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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 34, Issue 6 - Nov 2001
Volume 34, Issue 5 - Sep 2001
Volume 34, Issue 4 - Jul 2001
Volume 34, Issue 3 - May 2001
Volume 34, Issue 2 - Mar 2001
Volume 34, Issue 1 - Jan 2001
Selecting the target year
Sargassum confusum for Biosorption of Pb and Cr
SUH Kuen-Hack ; ANN Kab-Hwan ; CHO Moon-Chul ; CHO Jin-Koo ; JIN Hyung-Joo ; HONG Yong-Ki ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 1~6
Biosorption of Pb and Cr by Sargassum confusum was evaluatet at in the various conditions. The uptake capacities for Pb and Cr were 197.5 mg Pb/g biomass and 133.1 mg Cr/g biomass, respectively. The adsorption parameters for Pb and Cr were determined according to the Langmuir and Freundlich model. Biosorption of Pb and Cr was increased with the increase of pH value. Pb and Cr adsorbed by S. confusum could be recovered by desorption process with 0.1 M HCl, 0.1 M
and 0.1 M EDTA. The ratio of Pb desorption was above
, whereas the ratio of Cr desorption was below
Difference of Component Changes in Salt-Fermented Spring and Autumn Anchovy, Engraulis japonicus Sauce during Fermentation
IM Yeong Sun ; PARK Hee Yeol ; CHOI Young Joon ; CHO Young Je ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 7~12
To investigate difference of component changes in salt-fermented spring (SAS) and autumn (AAS) anchovy, Engraulis japonicus sauce during fermentation, various chemical properties were examined at
months intervals during 18 months fermentation, The contents of total and amino nitrogen were higher in SAS than in AAS until 15.7 and 17.4 months fermentation, respectively, but there were no difference after that. The cross point of inosine (HxR) + hypoxanthine (Hx) and uric acid was faster in SAS with 10.6 months fermentation than in AAS with 11.5 months fermentation, After 18 months of fermentation, the SAS was rich in free amino acids, such as glutamic acid, alanine, aspartic acid, valine, lysine in that order, On the other hand, the AAS was rich in free amino acids, such as glutamic acid, leucine, alanine, lysine, isoleucine in that order. Absorbance at 453 nm were higher in SAS than in AAS, and increased gradually during fermentation.
Changes in Plasma Steroid Hormone Level in Rockfish (Sebastes inermis) by the Controlled Water Temperature and Photoperiod
CHANG Young Jin ; LIM Han Kyu ; KWON Joon Yeong ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 13~16
Plasma levels of sex steroid hormones in rockfish, Sebastes inermis were examined monthly in relation to gonadosomatic index (GSI) under a controlled water temperature and photoperiod, The GSI of a control group (C) in female began to increase from November and reached a maximum in January, Sample fish under a controlled water temperature and photoperiod (Tr) were divided into a responded group (Tr-r) and a un-responded group (Tr-n) by the gonadal maturation condition and GSI. The GSI of females in Tr-r reached a maximum in March. But the female GSI in Tr-n kept lower than 1.2 during the experimental period. No differences in male GSI were noticed between C and Tr. The
and testosterone levels of female plasma in Tr reached a maximum in October, later than those in C. In males, these was no difference in 11-ketotestosterone and testosterone between C and Tr. When rockfish was reared in September under the controlled water temperature and photoperiod which were equivalent to those in July, that is two months earlier, the maturation of females was delayed in comparison with C. This finding suggested that delayed maturation in ovary was caused by the secretion of sex steroid hormones in relation to the water temperature and photoperiod of the hypothalamus-pituitary-gonad axis.
Cytogenetic Analysis of Three Centropomid Species in Korea
BANG In Chul ; NAM Yoon Kwon ; NOH Choong Hwan ; PARK Joon-Taek ; HAN Kyoung-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 17~20
Cytogenetic characteristics of three species in Centropomidae (Coreoperca herzi, C. kawamebari and Siniperca schezeri) were evaluated, based on karyologcial analysis, erythrocytic measurement and genome size estimation using flow cytometry. Modal chromosome number of three species was same as 2n=48. Karyotypes were 4SM+44A
T (NF=52) for Coreoperca herzi, 6SM+42 A
T (NF=52) for C. kawamebari and 4SM+44A
T (NF=52) for Siniperca schezeri. Heteromorphic sex chromosome was not found in both sexes of any species examined, Cellular and nuclear volumes of Siniperca schezeri were smaller than those of other two species, Average amounts of cellular DNA contents estimated by flow cytometry were well coincided with erythrocytic sizes. The estimated genome sizes were 1.83, 1.85 and 1.44 pg/cell for C. herzi, C. kawamebari and S. schezeri, respectively.
