The Experts below are selected from a list of 1095 Experts worldwide ranked by ideXlab platform
Soongyu Byun - One of the best experts on this subject based on the ideXlab platform.
-
effect of feeding frequency on the growth of juvenile starry flounder Platichthys stellatus
Korean Journal of Fisheries and Aquatic Sciences, 2019Co-Authors: Kim Heesung, Jin Choi, Hyun Jeong Lim, Min Hwan Jeong, Chae Sung Lee, Soongyu ByunAbstract:Effects of feeding frequency on the growth performance of juvenile starry flounder Platichthys stellatus were investigated. One thousand fifty fishes were distributed into 15 of 500-L flow-through tanks. Triplicate groups of were fed experimental diet with five feeding frequency (one meal every two ...
-
Morphological Analysis of Blind-Side Hypermelanosis of the Starry Flounder, Platichthys stellatus during Early Development.
Development & reproduction, 2014Co-Authors: Duk-young Kang, Soongyu Byun, Jeongin Myeong, Hyo-chan Kim, Byoung-hwa MinAbstract:In Pleuronectiformes, blind-side malpigmentation (hypermelanosis) is common in cultured flatfishes, and is economically important. To understand the mechanism of blind-side hypermelanosis in flatfishes, we examined when the malpigmentation initially occurred, and studied how the symptoms proceeded during early development of the starry flounder, Platichthys stellatus. To assess quantitative pattern changes of blind-side skin, we observed morphological development of the whole body from 22 (total length [TL] 10.0±0.2 mm and body weight [BW] 8.8±0.57 mg) to 110 days (TL 23.4±0.7 mm, BW 193.6±23.3 mg) after hatching (DAH), and also examined the malpigmented area rate of blind-side skin and the malpigmented fish ratios. The experimental animals were reared in fiberglass-reinforced plastic (FRP) tanks in water at a temperature of 18.9±1.9°C and salinity of 32.6±0.6 psu and were fed with rotifer and Artemia nauplii from 22 to 48 DAH, and with A. nauplii and commercial feed from 49 to 110 DAH. As results, the first staining patch seen by the naked eye was observed around the area between the anus and pelvic fin or caudal edge of the trunk at 80 DAH (TL 20.6±0.5 mm, BW 112.5±8.8 mg). The pigmented area and the pigmented fish ratios were significantly increased from 80 to 110 DAH. These results indicated that malpigmentation on the blind side of starry flounder was initially observed at about 2 cm in length and 100 mg in weight, and the pigmented domain on the blind-side skin was continually broadened by the differentiation of pigmented cells (melanophores and xanthophores) with growth.
-
Wild and Hatchery Populations of Korean Starry Flounder (Platichthys stellatus) Compared Using Microsatellite DNA Markers
International journal of molecular sciences, 2011Co-Authors: Soongyu Byun, Yicheong Kim, Jang Wook Lee, Jeongin MyeongAbstract:Starry flounder (Platichthys stellatus) is an important sport and food fish found around the margins of the North Pacific. Aquaculture production of this species in Korea has increased because of its commercial value. Microsatellite DNA markers are a useful DNA-based tool for monitoring the genetic variation of starry flounder populations. In this study, 12 polymorphic microsatellite DNA markers were identified from a partial genomic starry flounder DNA library enriched in CA repeats, and used to compare allelic variation between wild and hatchery starry flounder populations in Korea. All loci were readily amplified and demonstrated high allelic diversity, with the number of alleles ranging from 6 to 18 in the wild population and from 2 to 12 in the farmed population. A total of 136 alleles were detected at the 12 microsatellite loci in the two populations. The mean observed and expected heterozygosities were 0.62 and 0.68, respectively, in the hatchery samples and 0.67 and 0.75, respectively, in the wild samples. These results indicate lower genetic variability in the hatchery population as compared to the wild population. Significant shifts in allelic frequencies were detected at eight loci, which resulted in a small but significant genetic differences between the wild and hatchery populations (FST = 0.043, P < 0.05). Further studies with additional starry flounder sample collections are needed for comprehensive determinations of the genetic varieties between the wild and hatchery populations. These microsatellite loci may be valuable for future population genetic studies, monitoring the genetic variation for successful aquaculture management and the preservation of aquatic biodiversity.
