areas located in coastal areas, such as shellfish harvesting after rainfall, a detailed investigation of the effects of rainfall on the bacterial water quality in each growing area is needed.
Inactivation of a Norovirus Surrogate (Feline Calicivirus) during the Ripening of Oyster Kimch
Shin, Soon-Bum ; Oh, Eun-Gyoung ; Yu, Hong-Sik ; Lee, Hee-Jung ; Kim, Ji-Hoe ; Park, Kun-Ba-Wui ; Kwon, Ji-Young ; Yun, Ho-Dong ; Son, Kwang-Tae ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 415~420
DOI : 10.5657/kfas.2010.43.5.415
In Korea, oysters are used as an ingredient of Kimchi (Korean pickled cabbage) in early winter. Although viral contamination of oysters, including contamination by norovirus, can provoke gastroenteric illness, little is known of the epidemiological relationship to outbreaks. We postulated that Kimchi ripening can reduce the infectivity of norovirus, in order to test this hypothesis, we carried out a model experiment. Since norovirus is currently regarded as non-culturable, feline calicivirus (FCV) was used as a surrogate to examine the activation of norovirus with Kimchi ripening. In commercial well-prepared Kimchi, the infectivity (
) of FCV decreased by 2 log every 12 hours and reached the limit of detection after 48 hours during over-aging at
. During storage at
, the infectivity (
) of FCV decreased slowly and reached 5.00
after 48 hours. The low pH appears to affect the infectivity of FCV directly via organic acids produced by ripening during over-aging and storage. In neutralized lab-prepared Kimchi (pH 7.0), the infectivity (
) of FCV also decreased and reached the limit of detection after 72 hours at
. This indicates that there are substances beside organic acids in Kimchi that originate from the raw materials and are produced during ripening. Among the raw materials, salt-fermented anchovies and garlic showed high direct antiviral activity. The main factor decreasing the infectivity of FCV in Kimchi was the high acidity caused by organic acids, regardless of the type, produced by ripening. Furthermore, unknown secondary products of microorganisms associated with Kimchi ripening and antiviral materials originating from raw material might contribute to the decreased infectivity of FCV, the surrogate of norovirus.
Separation and Purification of Antihypertensive Substances from Edible Seaweeds
Lee, Seung-Joo ; Ha, Wang-Hyun ; Choi, Hye-Jin ; Cho, Soon-Yeong ; Choi, Jong-Won ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 421~427
DOI : 10.5657/kfas.2010.43.5.421
To isolate natural antihypertensive substances from edible seaweeds, we screened for and separated active compounds contained in natural Underia pinnatifida, cultural Underia pinnatifida, Laminaria japonica, Sporophylls and Agarum cribrosum. They were extracted using room temperature water, boiling water, acetone, and methanol in turn or using room temperature water, ether, acetone, methanol and boiling water in order. The in vitro antihypertensive activity was quantified as inhibitory efficacy against angiotensin-I converting enzyme (ACE), which is a factor inducing hypertension. For all of the seaweeds tested, the fractions soluble in room temperature water and in boiling water showed the strongest ACE inhibitory effect among the extracted fractions. Conversely, the methanol-extracted fractions for all of the seaweeds tested showed no antihypertensive activity. While the ether and acetone fractions had slight antihypertensive effects. The compounds in the aqueous extracts that had antihypertensive activity were presumed to be polysaccharides, such as fucoidan and alginate.
Hepatic Detoxification and Antioxidant Activity in Sea-urchin Roe and Ethanol Extract of Roe
Lee, Seung-Joo ; Ha, Wang-Hyun ; Choi, Hye-Jin ; Cho, Soon-Yeong ; Choi, Jong-Won ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 428~436
DOI : 10.5657/kfas.2010.43.5.428
Sea-urchins (Anthocidaris crassispina) are widely distributed in the East Sea of Korea. The aim of this study was to evaluate the hepatoprotective effects of sea-urchin roe on bromobenzene (BB)-induced liver damage in rats. The antioxidative and detoxifying properties of sea-urchin roe in BB-poisoned rat liver was examined by chemical analysis of serum aminotransferase (AST, ALT), glutathione S-transferase (GST),
-glutamylcystein synthetase, glutathione reductase, epoxide hydrolase, amino-N-demethylase (AD), aniline hydrolase (AH) enzyme activity, as well as lipid peroxide and glutathione contents. Sea-urchin roe inhibited the increase of serum AST, ALT enzyme activity. Increasing lipid peroxide contents and AD and AH activities were significantly decreased in ethanol extract of sea-urchin roe. GST,
-glutamylcystein synthetase, glutathione reductase and epoxide hydrolase enzyme activities increased in sea-urchin roe-fed group, compared with the BB-treated group. These results suggest that sea-urchin roe facilitates recovery from liver damage by enhancing antioxidative defense mechanisms and hepatic detoxication metabolism.