Studies on Physicochemical and Biological Properties of Depolymerized Alginate from Sea tangle, Laminaria japonicus by Thermal Decomposition 5. Effects of Depolymerized Alginate on Body Weight, Organ, Pancreatic and Small Intestinal Composition, and Small Intestinal Microvilli Structure in Rats
KIM Yuck-Yong ; CHO Young-Je ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 21~26
To examine functionality of depolymerized alginate obtained by hydrolysis of alginate through a heating process at
on gastrointestinal physiology, the changes of body weight, organ weight and length, pancreatic and small intestinal composition, and light microscopy (LM) observation of small intestinal microvilli's appearances were checked in the rats. Rats were fed diets containing
of each depolymerized alginate (HAG-10, HAG-50, HAG-100) and alginate for 35 days, The feeding of 5 and
alginate diets for 35 days significantly depressed the body weight gain, but increased the length and weight of the small intestine and cecum in rats (p<0.01). Pancreatic protease activity was decreased significantly (p<0.01) in all groups except lo/o of HAG-10 diets, but the protein content increased in all groups, However, pancreatic amylase and lipase activities as well as DNA and RNA content were not significantly different. The small intestinal protein and the DNA content were the highest in diets fed
HAG-50; RNA content increased significantly (p<0.01) in all groups except in the fiber-free diets. Light microscopy (LM) observation showed growth of small intestinal microvilli with numerous ridges; the multiplication of the convolution goblet cells in rats fed with diets containing
of HAG-50 were more than others group.
Feeding Selectivity of Postlarvae of White Croaker (Argyrisomus argentatus) in Kwangyang Bay, Korea
CHA Seong-Sig ; PARK Kwang-Jae ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 27~31
To investigate the food organisms and feeding selectivity of the white croaker (Argrosomus argentatus) during the postlarval stage, the gut contents of the postlarvae, captured in Kwangyang Bay in 1995, were observed, The food organisms were composed of copepod egg and nauplius, Codonellopsis sp. and Tintinnopsis spp. The indices of relative importance indicated that the most dominant food item was a copepod nauplius. As white croaker larvae grew, the size of prey items and the selectivity for copepod nauplius increased.
Mass Culture and Dietary Value of Fabrea salina
PARK Chul Hyun ; HUR Sung Bum ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 32~37
Fabrea salina is an euryhaline ciliate living at salt pond. Its size is small as ca.
, and its reproductive rate is high, so that this ciliate has been expected to be a new food organism which will be able to replace rotifer, Brachionus plicatilis. However, the dietary value of F. salina on fish larvae has not yet been verified thoroughly. This research was carried out to understand the mass culture technique and dietary value of this ciliate. In this study, six kinds of phytoplankton and three kinds of grain were tested on growth of the ciliate and optimum temperature, salinity and density of food were also examined for its mass culture. Regarding food for the ciliate, Heterosigma sp. and rice showed the highest growth among the phytoplankton and the grain, respectively. In this study, 229 ciliates per mL was cultured with Heterosigma sp., and 220 ciliates per mL with rice. The optimum temperature for F. salina was
, and salinity ranging from 35 to 95 ppt had no significant difference on its growth. The optimum food density and amount for the ciliate were
cells/mL in Heterosigma sp. and 2.8 g/L in rice, respectively. With respect to dietary value of F. salina, six-day-old larvae of ayu, Plecoglossus altivelis, fed on the ciliate showed the high mortality over
within 3 days, and it was significantly higher than those fed on rotifer. Even though the mass culture of F. salina has been achieved in the study, this ciliate seems to be inadequate as a food organism for fish larvae.
Molt-staging and Setal Morphology of Metapenaeopsis dalei (Decapoda: Penaeidae)
CHOI Jung Haw ; HONG Sung Yun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 38~42
Molt-staging of Metapenaeopsis dalei was determined by microscopic observation on their setal development of dissected uropods, Five major stages (Stage A, B, C, D and E) were defined by the morphology of setal development. Premolt stage (Stage D) can be divided into 4 distinctive substages (
) according to the premolting processes. The setal cones were formed at Stage B under the old cuticle, and the setal shafts were visible at the end of such Stage
. The casting process of the old cuticle lasted less than 1 min. The molt stages in M. dalei thus are generally similar to those of other shrimp species.
Dynamic Motions of Model Fish Cage Systems under the Conditions of Waves and Current
KIM Tae-Ho ; KIM Jae-O ; RYU Cheong-Ro ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 43~50
In order to analyze the dynamic motions of fish cage systems made of a frame and a netting under the conditions of waves and current, the hydraulic model experiment at towing tank and the numerical computation using boundary integral element method based on linear potential theory were carried out on a square and a circular type of fish cage, The computed and measured results for the dynamic motions of model fish cage systems showed that the heave and pitch motions were almost unaffected by the inclusion of nets, while the surge motions were very reduced by drag force acting on them. In addition, irregular wave-induced motions of fish cages included non-negligible 2nd order harmonic components at high frequency nearly twice the wave frequency. The reason why these motions were considered was due to resonance or structural components of frames being overflown and out of water during a wave cycle. It was found that circular type was more desirable structure in the open sea than square one only in the respect of dynamic motions due to waves and current. Further verifications were needed considering hydrodynamic forces, fatigue life, and structure analysis based on long term stochastic waves including frequency and time domain for the purpose of analyzing and designing fish cage systems.
