• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.55 no.3
• /
• pp.217-232
• /
• 2019

It was turned out by shrimp beam trawl monthly survey from March, 2015 to February, 2016 that different species composition and abundance of the fish assemblages in Sacheon Bay and coastal waters off Namhae, Korea were compared. As a result of monthly measured sea temperature and salinity of Sacheon Bay and coastal waters off Namhae, sea temperature of both areas was changed seasonally; however, differences in sea temperature occurred during certain periods depending on the region. Salinity was generally low in Sacheon Bay affected by fresh water, and both areas was low in summer and high in winter. A total of 73 species representing 37 families were collected in Sacheon Bay. The dominant fish species in terms of numbers and biomass were Liparis tanakae, $23,077inds./km^2$, $332.1kg/km^2$. A total of 91 fish species representing 49 families were collected in coastal waters off Namhae. The dominant fish species in terms of numbers were Leiognathus nuchalis, $139,683inds./km^2$ and biomass were Chelidonichthys spinosus, $1,078.6kg/km^2$. Analysis of dendrogram of the clustering showed that Sacheon Bay and coastal waters off Namhae were distinctive featured (global R = 0.691, p = 0.017). And except of summer season (July-October), there was a distinctive feature seasonally (global R = 0.844, p = 0.001). The fish species that appeared in common in both areas, where fish species caught in Sacheon Bay, an important inner bay,were smaller than those caught in coastal waters off Namhae appeared. It presented that Sacheon Bay plays a more important role in spawning and nursery ground for fisheries resource than coastal waters off Namhae, Korea.

• Journal of Bio-Environment Control
• /
• v.29 no.3
• /
• pp.293-305
• /
• 2020

This experiment was aimed to identify concentrations of mineral nutrients in leaf lettuce (Lactuca sativa) grown on hydroball aquaponics and in the water for growing fish by conducting two experiments. The experiment I (Expt. I) was conducted with 12 fishes (F12) with and without filter, hydroball and plants (H12 (12 fishes, hydroball), FHP12 (12 fishes, filter, hydroball, 6 plants) and HP12 (12 fishes, hydroball, 6 plants)), and the experiment II (Expt. II) was with and without plants (FH15 (15 fishes, filter, hydroball), FHP15 (15 fishes, filter, hydroball, 6 plants)). The pH level in the water of all the treatments was decreased during the growing period, and the pH and EC of the water were lower in all the treatment with plants than those without plants in both Expt. I and Expt. II. When compared with adequate nutrient concentrations for hydroponics, nitrate nitrogen (NO₃-N) and phosphorus (P) concentrations in the fish growing water were higher under the FHP15 treatment in Expt. II; however, potassium (K), calcium (Ca), and magnesium (Mg) were only 16, 49, and 82% of hydroponics, representatively, and iron (Fe) was not detected. The fresh weight of lettuce harvested from the FHP15 treatment was 38 g, only a 30% of marketable lettuce yield. The T-N and P contents of the leaf tissue grown under the FHP15 treatment were close to the optimal level; however, the K, Ca, and iron (Fe) contents were less than the optimal with no deficiency symptom.

• Journal of agricultural medicine and community health
• /
• v.5 no.1
• /
• pp.46-48
• /
• 1980

A case of sparganosis was presented. Sparganosis is not infrequent tissue helminthiasis in Korea and the incidence has been evidently increased. The patient was a 50-year-old Korean male who had a habit of eating raw flesh of fresh water fish. He first noticed the appearance of two peanut-sized masses in the right subcostal region, however, the two masses enlarged gradually to a pigeon egg size during 5 years. On surgical exploration, one larva (61 cm in length and 4 to 6 mm in width) from two masses was extracted. It was moved actively in warm physiological saline solution.

• The Korean Journal of Zoology
• /
• v.17 no.3
• /
• pp.127-130
• /
• 1974

The lactate dehydrogenase isozymes in tissues of eight fresh water fishes were examined by cellulose acetate electrophoresis. The electrophoretic distribution of the isozymes showed clearly species-specific pattern. Various subbands were found more frequently in these fishes than in mammals. The isozyme pattern of muscle seems to tend to be the same with that of brain in these fishes. The fish lactic dehydrogenase suggested in many cases to be consisted of nonrandomly selected hybrids.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.46 no.5
• /
• pp.559-564
• /
• 2013