ACE, α-Glucosidase and Cancer Cell Growth Inhibitory Activities of Extracts and Fractions from Marine Microalgae, Nannochloropsis oculata
Cha, Seon-Heui ; Kim, Min-Joo ; Yang, Hye-Young ; Jin, Chang-Beum ; Jeon, You-Jin ; Oda, Tatsuya ; Kim, Dae-Kyung ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 437~444
DOI : 10.5657/kfas.2010.43.5.437
Extracts of the marine microalgae Nannochloropsis oculata were obtained using 80% methanol (MeOH) and water. The 80% MeOH extract was further fractionated with n-hexane, chloroform, ethyl acetate (EtOAc), n-butanol (n-BuOH), and water to isolate the active fraction. Seven samples were prepared and their angiotensin converting enzyme (ACE),
-glucosidase, and cancer cell growth inhibitory activities in vitro were determined. The most profound ACE inhibitory activity was observed in the chloroform fraction, while the others had moderate effects. By contrast, greater
-glucosidase inhibitory activity was found in the EtOAc fraction, n-hexane fraction, and water extract of N. oculata. The antiproliferative effects of the extracts and fractions against HL-60, U937, CT-26, and SK-Hep1 cancer cells were also determined. The n-BuOH fraction had the strongest antiproliferative effects on CT-26 cells in a time-dependant manner (P<0.05). These results suggest that the extracts and fractions from N. oculata could be used as a potential functional food or as pharmaceutical ingredients.
Effects of Dietary Lipid Sources on the Growth and Body Composition of the far Eastern Catfish, Silurus asotus
Kim, Kyoung-Duck ; Kim, Jin-Do ; Lim, Sang-Gu ; Kang, Yong-Jin ; Son, Maeng-Hyun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 445~450
DOI : 10.5657/kfas.2010.43.5.445
This study investigated the effects of dietary lipid sources on growth performance and body composition of juvenile far eastern catfish, Silurus asotus. Three replicate groups of fish (average weight 3.6 g) were fed with one of the following experimental diets containing 10% beef tallow (BT), 5% BT plus 5% corn oil (CO), 5% BT plus 5% linseed oil (LO), or 5% BT plus 5% squid liver oil (SO) as the lipid source for 5 weeks. No significant difference was observed in the survival among groups. The weight gain of fish fed the LO (high in 18:3n-3) and SO (high in n-3 highly unsaturated fatty acid) diets was significantly higher than that of the fish fed the CO (high in 18:2n-6) and BT diets (P<0.05). The feed efficiency of fish fed LO and SO diets was significantly higher than that of the fish fed the BT diet (P<0.05), but not significantly different from that of the fish fed the CO diet. The protein efficiency ratio of fish fed the SO diet was significantly higher than that of fish fed the CO and BT diets (P<0.05), but not significantly different from that of fish fed the LO diet. The 18:1n-9 of whole-body polar lipid fraction in fish fed the BT diet increased compared to that of fish fed the other diets. Fish fed the CO and LO diets had significantly higher contents of 18:2n-6 and 20:4n-6, and 18:3n-3, than the fish fed the other diets in polar and non-polar lipid fractions, respectively (P<0.05). Significantly higher contents of 20:5n-3 and 22:6n-3 were observed in the whole-body polar lipid fraction of fish fed the SO diet compared with fish fed the other diets (P<0.05). The study results indicate that linseed oil and squid liver oil containing n-3 fatty acids are good dietary lipid sources for the growth of far eastern catfish.