Changes of Gill Tissue and Body Composition of Juvenile Grey Mullet (Mugil cephalus) and Nile Tilapia (Oreochromis niloticus) to the Sharp Salinity Change in a Recirculating Rearing System
HUR Jun Wook ; CHANG Young Jin ; KANG Duck-Young ; LEE Bok Kyu ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 51~56
Changes of gill tissue and body composition of grey mullet (Mugil cephalus) and Nile tilapia (Oreochromis niloticus) by the manipulation of salinity were observed in a recirculating rearing system. Salinity was increased from
for 1 day and remained far 15days, thereafter salinity was decreased from
for 1 day and remained for other 15 days. Any morphological differences of gill lamella in grey mullet were not observed in seawater and freshwater. However, on day 2 in exposure to seawater, Nile tilapia showed the edema and bloodclot in gill lamella. In the case of grey mullet, mitochondria and tubular system of chloride cell were more densely packed according to the salinity increase. The whole body of grey mullet showed no significant differences in moisture content during experimental period. However, moisture content in whole body of the Nile tilapia was signincantly decreased when exposed to seawater. Protein content in whole body of grey mullet showed no significant difference between beginning and day 15 of the experiment.
Temporal and Spatial Variations of Particulate Organic Matter in the Southeastern Coastal Bays of Korea
LEE Pil-Yong ; KANG Chang-Keun ; CHOI Woo-Jeung ; LEE Won-Chan ; YANG Han-Soeb ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 57~69
The chemical, elemental and biochemical components of the suspended particulate matter (SPM) were investigated in order to quantify particulate organic matter (POM) and assess diet quality for suspension feeders in the southern coastal bay systems of Korea where the marine farming of the suspension feeders are most active, The intense field observation program was carried out seasonally in the three coastal bay systems of Chinhae, Gosung and Kangjin bays, The SPM was characterized as collective properties of organic carbon (POC), nitrogen (PON), phosphorus (PP) and more refined collective properties of protein (PPr), carbohydrate (PCHO) and chlorophyll a (Chl a) compound. Although the three coastal bays are regarded as phytoplankton based ecosystem, the SPM is not composed entirely with phytoplankton cells. Due to the shallow water depth, resuspension of bottom sediment contributes significantly to some of the regions. Therefore, concentration of SPM in the surface water did not co-vary with Chl a or PPr, PCHO. In general, temporal variation of POC, PON and Chl a contents in seawater were closely associated with phytoplankton biomass in the three coastal bays, However, PPr and PCHO contents in seawater were higher in Chinhae bay than in Gosung and Kangjin bays and Chl a PPr-N ratio was higher in Chinhae bay than in Kosung and Kangjin bays, since Chinhae bay is more eutrophicated than other bays. Average C : N ratios from regressions of POC and PON of SPM were 6.6, 6.6 and 5.0 in Chinhae, Gosung and Kangjin bays, respectively. SPM in Chinhae and Gosung bays appears to be made of largely phytoplankton cells and SPM in Kangjin bay appears to be contributed from the bacterial biomass due to the shallow water depth. N : P ratios from regressions of PON and PP of SPM were 10.8 and 14.7 in spring, and 18.2 and 24.6 in Chinhae and Gosung bays, respectively. With respect to the hypothetical Redfield molecule, phytoplankton appears to be limited by the lack of N and f in spring and summer, respectively, in the two bays, In Kangjin bay, N : P ratios from regressions of PON and PP of SPM were varied from 6.3 to 12.8 throughout the year. The low N : P ratio with resepct to the hypothetical Redfield molecule, phytoplankton growth appears to be limited by the lack of N-nutrients.
Design and Development of Integrated Recirculating Aquaculture System
SUH Kuen-Hack ; KIM Byong-Jin ; JEON Im Gi ;
Korean Journal of Fisheries and Aquatic Sciences, volume 34, issue 1, 2001, Pages 70~76
An integrated recirculating aquaculture system suitable to our country's situation was designes and developed, The integrated recirculating aquaculture system consisting of a double drain type rearing tank of the
, a sedimentation tank for removal of settleable solids, a floating bead filter for the removal of suspended solids, a foam separator for removal of fine particles and a rotating biological contactor for the nitrification was designed and manufactured. The integrated recirculating aquaculture system was stocked with nile tilapia (Oreochromis niloticus) at
rearing density for 2 weeks. Feed coefficient was 1.4 and average daily growth rate was
in the system for 2 weeks.