-
Wild and Hatchery Populations of Korean Starry Flounder (Platichthys stellatus) Compared Using Microsatellite DNA Markers
2011Co-Authors: Soongyu Byun, Yicheong Kim, Jang Wook Lee, Jeongin MyeongAbstract:Abstract: Starry flounder (Platichthys stellatus) is an important sport and food fish found around the margins of the North Pacific. Aquaculture production of this species in Korea has increased because of its commercial value. Microsatellite DNA markers are a useful DNA-based tool for monitoring the genetic variation of starry flounder populations. In this study, 12 polymorphic microsatellite DNA markers were identified from a partial genomic starry flounder DNA library enriched in CA repeats, and used to compare allelic variation between wild and hatchery starry flounder populations in Korea. All loci were readily amplified and demonstrated high allelic diversity, with the number of alleles ranging from 6 to 18 in the wild population and from 2 to 12 in the farmed population. A total of 136 alleles were detected at the 12 microsatellite loci in the two populations. The mean observed and expected heterozygosities were 0.62 and 0.68, respectively, in the hatchery samples and 0.67 and 0.75, respectively, in the wild samples. These results indicate lower genetic variability in the hatchery population as compared to the wild population. Significant shifts in allelic frequencies were detected at eight loci, which resulted in a small but significant genetic differences between the wild and hatchery populations (FST = 0.043
-
diel rhythm of oxygen consumption of the starry flounder Platichthys stellatus by water temperature
Korean Journal of Fisheries and Aquatic Sciences, 2008Co-Authors: Soongyu Byun, Sang Un Park, Min Hwan Jeong, Jongha Lee, Yicheong Kim, Beaik Lee, Youngjin ChangAbstract:Diel rhythm of oxygen consumption (OC) of the starry flounder Platichthys stellatus was measured at different water temperatures in a closed recirculating seawater system with a respiratory chamber. The fish consumed 70.5, 79.7, and 90.6 mg at 15, 20, and , respectively, showing a linear increase in OC with water temperature. The OC of fish showed a clear diel rhythm, with lower values during the day and higher values at night, in accordance with the light (09:00-21:00) and dark (21:00-09:00) phases of the diel cycle (12L:12D) in water at 15 and . However, the OC of the fish showed an unclear diel rhythm with the light and dark phases of the diel cycle at . The respective OC at 15, 20 and was 63.8, 72.4, and 88.4 mg during the light phases and 77.2, 87.1, and 92.8 mg during the dark phase. The starry flounder is thought to be a nocturnal fish with a higher OC at night, while it rests during the day. Its OC was the most stable in the light, when it did not feed. Consequently, the night-time OC is the active OC and the day-time OC is the resting OC in the starry flounder.
Youngjin Chang - One of the best experts on this subject based on the ideXlab platform.