Quality Characteristics of Olive Flounder Muscle Fed with Extruded Pellet and Raw Fish-Based Moist Pellet
Kim, Kang-Woong ; Kim, Kyoung-Duck ; Kim, Shin-Kwon ; Son, Maeng-Hyun ; Jang, Mi-Soon ; Kang, Yong-Jin ; Bai, Sung-Chul C. ; Lee, Kyeong-Jun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 451~456
DOI : 10.5657/kfas.2010.43.5.451
This study was conducted to evaluate the quality characteristics (proximate composition, fatty acids, amino acids, sensory and textural properties) of whole body and dorsal muscle of olive flounders fed extruded pellets (EP) compared to raw fish-based moist pellets (MP). The olive flounders in this study were reared from 300 g to 1000 g for 7 months by feeding either EP or MP. The fatty acids and total amino acids of the whole body and dorsal muscle of the fish were similar among both groups. The major fatty acids in whole body and dorsal muscle werepalmitic acid and oleic acid. Finally, no significant differences were observed between groups for sensory and textural properties of the muscle. These results suggest that EP could be developed to replace MP without adverse effects on olive flounder quality.
Comparison of Growth Parameters in Selected and Unselected Strains of Olive Flounder Paralichthys olivaceus
Min, Byung-Hwa ; Kim, Hyun-Chul ; Lee, Jeong-Ho ; Noh, Jae-Koo ; An, Hye-Suck ; Park, Choul-Ji ; Choi, Sang-Jun ; Myeong, Jeong-In ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 457~461
DOI : 10.5657/kfas.2010.43.5.457
To estimate the effect of selective breeding on the improvement of growth in olive flounder Paralichthys olivaceus, we compared the growth of a strain selected for rapid growth to that of an unselected strain from a commercial hatchery. The fish strains were fed with either moist pellets (MP) (dry matter, 59.8% crude protein; 14.1% lipid) or extruded pellets (EP) (dry matter, 50.4% crude protein; 13.8% lipid) for 190 days and were reared under similar conditions. The mortality rates were less than 2% and were not significantly different among the experimental groups. The growth rate of the selected fish was significantly greater than that of the unselected fish regardless of the diet type, and both strains fed MP grew significantly faster than those fed EP. The selected fish consumed more feed than the unselected fish. However, there was no significant difference in the feed efficiency between the selected and unselected fish. These results demonstrate that the selected fish exhibited superior growth rates, and that this was associated with a greater intake of food. Thus, selective breeding may be useful for improving the growth of commercial olive flounder.
Hybridization between Marine Medaka Oryzias dancena and Javanese Medaka Oryzias javanicus
Song, Ha-Yeun ; Nam, Yoon-Kwon ; Bang, In-Chul ; Kim, Dong-Soo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 462~473
DOI : 10.5657/kfas.2010.43.5.462
Inductions of hybrids and reciprocal hybrids between Oryzias dancena and O. javanicus (ODJ and OJD) were conducted and backcross hybrids between female O. dancena and male ODJ were also produced for biological and cytogenetic analysis. Embryonic development of ODJ and OJD were compared with those of their parents. Developmental time was fastest in O. dancena and ODJ, followed by O. javanicus and OJD. Oryzias dancena hatched 11 days (d) after fertilization, ODJ at 13 d, O. javanicus at 14 d and OJD at 15 d. The abnormality of external morphology rate in ODJ was 10.6%; however, OJD showed a high degree of abnormality, over 90%. The proportion of males was 90.0% and 31.3% for ODJ and OJD, respectively. Cytogenetic analysis was conducted to obtain basic information for genetic identification of O. dancena, O. javanicus and their hybrids. The karyotypes of all experimental groups showed 2n=48 chromosomes and the fundamental number (FN) was 48. The first pair carried secondary constrictions near the centromeric regions. Erythrocyte area and volume were
, respectively, for O. dancena,
in O. javanicus, and
in ODJ. Erythrocyte area and volume in ODJ were similar to those of O. javanicus. In backcross hybrids between female O. dancena and male ODJ, all embryos failed to develop and died in the late gastrula stage.
