Qtae Jo - Academia.edu (original) (raw)

Papers by Qtae Jo

춘계학술연구회발표논문집, 2008

... 발행정보, 춘계학술연구회발표논문집 , 2008 권 , 단일호 , Startpage 299 , Endpage 301 , Totalpage 3. - 저자, ( S. Siv... more ... 발행정보, 춘계학술연구회발표논문집 , 2008 권 , 단일호 , Startpage 299 , Endpage 301 , Totalpage 3. - 저자, ( S. Sivakumar ) , ( Young Chae Song ) , ( Sung Chung Ko ) , ( Eung Ju Hwang ) , ( Qtae Jo ) , ( Dong Keun Kim ). - 가격, 1,000 원. - 발행년도, 2008. ...

Ocean and Polar Research, Sep 1, 2001

The strength of juvenile black rockfish, Sebastes schlegeli, raised in different hatcheries for w... more The strength of juvenile black rockfish, Sebastes schlegeli, raised in different hatcheries for wild stock enhancement was evaluated in terms of resistance to an anesthetizing agent, tricaine methane-sulfonate (MS-222), and exposure to drying. The working dosage of MS-222 varied significantly with fish size and hatchery population. Smaller fish were less resistant to the chemical than larger ones. MS-222 effects also differed with fish growth history. The fish cultured in embanked populations showed stronger resistance, earlier recovery, and lower mortality, compared to those cultured in land-based tanks or collected from wild stocks. Similar results were seen in juveniles challenged to dry exposure. These results suggest that an embanked population of black rockfish is more resistant to anesthetic stress, expressed as anesthesia recovery and mortality, and that this population is healthier than others.

Aquaculture Research, Nov 1, 2003

Erythrocytes of olive £ounder, Paralichthys olivaceus (Temminck et Schlegel), were treated with s... more Erythrocytes of olive £ounder, Paralichthys olivaceus (Temminck et Schlegel), were treated with serial concentrations of formalin (37% formaldehyde) to investigate in vitro haemolysis and methaemoglobin formation. In addition, the short-term toxicity of formalin concentrations of 0,100, 212 and 300 ppm was also studied by clinical tests in which ¢sh were subjected to 3-h bath exposure. There was no haemolysis of ¢sh erythrocytes exposed to formalin concentrations ranging from 31.3 to 2000 ppm. Methaemoglobin formation, however, was induced at concentrations greater than 500 ppm. Red blood cell count, haemoglobin, haematocrit, mean corpuscular haemoglobin concentration and percentage of immature erythrocytes were also markedly elevated in all formalin-exposed groups (Po0.05). Formalin exposure also caused signi¢cant increases in alkaline phosphatase, aspartate aminotransferase, lactate dehydrogenase, potassium, chloride, magnesium and inorganic phosphorus (Po0.05). However, total protein decreased signi¢cantly in the formalin-exposed groups (Po0.05). No signi¢cant di¡erences in white blood cell count, mean corpuscular volume, mean corpuscular haemoglobin, albumin, glucose, total cholesterol, high-density lipoprotein cholesterol, free cholesterol, alanine aminotransferase, calcium, creatinine and total bilirubin were observed in the formalinexposed groups (P40.05).

Journal of Aquaculture, 2005

We previously pointed out that the polluted sediment elutriate manifestly affected the early even... more We previously pointed out that the polluted sediment elutriate manifestly affected the early events of reproductive outputs in the Pacific oysters, Crassostrea gigas. A serial dilution of priority xenobiotic sediment elutriates determined by gas chromatography/mass spectrometry (GC/MS) were exposed to gametes of the oyster with different stress burdens to detail the maternal stress transfer to its reproductive outputs. There was an apparent critical concentration over which survival and morphogenesis were significantly affected with more profound damage in morphogenesis. The critical concentration which drives mortality and abnormal morphogenesis of the larvae corresponded to a dilution between 10 and 20% of our elutriate. The adverse effects of the early lives by the xenobiotic exposure over the critical concentration were magnified by the maternal stress from the exposed benzo(a)pyrene (BaP), one of the priority polyaromatic hydrocarbons (PAHs) during the maturation condition. These results indicate that maternal transfer of the xenobiotic compounds from oysters living in the contaminated location might represent a significant adverse effect to their larval population of wild seeds.

한국패류학회지, Sep 30, 2011

We examined the effect of an artificial change of water temperature on the survival rate of Korea... more We examined the effect of an artificial change of water temperature on the survival rate of Korean Scallop, Patinopecten yessoensis. As for the change of water temperature, the aspects appearing on the eastern coast of Korea during spring and summer were artificially prepared in the rearing aquarium in the laboratory. The survival rate of Scallop, due to the stimulus of a low water temperature in spring, was an average of 51.6%. Medium-sized scallops averaged 4.4%, which is lower than that of small-sized ones (85.82%) and large-sized ones (55.0%). The survival rate of Scallop, due to the stimulus of water at a high temperature in summer, was an average of 43.3%. As for small-sized scallops, they averaged a 46.7% survival rate which is lower than that of medium-sized scallops (60.0%). In general, the survival rate was lower in summer than in spring. Such results show that the death of Scallop, has close relevance to the change of water temperature. The low survival rate of medium-sized ones. Alternatively, medium-sized scallops have to get through winter, even if they cannot grow enough compared with large-sized ones. This is because large-sized scallops have already been adapted to the change of water temperature by getting through winter twice.