-
Influences of Temperature and Density on the Feeding Growth, and Blind-side Malpigmentation of Fry Starry Flounder Platichthys stellatus
2016Co-Authors: Duk-young Kang, Won-jin Kim, Hyo-chan Kim, Youngjin ChangAbstract:To examine the influences of water temperature and stocking density on feeding, growth and blind-side hypermelano-sis of the starry flounder Platichthys stellatus, we performed an experiment with fry at two densities: 2 and 8 fish/L. The fry had a total length of 3.2±0.1 cm, body weight 0.6±0.1 g, and pigmented patches (pigmented ratio 2.6±0.4 %) on the blind side. Duplicate experiments were conducted in 93.7 L glass tanks for 120 days, from July to November. We determined daily food intake (DFI), food efficiency (FE), growth, survival rate, ratio of hypermelanic fish, and pigmented area rate on the blind side at 60-day intervals. The DFI was less than 50 mg/fish/day, and growth was de-layed from July to September (water temperature [WT]> 20℃). After October, when WT < 20℃, the DFI increased significantly and the growth was accelerated, suggesting that the rearing temperature of starry flounder in artificia
-
influences of temperature and density on the feeding growth and blind side malpigmentation of fry starry flounder Platichthys stellatus
Korean Journal of Fisheries and Aquatic Sciences, 2014Co-Authors: Duk-young Kang, Won-jin Kim, Hyo-chan Kim, Youngjin ChangAbstract:To examine the influences of water temperature and stocking density on feeding, growth and blind-side hypermelanosis of the starry flounder Platichthys stellatus, we performed an experiment with fry at two densities: 2 and 8 fish/L. The fry had a total length of , body weight , and pigmented patches (pigmented ratio ) on the blind side. Duplicate experiments were conducted in 93.7 L glass tanks for 120 days, from July to November. We determined daily food intake (DFI), food efficiency (FE), growth, survival rate, ratio of hypermelanic fish, and pigmented area rate on the blind side at 60-day intervals. The DFI was less than 50 mg/fish/day, and growth was delayed from July to September (water temperature [WT]> ). After October, when WT , the DFI increased significantly and the growth was accelerated, suggesting that the rearing temperature of starry flounder in artificial facilities should be . While the FE, and survival did no differ between the two density groups, DFI and growth were significantly higher at 2 fish/L than at 8 fish/L. There was no difference in the pigmented area ratio between the two density groups. Although the hypermelanosis was not correlated with body size, the malpigmentation increased with growth. These results suggest that a high stocking density is not the main cause of blind-side hypermelanosis, although it can accelerate hypermelanosis in the starry flounder.
-
quality characteristics of starry flounder Platichthys stellatus meat reared in different salinity
Journal of fisheries and marine sciences education, 2012Co-Authors: Han Kyu Lim, Min Hwan Jeong, Maenghyun Son, Young Soo Kim, Kyoungduck Kim, Youngjin ChangAbstract:This study was performed to evaluate the food value of starry flounder Platichthys stellatus reared in different salinity. Results of salinity experiment in starry flounder clearly showed that there were no significant difference among cohesiveness and hardness except springiness. Proximate composition of muscle, crude lipid at the salinity 0 psu was significantly higher than those 15 psu and 33 psu, but there was no significant difference in terms of crude protein, moisture and ash. While variations in some amino acid composition, serine and threonine contents were observed among fishes reared in different salinity of water, but no significant difference among the other amino acid contents. Muscle fatty acid composition showed significant difference among C16:0, C16:1n-7, C20:1n-9, C22:5n-3 and C24:0. Results of a sensory evaluation clearly indicated that there were no significant difference in odor and color of fish muscle reared in different salinity. But taste, texture and overall acceptability showed the lowest values in 0 psu.
-
physiological responses of starry flounder Platichthys stellatus during freshwater acclimation with different speeds in salinity change
Journal of Aquaculture, 2009Co-Authors: Young Soo Kim, Han Kyu Lim, Byunghwa Min, Bokkyu Lee, Youngjin ChangAbstract:Physiological responses (hematological factors, cortisol, glucose, osmolality, , and ) in starry flounder Platichthys stellatus were investigated during freshwater acclimation in the conditions of different speeds in salinity change with acute-decrease (AD) or stepwise-decrease (SD I and II). In AD of acute-decrease salinity, hematocrit (Ht), red blood cell (RBC) and hemoglobin (Hb) were rapidly increased more than SD I of stepwise-decrease salinity. But in case of SD II, Ht, RBC and Hb were no significant difference from beginning to end of this experiments. In AD, cortisol level significantly increased from at the beginning to at 6 hours and recovered to the basal levels () at 10 days. In SD I, cortisol level was significantly increased from at the beginning to at 6 hours and recovered to the basal levels () at 10 days. In SD II, cortisol level was a little increased from at the beginning to , at 6, 12 hours and recovered to the basal level at 48 hours. Glucose level of AD, SD I, II were no significant difference from beginning to end of this experiments. Osmolality was at the beginning. In SD II of stepwise-decrease, osmolality was no significant difference during rearing in freshwater (FW). But AD of stepwise-decrease and SD I of stepwise-decrease, osmolality was a little decreased end of this experiments. In AD of acute-decrease, only level was showed no significant difference from beginning to end of experiment and , levels were decreased. In case of SD I, level was showed no significant difference from beginning to end of experiment and , levels were decreased.