Sperm Collection Time, Sex Steroid Hormones, and Gonadal Development of Black Porgy, Acanthopagrus schlegeli, Acclimated in Freshwater
Jeong, Min-Hwan ; Lim, Han-Kyu ; Kim, Young-Soo ; Kim, Su-Yeon ; Chang, Young-Jin ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 474~481
DOI : 10.5657/kfas.2010.43.5.474
The sperm collection time, sex steroid hormones, and gonadal development of protandrous black porgy, Acanthopagrus schlegeli, acclimated in freshwater for more than 2 years were investigated to evaluate its reproductive capability. The gonadal development of black porgy reared in seawater and freshwater could each be classified into four successive stages. For black porgy reared in seawater (BSW) as the control, these were the growing (December to February), mature (February to March), spent (March to June), and degeneration and resting (July to December) stages; for black porgy reared in freshwater (BFW), these were the growing (November to January), mature (January to February), spent (February to May), degeneration and resting (June to November) stages. In both BSW and BFW, the plasma cortisol levels were the highest in March. The plasma testosterone (T) levels of BSW and BFW were the highest in March and February, respectively. The plasma estradiol-
) levels did not differ significantly between BSW and BFW. The 11-ketotestosterone (11-KT) levels in the plasma of BSW and BFW were the highest in April. Sperm was collectible from March to June in BSW and from February to May in BFW. The results indicated that the gonadal maturation of BFW was about 1 month faster than that of BSW.
Validation of Morphology-based Identification of Two Cynoglossidae Larvae using Mitochondrial DNA
Kwun, Hyuck-Joon ; Kim, Jin-Koo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 482~488
DOI : 10.5657/kfas.2010.43.5.482
Three specimens of Cynoglossidae larvae were collected from the southern Korean Sea in May and August of 2009, and were identified using morphological and molecular analysis. Specimens were divided into two groups based on the number of elongated dorsal fin rays on the top of the head: Cynoglossidae sp. A was defined as having two elongated dorsal fin rays, while Cynoglossidae sp. B possessed a single elongated dorsal fin ray. One specimen of Cynoglossidae sp. A, a post-larva with a notochord length (NL) of 5.8 mm was thought to be a Cynoglossus joyneri larva based on the presence of 115 dorsal pterogiophores, 85 anal pterogiophores, and 50 myomeres. Two specimens of Cynoglossidae sp. B, a 4.1 mm NL larva and a 11.3 mm NL juvenile, were thought to be Cynoglossus abbreviatus based on the presence of yolk in the former and 133 dorsal fin rays, 105 anal fin rays, and 63 myomeres in the latter. To test this morphology-based identification, molecular analysis was conducted using 419-422 bp of mitochondrial DNA 16S rRNA. Cynoglossidae sp. A was clearly matched to a Cynoglossus joyneri adult (d=0.000) and Cynoglossidae sp. B clustered closely with Cynoglossus abbreviatus adults (d=0.002). A neighbor-joining tree supported this robust relationship (bootstrap value=100%). Therefore, these molecular data validate the morphological identification of the two Cynoglossidae larval species.
Variations in Reserved Nutrient Consumption and Growth of Pacific Oyster (Crassostra gigas) Larvae during Starvation
Hur, Young-Baek ; Kim, Tae-Eic ; Lee, Seung-Ju ; Hur, Sung-Bum ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 489~494
DOI : 10.5657/kfas.2010.43.5.489
The nutritional demand of oyster larva (Crassostrea gigas) were investigated to determine the optimal culture conditions and improve micro-algae utilization. Changes in nutrients and shell growth were examined in fed and 96-h (48 h in late umbone stage) oysters at four larval stages. Shell growth increased significantly in D shape larvae, regardless of feeding variations. No growth was observed in starved larvae, except in shell length of umbone (to 11.9
). Fed larvae showed significant growth in all development stages (P < 0.05). During starvation, lipids were most significantly decreased in all larval stages (by 76.8%, 68.3%, 76.3%, and 40.3%, respectively), followed by protein (41.1%, 31.1%, 33.1%, 16.7%) and nitrogen-free extracts (40.8%, 24.3%, 36.9%, 20.1%), Gross energy (kcal/g) consumption in each larval stage was 49.6%, 35.1%, 39.1%, and 20.4%, respectively. Our results indicate that lipids are the most important energy source during the early larval development stages of C. gigas.