Korean Journal of Fisheries and Aquatic Sciences, Jun 30, 2008

Korean Journal of Fisheries and Aquatic Sciences, Feb 28, 2009

The Japanese scallop (Patinopecten yessoensis), a cold-tolerant bivalve, is one of the key specie... more The Japanese scallop (Patinopecten yessoensis), a cold-tolerant bivalve, is one of the key species cultured in suspension on the Gangwon coast of the East Sea (Sea of Japan). However, since the commencement of the scallop farming in early 1990s mass mortalities occurred most probably due to daily temperature variation during summer. The East Sea Fisheries Research Institute (ESFRI) monitored the scallop mortalities for years, finding that hatchery-based seeds are more resistant against the daily temperature variation than wild seeds. Noticeable difference of hatchery-based seeds from wild ones are maternal selection and higher temperature to which their larval lives are exposed. ESFRI established a method producing the scallop seeds in mass at elevated temperature 182higher than previous temperature and found it more effective for survival in the nursery and thereafter on-going growth. We extended the hatchery water temperature up to 21to produce about 300 millions of just settled P. yessoensis larvae and compared with those produced at moderate temperatures (14, 16, and 18in terms of both survival and growth performance in the hatchery and in the ensuing nursery ground. The hatchery larval survival at 21was competitive with or even higher than that at 18However, a great mass mortality occurred for the larvae of 21during temperature acclimation to wild temperature, an intermediate step prior to translocaton to nursery ground. The mortality lasted 15 days post settlement, resulting in a total of around 90% mortality, which was greater than that of other temperatures. The spat survivals, thereafter, were stable until second mortality happened during another translocation process to mesh size-bigger lantern cages (Figure 1). Larval and spat growths were also serially measured to compare along with their survivals.

Korean Journal of Environmental Biology, Sep 30, 2008

Total feeding rates and digestion effectiveness of the Siberian sturgeon were determined for a li... more Total feeding rates and digestion effectiveness of the Siberian sturgeon were determined for a limited one-hour feeding and for continuous feeding. The mean fork length was 13.7 1.7 (S.D) and mean weight was 12.0 3.2 (S.D) g for the individuals used in these experiments. Continuous feeding induced subsequent weight increase of the stomachs but the weight of digestive tracks were relatively constant (Fig. 1). The maximal weight ratio was recorded 8 hours after feeding in the continuous feeding group and 1-2 hours after feeding in the group fed only for an hour. Trypsin activities in digestive tracks showed different peak values depending on the feeding method (Fig. 2). Limited feeding induced more trypsin activity in total digestive track. The highest trypsin activity showed 4 hours post feeding in both feeding groups. However, the level of activity in limited feeding, either mg unit digestive track or total dried weight of digestive track, was higher in the continuous feeding group.

The Malacological Society Of Korea, Jun 1, 2018

Farmed red sea breams, Pagrus major, were fed for 60 days with pellets containing different conce... more Farmed red sea breams, Pagrus major, were fed for 60 days with pellets containing different concentrations of benzo(a)pyrene (0, 0.2, 2, 20 mg/kg) to generate a biomarker of the chemical toxicity in the fish. The fish exposed to the chemical concentrations did not show any significant difference in the weight gain, conditioning, factor, and hepatosomatic index. However, some haematological parameters, such as glucose, calcium, magnesium, GOT (glutamic oxalate transaminase), and GPT (glutamic pyruvate transaminase) were influenced by the chemical exposure. Of them, two enzymes, GOT and GPT, increased significantly 60 days after the exposure in a way of concentration dependence (P

Stable carbon and nitrogen isotopes were analyzed in suspended particulate organic matter, macroa... more Stable carbon and nitrogen isotopes were analyzed in suspended particulate organic matter, macroalgae and macrobenthic invertebrates in order to determine the importance of primary organic matter sources in supporting food webs of rocky subtidal and intertidal macroalgal beds in the Korean coasts. Investigations were conducted at the inter tidal sites within Gwangyang bay, a semi-enclosed and eutrophicated bay, and the subtidal sites of the east coast, a relatively oligotrophic and open environment, in May and June 2005. Water-column suspension feeders showed more negative values than those of the other feeding guilds, indicating trophic linkage with phytoplankton and thereby association with pelagic food chains. In contrast, animals of the other feeding guilds, including interface suspension feeders, herbivores, deposit feeders, omnivores and predators, displayed relatively less negative values than those of the water-column suspension feeders and similar with that of macroalgae, i...