-
diel rhythm of oxygen consumption of the starry flounder Platichthys stellatus by water temperature
Korean Journal of Fisheries and Aquatic Sciences, 2008Co-Authors: Soongyu Byun, Sang Un Park, Min Hwan Jeong, Jongha Lee, Yicheong Kim, Beaik Lee, Youngjin ChangAbstract:Diel rhythm of oxygen consumption (OC) of the starry flounder Platichthys stellatus was measured at different water temperatures in a closed recirculating seawater system with a respiratory chamber. The fish consumed 70.5, 79.7, and 90.6 mg at 15, 20, and , respectively, showing a linear increase in OC with water temperature. The OC of fish showed a clear diel rhythm, with lower values during the day and higher values at night, in accordance with the light (09:00-21:00) and dark (21:00-09:00) phases of the diel cycle (12L:12D) in water at 15 and . However, the OC of the fish showed an unclear diel rhythm with the light and dark phases of the diel cycle at . The respective OC at 15, 20 and was 63.8, 72.4, and 88.4 mg during the light phases and 77.2, 87.1, and 92.8 mg during the dark phase. The starry flounder is thought to be a nocturnal fish with a higher OC at night, while it rests during the day. Its OC was the most stable in the light, when it did not feed. Consequently, the night-time OC is the active OC and the day-time OC is the resting OC in the starry flounder.
Christina Mork - One of the best experts on this subject based on the ideXlab platform.
-
Isolation and characterization of a rhabdovirus from starry flounder (Platichthys stellatus) collected from the northern portion of Puget Sound, Washington, USA.
Journal of General Virology, 2004Co-Authors: Christina Mork, Paul K. Hershberger, Richard M. Kocan, William N. Batts, James R. WintonAbstract:The initial characterization of a rhabdovirus isolated from a single, asymptomatic starry flounder (Platichthys stellatus) collected during a viral survey of marine fishes from the northern portion of Puget Sound, Washington, USA, is reported. Virions were bullet-shaped and approximately 100 nm long and 50 nm wide, contained a lipid envelope, remained stable for at least 14 days at temperatures ranging from −80 to 5 °C and grew optimally at 15 °C in cultures of epithelioma papulosum cyprini (EPC) cells. The cytopathic effect on EPC cell monolayers was characterized by raised foci containing rounded masses of cells. Pyknotic and dark-staining nuclei that also showed signs of karyorrhexis were observed following haematoxylin and eosin, May–Grunwald Giemsa and acridine orange staining. PAGE of the structural proteins and PCR assays using primers specific for other known fish rhabdoviruses, including Infectious hematopoietic necrosis virus, Viral hemorrhagic septicemia virus, Spring viremia of carp virus, and Hirame rhabdovirus, indicated that the new virus, tentatively termed starry flounder rhabdovirus (SFRV), was previously undescribed in marine fishes from this region. In addition, sequence analysis of 2678 nt of the amino portion of the viral polymerase gene indicated that SFRV was genetically distinct from other members of the family Rhabdoviridae for which sequence data are available. Detection of this virus during a limited viral survey of wild fishes emphasizes the void of knowledge regarding the diversity of viruses that naturally infect marine fish species in the North Pacific Ocean.
-
Isolation and characterization of a rhabdovirus from starry flounder (Platichthys stellatus) collected from the northern portion of Puget Sound, Washington, USA.