Isolation and Characterization of Pure lines of Pigmentation and Morphological Mutants in Porphyra tenera Kjellman (Bangiales, Rhodophyta)
Hwang, Mi-Sook ; Kim, Seung-Oh ; Lee, Young-Soon ; Park, Eun-Jeong ; Kim, Seong-Cheol ; Ha, Dong-Soo ; Gong, Yong-Gun ; Baek, Jae-Min ; Choi, Han-Gu ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 495~502
DOI : 10.5657/kfas.2010.43.5.495
Pure lines were isolated from young gametophytic blades of pigmentation and morphological mutants in Porphyra tenera. Growth, blade-shape and photosynthetic pigment content of pure lines were compared with the wild type. Growth of blade length in the wild type (W, R-B), with round shape and brown color, was fastest at
and became slower as temperature increased. The blade-shape of the wild type changed from linear to round as temperature increased. The green type (R-G), with round shape and green color, showed slower growth, and the red type (R-R) 'with round shape and red color' showed faster growth than the wild type. The blade-shapes of the green and red types changed from elliptical or linear to round as temperature increased. The phycoerythrin (PE) / phycocyanin (PC) ratio of the green type was markedly lower and the PE/PC ratio of the red type was markedly higher than that of the wild type. The linear type (L-B), with liner shape and brown color, showed faster growth in blade length than the wild type at
and maintained its linear shape at
. The content of photosynthetic pigments of the linear type was similar to that of the wild type. Each of the pure lines of pigmentation and morphological mutants that were isolated in the present study showed particular patterns in growth, blade-shape and photosynthetic pigment composition. Therefore, they are expected to be useful as new varieties by themselves and to be available for breeding and biotechnological studies.
Seasonal and Interannual Variation in Species Composition and Abundance of Decapod Assemblages Collected using Pots in the Coastal Waters off Gori, Korea
Huh, Sung-Hoi ; Park, Joo-Myun ; Jeong, Dal-Sang ; Baeck, Gun-Wook ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 503~509
DOI : 10.5657/kfas.2010.43.5.503
The seasonal and interannual variation in the species composition and abundance of the decapod assemblage (shrimps, crabs, and hermit crabs) collected using pots in the coastal waters off Gori were studied between 2005 and 2008. During the study period, 49 decapod species belonging to 19 families were collected. The dominant species were Crangon hakodatei, Pandalus gracilis, Carcinoplax longimana, Charybdis bimaculata, Carcinoplax vestita, Diogenes edwardsii, and Dardanus arrosor. These seven species accounted for 95.46% of the total number of individuals collected. The number of species, number of individuals, biomass, and species diversity indices fluctuated with the seasons. The peak number and biomass of individuals occurred in July 2006. The number and biomass of individuals were higher in summer and lower in winter, and the diversity indices were lower in summer than in the other seasons. The abundance of dominant species showed some seasonal and interannual change; in particular, those of C. hakodatei and P. gracilis corresponded with the bottom water temperature.
Seasonal Variation of Fish Assemblages on Jangbong Tidal Flat, Incheon, Korea
Seo, In-Soo ; Hong, Jae-Sang ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 510~520
DOI : 10.5657/kfas.2010.43.5.510
This study investigated the community structure and seasonal variation of the fish assemblages on Jangbong tidal flat, Incheon, Korea. Fish were collected monthly using a small otter trawl from November 1999 to January 2001. Thirty-six fish species were recorded, with a mean density of 185 individuals and biomass of 2,594.3 gWWt. The most abundant species by number were Johnius grypotus (23.7%), Acanthogobius hasta (17.8%), and Cynoglossus joyneri (10.7%), while the dominant species by catch weight were Acanthogobius hasta (21.2%), Sebastes schlegeli (16.2%), J. grypotus (14.0%), and C. joyneri (10.8%). Cluster analysis and non-metric multi-dimensional scaling (nMDS) were applied to assess the seasonal fluctuation in the fish assemblages. Based on the result of the cluster analysis and nMDS ordination, the faunal group could be divided into cold- and warm-water specialist groups. The cold-water specialists included A. hasta, Acanthogobius luridus, Triaenopogon barbatus, Tridentiger trigonocephalus, and Liza haematocheila. The warm-water specialists were J. grypotus, C. joyneri, S. schlegeli, and Hexagrammos otakii. In conclusion, the community structure showed a distinct seasonal trend, which seemed to be related to the seasonal fluctuations in water temperature.
