• 한국환경생태학회지
• /
• 제12권1호
• /
• pp.42-57
• /
• 1998

제주도 척추동물상에 관한 문헌을 정리한 결과 제주도산 담수어류는 9목 12과 24종, 양서류는 2목 6과 9종, 파충류는 2아목 5과 10종, 조류는 18목 49과 4아과 236종, 포유류는 6목 9과 16종으로 총 35목 2아목 80과 4아과 295종이 분포, 서식하고 있음이 확인되었다. 제즈도의 특산 척추동물은 제주족제비(Mustela sibirica quelpartis), 제주등줄쥐(Apodemus agrarius chejuensis), 제주멧밭쥐(Micromys minutus hertigi) 및 제주땃쥐(Crocidura russula quelpartis)등 4종의 포유류가 있고, 조류는 제주오목눈이(Ageithalos caudatus trivirgatus), 제주동고비(Sitta europaea bedfordi), 제주밀화부리(Eophona personata personfumigatus), 제주박새(Parus major minor) 및 제주휘파람새(Cettia diphone antans) 등 7종이며, 양서류는 유미류의 제주도롱뇽(Hynobius leechii quelpartis) 1종 등, 총 12아종이 서식하고 있으며, 한편 본토에는 서식하지 않고 제주도에만 서식하는 종은 비바리뱀(Sibynophis collaris)과 무태장어(Anguilla mauritiana)이다. 제주도는 신생대 3기말에서부터 4기에 걸쳐 형성되었으며, 지질학적으로 빙하기가 시작되는 Donau 빙하기 이후부터 척추동물이 이주하여서식하기 시작하였고, 제주도가 형성된 후 척추동물이 생존하기에 적합ㅎ한 환경이 조성되면서 중기 홍적세 이후 현세로부터 약 30만년전부터 빙하기와 간빙기의 반복과 더불어 본토집단과 지리적 격리가 거듭되면서 척추동물의 종분화가 진행되고 있다.

• 한국수산과학회지
• /
• 제38권1호
• /
• pp.39-54
• /
• 2005

Seasonal variation in species composition of fish in the Geum River estuary was determined using monthly samples collected with a bag net from February to December 2003. Of a total of seventy-three species collected, four groups of fishes were distinguished. Estuarine fishes such as Chelon haematocheilus and Synechogobius hasta were collected almost all the seasons and predominated in abundance during cold months. Coastal fish species such as Sardinella zunasi, Konosirus punctatus, Engraulis japonicus, Johnius grypotus and Thryssa kammalensis were dominated from late spring to autumn. Their adults entered into the estuary in spring and a large number of their juveniles were collected in summer and autumn till moving out to deeper waters for over-wintering. A few freshwater fishes were collected when the freshwater was discharged during the rainy season. Anguilla japonica elvers (diadromous fish) and Coilia nasus (amphidromous fish) were collected in spring during their upstream migration. The principal component analysis revealed that the seasonal variation in species composition of fishes was principally determined by water temperature and/or water temperature related factors.

• 대한수의학회지
• /
• 제34권3호
• /
• pp.627-633
• /
• 1994

A study on efficacy and safety of Bio-Gammamix was performed to use for the preventive drug against bacterial diseases to mirror carp(Cyprinus carpio), rainbow trout(Salmo gairdneri), eel(Anguilla japonica) and flounder(Paralichthys olivaceus). The main ingredients of Bio-Gammamix were ferrous fumarate and mixed extrated powders of licorice root, ox bile and garlic. The test drug was proved to improve feeding habit and feed efficiency and decrease cumulative mortality remarkably. After administration, no side effects and histopathological changes were observed. We can prevent outbreaks of bacterial diseases of fish by the dosage of 1kg/ton of fish body weight perorally once or two times in a day for 7 days and Bio-Gammamix is thought to be used effectively an widely against most bacterial fish pathogens.

• 대한수의학회지
• /
• 제37권1호
• /
• pp.203-212
• /
• 1997

Antibacterial efficacy and safety of copper sulfate pentahydrate (5% solution) was evaluated in laboratory and field studies for disinfection of some fish bacterial pathogens in cultured fish, flounder(Paralichthys olivaceus), mirror carp(Cyprinus carpio), gold fish(Carrassius auratus) and eel(Anguilla japonica). Dipping of fishes for acute toxicity was performed for a period of 48h, and the TLm value(median tolerance limit) were 4.0ppm in mirror carp and flounder, 4.4ppm in rainbow trout, and 10.0ppm in gold fish. After exposure below than TLm value for 1 month, no side effects and histopathological changes were observed. The test drug were shown high antibacterial activities against most bacterial pathogens by exposure in the laboratory and field trials. However, Aeromonas salmonicida showed a resistance to the dosage. We can prevent outbreaks of bacterial diseases of fish by the dosage of 1ppm for 6hr and the test drug is thought to be used effectively and widely as a disinfectant against most bacterial fish pathogens.