The Journal of general virology, 2004Co-Authors: Christina Mork, William N. Batts, Paul Hershberger, Richard Kocan, James WintonAbstract:The initial characterization of a rhabdovirus isolated from a single, asymptomatic starry flounder (Platichthys stellatus) collected during a viral survey of marine fishes from the northern portion of Puget Sound, Washington, USA, is reported. Virions were bullet-shaped and approximately 100 nm long and 50 nm wide, contained a lipid envelope, remained stable for at least 14 days at temperatures ranging from -80 to 5 degrees C and grew optimally at 15 degrees C in cultures of epithelioma papulosum cyprini (EPC) cells. The cytopathic effect on EPC cell monolayers was characterized by raised foci containing rounded masses of cells. Pyknotic and dark-staining nuclei that also showed signs of karyorrhexis were observed following haematoxylin and eosin, May-Grunwald Giemsa and acridine orange staining. PAGE of the structural proteins and PCR assays using primers specific for other known fish rhabdoviruses, including Infectious hematopoietic necrosis virus, Viral hemorrhagic septicemia virus, Spring viremia of carp virus, and Hirame rhabdovirus, indicated that the new virus, tentatively termed starry flounder rhabdovirus (SFRV), was previously undescribed in marine fishes from this region. In addition, sequence analysis of 2678 nt of the amino portion of the viral polymerase gene indicated that SFRV was genetically distinct from other members of the family Rhabdoviridae for which sequence data are available. Detection of this virus during a limited viral survey of wild fishes emphasizes the void of knowledge regarding the diversity of viruses that naturally infect marine fish species in the North Pacific Ocean.
Jeongin Myeong - One of the best experts on this subject based on the ideXlab platform.
-
Stress responses of starry flounder, Platichthys stellatus (Pallas) following water temperature rise.
Journal of environmental biology, 2015Co-Authors: Byunghwa Min, Mi Seon Park, Jeongin MyeongAbstract:Stress responses of starry flounder, Platichthys stellatus (Pallas) following water temperature rise were investigated to establish the influence of ambient temperature on this species. The physiological indicators of stress were plasma cortisol, glucose, aspartate aminotransferase, alanine aminotransferase, sodium, chloride, osmolality and triiodothyronine (T3). No significant difference in plasma parameters were observed among the experimental groups of 15 degrees C, 18 degrees C and 21 degrees C. Level of plasma cortisol (49.0-95.0 ng ml(-1)) and glucose (56.1-58.1 mg dl(-1)) of starry flounders kept at 24 degrees C-27 degrees C were significantly higher than those (cortisol: 20.4-23.6 ng ml(-1), glucose: 40.6-47.1 mg dl(-1)) observed in the 15 degrees C-21 degrees C groups. Changes in aspartate aminotransferase and alanine aminotransferase following water temperature rise showed a similar pattern to plasma cortisol and glucose. Starry flounders exposed to 27 degrees C exhibited higher plasma sodium (164.7 mmol l(-1)), chloride (147.6 mmol l(-1)), and osmolality (450.7 mOsm kg(-1)) than those (sodium: 154.0-158.7 mmol l(-1), chloride: 139.1-140.4 mmol l(-1), osmolality: 375.1-383.8 mOsm kg(-1)) fish exposed to 15-21 degrees C. Though plasma T3 (29.4 ng ml(-1)) of starry flounder increased at 24 degrees C, this hormone was significantly lower (19.3 ng ml(-1)) in fish kept at 27 degrees C than those (24.6 ng ml(-1)) the fish at 15 degrees C. This phenomenon seems to be directly associated with long-term fasting. Accordingly, the results suggested that starry flounders got stressed with osmoregulatory disturbances above 24 degrees C.
-
Genetic diversity and differentiation of the Korean starry flounder (Platichthys stellatus) between and within cultured stocks and wild populations inferred from microsatellite DNA analysis.