Temporal Variation of the Macro-crustacean Assemblages on Jangbong Tidal Flat, Incheon, Korea
Seo, In-Soo ; Hong, Jae-Sang ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 521~531
DOI : 10.5657/kfas.2010.43.5.521
This study examined the community structure and temporal variation of the macro-crustaceans on Jangbong tidal flat, Incheon, Korea. Macro-crustaceans on this tidal flat were collected using a modified otter trawl from November 1999 to January 2001. The macro-crustaceans comprised 32 species, 7,741 individuals, and 29,211.3 gWWt during the study period. The Jangbong tidal flat was dominated numerically by three shrimp (Palaemon carinicauda, Crangon affinis, and Metapenaeus joyneri) and two portunid crabs (Charybdis japonica and Portunus trituberculatus). The macro-crustacean assemblages were divided into two different season and species groups based on the q-mode and r-mode clustering methods. In terms of q-mode, they consisted of a winter species group from December through April and a summer species group from May through November. The r-mode analysis showed that the species group visiting the tidal flat in winter was dominated numerically by palaemonid and crangonid shrimps, while a species group characterized by an abundance of portunid crabs and penaeid shrimps was more frequent in spring, summer, and autumn. In conclusion, our study revealed distinct temporal variation in the tidal flat use by macro-crustaceans around Jangbong Island, Incheon, Korea.
Marine Algal Flora and Community Structure in Daejin on the Mid-East Coast of Korea
Kim, Young-Dae ; Gong, Yong-Gun ; Jeon, Chang-Yeong ; Song, Hong-In ; Park, Mi-Seon ; Lee, Chae-Sung ; Yoo, Hyun-Il ; Kim, Young-Hwan ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 532~539
DOI : 10.5657/kfas.2010.43.5.532
Seaweed biomass was estimated in the rocky subtidal zone of Daejin on the mid-east coast of Korea using a destructive sampling method from February to November 2007. Monthly sampling was conducted at depths of 5, 10 and 15 m using 50
50 cm quadrats. A total of 73 species, including 5 chlorophytes, 25 phaeophytes, 43 rhodophytes and one seagrass were identified. Average seaweed biomass was 2,852.3 g wet wt.
and biomass values varied monthly from 1,189.8 g to 7,523.7 g. The species dominant in biomass were Laminaria japonica (481.7 g), Sargassum confusum (470.85 g), Undaria pinnatifida (422.57 g), Costaria costata (282.16 g), Odonthalia corymbifera (174.46 g), S. sagamianum (163.22 g) and S. horneri (122.18 g). The vertical distribution of algae was characterized by S. confusum and U. pinnatifida at 5 m, L. japonica and U. pinnatifida at 10 m, and O. corymbifera and L. japonica at 15 m depth. The C/P, R/P and (R+C)/P values were 0.20, 1.72 and 1.92, respectively.
Distribution Characteristics of Alkaline Phosphatase Activity and Phosphatase Hydrolyzable Phosphorus in Northern Gamak Bay in Autumn and Winter, 2009
Kwon, Hyeong-Kyu ; Oh, Seok-Jin ; Yang, Han-Soeb ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 540~546
DOI : 10.5657/kfas.2010.43.5.540
We investigated variations in alkaline phosphatase (APase) activity and alkaline phosphatase hydrolyzable phosphorus (APHP) in northern Gamak Bay from September to December 2009. Dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) decreased gradually, and the DIN/DIP ratio was higher than the Redfield ratio (16) based on molecular concentrations during most of the observation period. The total APase (T-APase) activity increased with decreasing DIP concentration; i.e., the Relationship between T-APase and DIP showed a high negative correlation (r=-0.80, P<0.001), with APase activity being a good indicator of DIP limiting the Redfield ratio. The T-APase was positively correlated with the concentration of chlorophyll a (r=0.73, P<0.001). This suggests that a major portion of APase activity in northen Gamak Bay seawater is attributed to phytoplankton. The proportion of APHP among dissolved organic phosphorus (DOP) was low in September and high in November. Thus, APase-producing phytoplankton may be able to grow by utilizing APHP as a phosphorus source in autumn when DIP is limiting. Thus, APase activity and the use of DOP by phytoplankton may play an important role in the growth of phytoplankton under DIP limiting conditions such as those of northern Gamak Bay.