This study was performed to determine effects of dietary inclusion of various concentrations and sources of sea tangle Laminaria japonica on growth, body composition and plasma chemistry of juvenile black porgy Acanthopagrus schlegeli. Juvenile fish (N=810; average mass=8.9 g) were distributed among twenty-seven 200 L flow-through tanks (30 fish per tank). Nine experimental diets were prepared: control (Con) without additives; sea tangle powder at 0.1%, 0.5%, 1%, 2%, 3% and 5%, (P-0.1, P-0.5, P-1, P-3 and P-5 diets, respectively); and fresh sea tangle (F-1); and 1% sea tangle extract (E-1). Each powdered additive was substituted for an eqaul amount of wheat flour, and the extract was substituted for an equal amount of water in the respective experiemtnal diets. Each diet was fed to triplicate groups of fish. Weight gain and feed conversion ratio were not affected by the experimental diets. Feed consumption by fish fed the P-1 diet was higher than that of fish fed the P-3 and P-5 diets. Moisture, crude protein, crude lipid, whole-body ash content (excluding the liver), liver moisture, and crude protein and lipid contents of fish were not affected by the experimental diets. None of the fish plasma criteria were affected by the experimental diets, with the exception of plasma glucose. In conclusion, dietary inclusion of various concentrations and sources of sea tangle did not significantly affect the growth, feed efficiency, body composition or plasma chemistry of juvenile black porgy.

• Journal of fish pathology
• /
• v.30 no.2
• /
• pp.115-134
• /
• 2017

A total number of 668 apparently healthy fish were obtained from farm to study the effect of two heavy metals (Copper and Mercury) on histopathology of liver, kidney, spleen, gills and muscles also residues in muscles. The $LC_{50}$/96 hr. of Cu and Hg were estimated and fish exposed to 1/2 $LC_{50}$ for 7 days and for 1/10 $LC_{50}$ for 8 weeks from each product separately. Histopathological findings in acute and chronic mercuric chloride toxicity revealed degeneration and necrosis in the glomeruli, interstitium tissue and epithelium lining renal tubules. The tubular epithelium became necrotic at several places. Eosinophilic hyaline droplets is exist in the cytoplasm of the necrosed cells. Degenerative changes and hyperactivity in melanomachrophage center was seen in the spleen together with some necrotic areas. Necrosis and aggregation of melanomachrophage were seen in the hepatic cells, Hepatic cells showed vacuolar degeneration in the hepatic cells. Gills showed loss in the lamellae of the filaments associated with edema, inflammatory cells infiltration and haemorrhages in the arch. The sarcoplasm of the bundles of the skeletal muscle showed granular degeneration and focal inflammatory cells infiltration between the hyalinized bundles. Mercury residues obtained from these studies in the acute toxicity were 0.22 ppm/gm in the 2nd day, 0.411 ppm/gm in the $5^{th}$ day ended with 0.96 ppm/gm in the $7^{th}$ day. In chronic toxicity it was 1.1320, 1.7140, 2.3620 and 3.5640 ppm/gm respectively from the $2^{nd}$ to the $8^{th}$ week of exposure. In acute and chronic copper toxicity, there was degenerative changes in renal tubules. Melanophores aggregation in the wall of the blood vessels of the spleen and depletion of some of the melanophores in the melanomachrophage were seen together with necrosis in some areas. Congested Mvs (Micro vessels) and vacuolation of hepatocytes were observed. Some areas of hemorrhage and melanophores vacuolar degeneration in the liver were seen. There was mitosis in some areas with displesia of hepatopancreatic cells and eosinophilic granular cells aggregation. Zymogen granules disappeared and there were dyplastic hepatocytes. Congestion in the blood vessels of the gill filaments, associated with massive number of granular eosinophilic cells infiltration were seen in the base of the filaments. There were sever vacuolization and hyalinization in the skeletal muscle bundles. Detection of residues of copper sulfate revealed increase of the amount of copper measured in ppm/gm comparing to the normal control starting from 0.60 ppm/g in the $2^{nd}$ day, 0.67 ppm/g in the $5^{th}$ day and 0.67 ppm/g in the $7^{th}$ day. Result obtained in chronic copper sulfate toxicity revealed gradual increase of the amount of copper which ranged from 0.18 ppm/g at the $2^{nd}$ week to 0.21 ppm/g in the $8^{th}$ week of exposure.