Molecular biology reports, 2014Co-Authors: Myung Mo Nam, Jeongin MyeongAbstract:The Korean starry flounder, Platichthys stellatus, is economically valuable coastal resident fish species. However, the annual catch of this fish has fluctuated and suffered major declines in Korea. We examined the genetic diversity and population structure for four wild populations and three hatchery stocks of Korean starry flounder to protect its genetic integrity using nine microsatellites. A group of 339 genotypes belonging to seven populations were screened. High degrees of polymorphism at the microsatellite loci were observed within both the wild and hatchery populations. Compared to the wild populations, genetic changes, including reduced genetic diversity and highly significant differentiation, have occurred in cultured stocks. Significant population differentiation was also observed in wild starry flounder populations. Similar degrees of inbreeding and significant Hardy–Weinberg equilibrium deviations were detected in both the wild and the hatchery populations. The genetic connectivity pattern identified four distinct metapopulations of starry flounder in Korea by clustering in the phylogenetic tree, Bayesian analyses, molecular variance analysis, PCA and multidimensional scaling analysis. A pattern of isolation-by-distance was not significant. This genetic differentiation may be the result of the co-effects of various factors, such as historic dispersal, local environment or anthropogenic activities. These results provide useful information for the genetic monitoring of P. stellatus hatchery stocks, for the genetic improvement of this species by selective breeding and for designing suitable management guidelines for the conservation of this species.
-
Morphological Analysis of Blind-Side Hypermelanosis of the Starry Flounder, Platichthys stellatus during Early Development.
Development & reproduction, 2014Co-Authors: Duk-young Kang, Soongyu Byun, Jeongin Myeong, Hyo-chan Kim, Byoung-hwa MinAbstract:In Pleuronectiformes, blind-side malpigmentation (hypermelanosis) is common in cultured flatfishes, and is economically important. To understand the mechanism of blind-side hypermelanosis in flatfishes, we examined when the malpigmentation initially occurred, and studied how the symptoms proceeded during early development of the starry flounder, Platichthys stellatus. To assess quantitative pattern changes of blind-side skin, we observed morphological development of the whole body from 22 (total length [TL] 10.0±0.2 mm and body weight [BW] 8.8±0.57 mg) to 110 days (TL 23.4±0.7 mm, BW 193.6±23.3 mg) after hatching (DAH), and also examined the malpigmented area rate of blind-side skin and the malpigmented fish ratios. The experimental animals were reared in fiberglass-reinforced plastic (FRP) tanks in water at a temperature of 18.9±1.9°C and salinity of 32.6±0.6 psu and were fed with rotifer and Artemia nauplii from 22 to 48 DAH, and with A. nauplii and commercial feed from 49 to 110 DAH. As results, the first staining patch seen by the naked eye was observed around the area between the anus and pelvic fin or caudal edge of the trunk at 80 DAH (TL 20.6±0.5 mm, BW 112.5±8.8 mg). The pigmented area and the pigmented fish ratios were significantly increased from 80 to 110 DAH. These results indicated that malpigmentation on the blind side of starry flounder was initially observed at about 2 cm in length and 100 mg in weight, and the pigmented domain on the blind-side skin was continually broadened by the differentiation of pigmented cells (melanophores and xanthophores) with growth.
-
the first report of a megalocytivirus infection in farmed starry flounder Platichthys stellatus in korea
Fisheries and Aquatic Sciences, 2013Co-Authors: Kyoungmi Won, Miyoung Cho, Myoung Ae Park, Bo Young Jee, Jeongin Myeong, Jinwoo KimAbstract:In 2009, a systemic megalocytivirus infection associated with high mortality was detected for the first time in cultured starry floun der Platichthys stellatus in Korea. Diseased starry flounder had pale bodies and gill coloring and enlarged spleens. Histopathologi cal examinations revealed basophilic enlarged cells in various organs of diseased starry flounder. Polymerase chain reaction (PCR) was performed on tissue samples using three published primer sets developed for the red sea bream iridovirus. PCR products were detected for all primer sets, except 1-F/1-R, which are registered by the World Organization for Animal Health (OIE). The part of the gene corresponding to the full open reading frame encoding the viral major capsid protein (MCP) was amplified by PCR. PCR products of approximately 1,581 bp were cloned, and the nucleotide sequences were analyzed phylogenetically. The MCP gene of the starry flounder iridovirus, designated SFIV0909, was identical to that of the turbot reddish body iridovirus (AB166788).