Annual Variations in Fisheries Productivity Index in Jinhae Bay
Kang, Min-Hea ; Lee, In-Cheol ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 547~550
DOI : 10.5657/kfas.2010.43.5.547
Jinhae Bay is a typical aquaculture farm with active fisheries. However, it has been contaminated by the development of a major city and industrial area, and has therefore diminished in value as a fishing ground. To preserve the continuing productivity of the ocean, we have to estimate fisheries resources. To analyze the fisheries resources in Jinhae Bay, we evaluated the Fisheries Productivity Index (FPI). The FPI is composed of the Total production (
), Total amount (
), and Production of edible protein (
), nitrogen (
) and phosphorous (
). To calculate the FPI, we used Annual statistics on cooperative sales of fishery products data from 1979 to 2004 and the Food composition table. The results of the FPI were as follows.
ranged from 70,235 tons to 113,556 tons and
ranged from 107,004 million won to 373,776 million won.
ranged from 8,124 tons to 13,357 tons,
ranged from 1,965 tons to 3,273 tons, and
ranged from 168 tons to 276 tons. According to the FPI, maximum fisheries productivity occurred in 1994, when
were at their highest values.
Characteristics of Acoustic Scattering according to Pulsation of the Large Jellyfish Nemopilema nomurai
Yoon, Eun-A ; Hwang, Doo-Jin ; Hirose, Miyuki ; Kim, Eun-Ho ; Mukal, Tohru ; Park, Byung-Soo ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 551~556
DOI : 10.5657/kfas.2010.43.5.551
The large jellyfish Nemopilema nomurai causes serious damage to fisheries, particularly around the seas of Korea and Japan. Decreasing this damage requires knowledge of the distribution and abundance of jellyfish. Acoustic technology using quantitative echosounders is one method of studying the distribution and abundance of jellyfish. Such methods are commonly used worldwide because they have the advantage of providing substantial information about all water layers in a wide area in a short time. However, in order to conduct an acoustic survey, the acoustic characteristics of the target organism must be known. These can be altered by a number of factors, including pulsation, swimming angle, frequency and size. Accordingly, this study determined the variation in target strength according to pulsation of N. nomurai. Data were analyzed for two jellyfish with bell diameters in air of (a) was 32.0 and (b) 25.0 cm. The pulsation cycle of jellyfish (a) was 1.5~2.0 sec and the target strength (TS) cycle was 1.0~2.5 sec, while jellyfish (b) had a pulsation cycle of 1.0~1.5 sec and TS cycle of 1.0~3.0 sec. The variation width of the TS with the change in pulsation was 7.8 dB (-72.4~-64.6 dB) for jellyfish (a) and 10.3 dB (-71.6~-61.3 dB) for jellyfish (b). The variation in bell diameter was about 0.28 and 0.35, respectively. These results confirmed that the variation in bell diameter caused by pulsation is closely related to the variation in TS.
Growth Performance, Hematological Parameter and Fatty Acid Composition of Growing Olive Flounder (Paralichthys olivaceus) to Dietary Inclusion of Kelp Meal, Krill Meal, Garlic Powder or Citrus Meal
Seo, Joo-Young ; Kim, Kyoung-Duck ; Son, Maeng-Hyun ; Lee, Sang-Min ;
Korean Journal of Fisheries and Aquatic Sciences, volume 43, issue 5, 2010, Pages 557~561
DOI : 10.5657/kfas.2010.43.5.557
This feeding experiment was conducted to investigate the effects of dietary inclusion of some additives on growth performance, hematological parameter and fatty acid composition of growing flounder. Triplicate groups of fish (average weight 120 g) were fed one of five diets containing 5% kelp meal (Ke), 10% krill meal (Kr), 1% garlic powder (Ga), 1% citrus meal (Ci) or control diet (Con) without supplementation for 15 weeks. After the feeding experiment, survival was not significantly different among the groups fed the different diets. Weight gain of fish fed the Ci diet was significantly higher than that of fish fed the Kr diet, but not significantly different from Con, Ke and Ga treatments. Feed efficiency and protein efficiency ratio of fish fed the Ga diet were significantly higher than those of fish fed the other diets. Total protein, glucose, GOT, GPT and total cholesterol contents in the plasma were not affected by the dietary additives. Composition of C20:4n-6 in the dorsal muscle of fish fed the Con diet was significantly higher than that of fish fed the other diets. The results of this study suggest that the dietary inclusion of garlic meal at 1% may improve feed utilization of growing flounder.