• Parasites, Hosts and Diseases
• /
• v.27 no.1
• /
• pp.41-46
• /
• 1989

This study was performed to observe the infection rate and infection intensity of fresh water fish such as pale chub (Z. platypus) and dark chub (Z. temminckii) with the metacercariae of C. armatus. The fish were caught in several rivers and streams from June to September, 1988 and examined by artificial digestion technique. Total 370 fish were caught at 19 rivers. The metacercarial (C. armatus) infection rate and average burden in Z. Platypus were 86.8% and 224, and those in Z. tsmminckii were 78.5% and 131. The infection rate and burden per fish were 73.4% and 32 in the fish caught from the Han river, and 88.0% and 44 from the Youngsan river. All fish caught from the Keum and the Tamjin river were infected and their mean metacercarial density was 45 and 59 respectively. The infection rate and density in fish caught from the Seomjin and Nagdong rivers were 100% and 119, and 81.0% and 348 respectively. From this study, it is confirmed that C. armatus is widely distributed along 5 major rivers in Korea.

• Economic and Environmental Geology
• /
• v.38 no.2 s.171
• /
• pp.129-134
• /
• 2005

The $^{87}Sr/^{86}Sr$ ratios between water and biogenic material are similar in marine and lacustrine environment. Pb isotope ratios we, however, reported not to have been corresponding between the biological tissues and ambient water in aquatic system, contrary to the Sr isotope ratios. In order to explore the potential application of two isotopes as environmental tracers, we report here the isotopic compositions of strontium and lead of gastropod shell in fresh water in Jinan area. The $^{87}Sr/^{86}Sr$ ratios of carbonate shells of gastropod living in fresh stream water, are similar as that of ambient water but are different by sites. The different $^{87}Sr/^{86}Sr$ ratios of stream water between the sites is likely caused by the difference of the isotopic composition of Sr derived form rocks in the basin. In contrast, there is a distinct difference of the lead isotopic values between the water and the gastropod shell, suggesting that shell-fish available lead in aquatic system is different from dissolved lead in water. It is assumed that the majority of Pb in stream water is derived from atmospheric Pb accumulated on soil materials over years rather than from rock.

• Applied Biological Chemistry
• /
• v.36 no.1
• /
• pp.64-69
• /
• 1993

This study was performed to investigate detoxifying enzyme activities of carboxylesterase(CE), glutathione S-transferase(GST) and lactate dehydrogenase(LDH) at variable toxicity levels in fresh water fish, carp(Cyprinus carpio L.). The carp was exposed to single and combined pesticides of IBP, isoprothiolane and cartap for 48 hr at sublethal doses, $LC_{10}$ and $LC_{26}$. The detoxifying enzyme activities were assayed for the liver, head and gut of the carp. The enzyme activities we discovered were as follows: Both activities of CE and GST were increased at the sublethal doses but were declined by increasing doses. In the gut, we found that the CE activity had high levels in the treatment groups of isoprothiolane+IBP and isoprothiolane+cartap. In the head, the CE activity had high levels in the treatment groups of cartap, IBP and isoprothiolane. However, the GST activities were inconsistent in the head and gut of the fish. Also, the GST activity was declined by increasing protein contents. The highest LDH activity was shown in the isoprothiolane treated fish, while the lowest activity was observed in the isoprothiolane+cartap treatment.

• Journal of the Korean Society of Food Culture
• /
• v.27 no.2
• /
• pp.142-156
• /
• 2012

This study examined the food culture of Koreans aged over 80-years-old living in the areas of Goorye and Gokseong. The research method was based on examination of individual cases through in-depth interviews. The total number of survey subjects was 38; males constituted 34 percent of the subjects while females constituted 66 percent of the subjects. Average age of male subjects was 85.3 years while average age of females was 84.8 years. The results were summarized in the following properties of the typical and traditional Korean table, which was the most common food life's property in the longevity area of was centered around rice, watery soup, vegetables, and fish. The first, as the supply step's property of food ingredients, various spices and ingredients such as piperitum, tumeric, ginger, garlic, chili pepper, and salted fish were used. Senior persons also supplied fresh vegetables at the kitchen garden, and they led a nature-friendly food life. The second, as the production of food and cooking of food step's property, there were multigrain rice and fermented foods such as soybean paste, kimchi, red pepper paste, salted fish, vegetables picked in soy sauce, etc. The recipe was cookery intermediated with water, soup, steamed vegetables, seasonings, etc., and it was characterized by a deep and rich taste due to the various spices and rich ingredients. The third, as the consumption of food step's property, senior persons regularly ate a balanced diet three times a day. They also had active personal relationships with their neighbors by sharing food, which increased their sense of belonging and improved their life satisfaction.