-
Wild and Hatchery Populations of Korean Starry Flounder (Platichthys stellatus) Compared Using Microsatellite DNA Markers
International journal of molecular sciences, 2011Co-Authors: Soongyu Byun, Yicheong Kim, Jang Wook Lee, Jeongin MyeongAbstract:Starry flounder (Platichthys stellatus) is an important sport and food fish found around the margins of the North Pacific. Aquaculture production of this species in Korea has increased because of its commercial value. Microsatellite DNA markers are a useful DNA-based tool for monitoring the genetic variation of starry flounder populations. In this study, 12 polymorphic microsatellite DNA markers were identified from a partial genomic starry flounder DNA library enriched in CA repeats, and used to compare allelic variation between wild and hatchery starry flounder populations in Korea. All loci were readily amplified and demonstrated high allelic diversity, with the number of alleles ranging from 6 to 18 in the wild population and from 2 to 12 in the farmed population. A total of 136 alleles were detected at the 12 microsatellite loci in the two populations. The mean observed and expected heterozygosities were 0.62 and 0.68, respectively, in the hatchery samples and 0.67 and 0.75, respectively, in the wild samples. These results indicate lower genetic variability in the hatchery population as compared to the wild population. Significant shifts in allelic frequencies were detected at eight loci, which resulted in a small but significant genetic differences between the wild and hatchery populations (FST = 0.043, P < 0.05). Further studies with additional starry flounder sample collections are needed for comprehensive determinations of the genetic varieties between the wild and hatchery populations. These microsatellite loci may be valuable for future population genetic studies, monitoring the genetic variation for successful aquaculture management and the preservation of aquatic biodiversity.
Ju-chan Kang - One of the best experts on this subject based on the ideXlab platform.
-
Effects of dietary ascorbic acid on growth performance, hematological parameters, antioxidant and non-specific immune responses in starry flounder, Platichthys stellatus
Aquaculture Reports, 2020Co-Authors: Hee-ju Park, Ju-chan KangAbstract:Abstract A 4-week feeding trial was conducted to assess the effect of AA on growth performance, hematological parameters, antioxidant and non-specific immune response in starry flounder, Platichthys stellatus (mean weight, 139.47 ± 1.41 g; mean length, 19.87 ± 0.21 cm). AA diets were designed as 0, 50, 100, 200, 400, 600 and 800 mg/kg, supplied as l -ascorbyl-2-monophosphate (AMP). The results of present study indicated that body weight gain (BWG), feed efficiency ratio (FER) and specific growth rate (SGR) were significantly higher than control group fed AA-free diet. In addition, AA diet increased red blood cell (RBC) count, hematocrit (Ht), hemoglobin (Hb), plasma calcium and magnesium, whereas total protein, glutamic oxaloacetic transaminase (GOT) and glutamic pyruvate transaminase (GPT) were significantly decreased. The superoxide dismutase activity (SOD), catalase activity (CAT), glutathione (GSH) and glutathione-S-transferase (GST) activity were significantly decreased compared with control group. Lysozyme and phagocytosis were significantly enhanced by increasing dose of AA supplementation. These results indicated that AA diet had a positive effect on growth performance, hematological parameter, antioxidant and non-specific immunity in starry flounder.
-
Change of growth performance, hematological parameters, and plasma component by hexavalent chromium exposure in starry flounder, Platichthys stellatus
Fisheries and Aquatic Sciences, 2019Co-Authors: Hee-ju Park, Ju-chan KangAbstract:The study investigated the changes in growth performance, hematological parameters, plasma components, and stress indicators of juvenile starry flounder, Platichthys stellatus, depending on varying exposure to hexavalent chromium. P. stellatus was exposed to waterborne chromium at 0, 50, 100, 200, and 400 ppb for 4 weeks. The result showed that Cr exposure resulted in decreased daily length gain (DLG), daily weight gain (DWG), condition factor (CF), and hepatosomatic index (HIS) in P. stellatus. In terms of hematological parameters, red blood cell (RBC) count, hematocrit (Ht), and hemoglobin (Hb) significantly decreased at 400 ppb after 2 weeks. In terms of plasma components, inorganic analysis was unchanged and cholesterol, an organic component, considerably increased at 400 ppb after 4 weeks. Plasma enzyme components including glutamic oxalate transaminase (GOT) and glutamic pyruvate transaminase (GPT) were significantly increased. Stress indicators such as cortisol and glucose were notably increased over 100 ppb after 4 weeks with increasing chromium concentration. The results indicate that exposure to waterborne Cr induced toxic effects on growth, hematological parameters, plasma components, and stress indicators.
-
Toxic effects of arsenic on growth, hematological parameters, and plasma components of starry flounder, Platichthys stellatus, at two water temperature conditions
Fisheries and Aquatic Sciences, 2019Co-Authors: Jae-min Han, Jun-hwan Kim, Dal-sang Jeong, Hee-ju Park, Ju-chan KangAbstract:The purpose of this study is to investigate the changes in growth, hematological parameters, and plasma components of juvenile starry flounder, Platichthys stellatus , following exposure to varying arsenic concentrations present at different water temperatures. P. stellatus (total length, 15.9 ± 0.4 cm; body weight, 62.2 ± 4.2 g) were exposed for 4 weeks to waterborne arsenic (sodium arsenite, As) at 0, 150, 300, and 600 μg/L at temperatures of 12 °C and 18 °C. Toxic effects of As exposure on P. stellatus were higher at the higher temperature and the growth and hematological parameters measured decreased with increasing arsenic concentration, while the concentration of plasma components measured increased. This indicates that waterborne As exposure and water temperature can cause toxic effects on growth, hematological parameters, and plasma components in Platichthys stellatus .
-
Toxic effects and depuration after the dietary lead(II) exposure on the bioaccumulation and hematological parameters in starry flounder (Platichthys stellatus).
Environmental toxicology and pharmacology, 2016Co-Authors: In-ki Hwang, Jun-hwan Kim, Kyeong-wook Kim, Ju-chan KangAbstract:Abstract Platichthys stellatus (mean length 20 ± 2 cm, mean weight 160.15 ± 15 g) were exposed to the different levels of dietary lead(II) at the concentrations of 0, 30, 60, 120, 240 mg/kg for 4 weeks. Depuration was conducted for 2 weeks after exposure. The lead exposure over 60 mg Pb/kg induced the significant bioaccumulation in tissues of P. stellatus (5–30 μg/g tissue), except for brain and muscle where the exposure to 240 mg Pb/kg caused the bioaccumulation (2–4 μg/g tissue). The hematological parameters such as red blood cell (RBC) counts, hematocrit (Ht) value and hemoglobin (Hb) concentration were substantially decreased over 60 mg Pb/kg, and lasted even after the depuration period. For plasma components, calcium and magnesium levels in plasma were generally decreased over 60 mg Pb/kg, and glucose level was also mainly increased over 60 mg Pb/kg. Total protein was significantly decreased over 120 mg Pb/kg after 4 weeks exposure. Glucose and total protein showed the restoration after the depuration period in groups of fish exposed previously to over 60 and 120 mg Pb/kg, respectively. However, other parameters that changed during the exposure over 60 mg Pb/kg did not recovered. For enzymatic components in plasma, glutamic oxalate transminase (GOT), glutamic pyruvate transminase (GPT) and alkaline phosphatase (ALP) were significantly increased over 120 mg Pb/kg, and there was only restoration observed after the depuration for ALP over 120 mg Pb/kg.