• 한국식품위생안전성학회지
• /
• 제7권2호
• /
• pp.99-106
• /
• 1992

To prevent food-poisoning outbreaks by Vibrio vulnificus the antimicrobial efficacy of grapefruit seed extract (GFSE) was examined. Minimal inhibitory concentration (in vitro) for the microorganism was found to be 50∼100 ppm. Transmission electron micrographs of Vibrio vulnificus showed the biocidal action of this natural antimicrobial agent would be related to specific respiratory effect coupled with the destruction of permeable function of microbial cell membrane. After Anguilla japonica GFSE-injected to the body was incubated in the seawater contaminated by Vibrio vulnifiucs the fish meats were taken up, mixed with control diet and used as a diet in the feeding experiment. In this experiment the effect of GFSE treated with fish muscle on body weight, protein efficiency ratio, serum enzymes and serum blood components of broiler chicks was investigated. It is proved from this study that there is neither Vibriosis nor toxicity associated with GFSE itself an fish meats treated with it when it is injected to the fish body at a level of 250 ppm or less.

• 한국동물생명공학회지
• /
• 제36권4호
• /
• pp.169-174
• /
• 2021

Mutations in the luteinizing hormone/chorionic gonadotropin receptors (LH/CGRs), representatives of the G protein-coupled receptor family, have been rapidly identified over the last 20 years. This review aims to compare and analyze the data reported the activating and inactivating mutations of the LH/CGRs between human, rat, equine and fish, specifically (Japanese eel Anguilla japonica). Insights obtained through detailed study of these naturally-occurring mutations provide a further update of structure-function relationship of these receptors. Specifically, we present a variety of data on eel LH/CGR. These results provide important information about LH/CGR function in fish and the regulation of mutations of the highly conserved amino acids in glycoprotein hormone receptors.

• Journal of Microbiology and Biotechnology
• /
• 제27권4호
• /
• pp.725-730
• /
• 2017

A heteronemertean, Yininemertes pratensis, was collected in Han River Estuary, South Korea. This estuarine nemertean has been known by the local fishermen for harmful effects to the glass eels, juveniles of Japanese eel Anguilla japonica, migrating to fresh water. The present study confirmed the neurotoxic effects of this heteronemertean ribbon worm at the cellular level. Derivative types of neurotoxic tetrodotoxin (TTX), 5,11-dideoxy TTX (m/z 288) and 11-norTTX-6(S)-01 (m/z 305.97), were identified through HPLC and MALDI-TOF MS. However, significant neurotoxicity was confirmed in the fraction containing an undefined molecule corresponding to the 291.1 (m/z) peak, when tested in rat primary astrocytes and dorsal ganglion cells. This study is the first to report neurotoxins of the estuarine nemertean, fairly abundant in the Han River estuary, and suggests the long-term monitoring of population dynamics and surveillance of the toxicity in this river estuary.

• 한국가축번식학회지
• /
• 제20권3호
• /
• pp.259-269
• /
• 1996

To establish whether or not androgens is responsible for the induction of vitellogenin(Vg) synthesis and secretion, primary hepatocytes prepared from immature eels were used. The results are follows: 1. Eel hepatocytes were prepared using a collagenase perfusion technique. The isolated cells attached efficiently to fibronectin-coated dishes and subsequently formed monolayers in serum-free medium. These cultures maintained in medium for 10 days with minimal cell loss. 2. Estradiol-17$\beta$(E2) alone was insufficient to induce Vg synthesis. The combination of E2 with methyltestosterone(MT) markedly stimulated Vg synthesis. High vg production occurred in MT concentration from 10-6~10-5M in the presence of E2 (10-6M). Testosterone and androsterone were also effective, but progesterone was not effective in inducing Vg synthesis. Neither MT alone nor testosterone and androsterone alone had any effect on Vg synthesis. 3. E2-primed hepatocytes showed Vg synthesis in both media with and without hormones 1 day after culture. In the cultures with the vehicle, MT, or progesterone, the rate of synthesis seemed to decrease with time. But the combination of E2 and MT showed an intense increase in Vg synthesis. Hepatocytes isolated from E2-primed eels also required androgens for continuating of Vg synthesis. 4. These results demonstrate that androgens act together with E2 in synthesis and secretion of eel Vg.

• 수산해양교육연구
• /
• 제26권6호
• /
• pp.1209-1216
• /
• 2014

This feeding experiment was conducted to investigate the effects of slurry type diet on growth performance and survival rate of growing leptocephalus, eel larva. We need to find new materials of diets for rearing eel larvae. Test diets were formulated with the eggs of the shark, fish soluble concentrate, soybean peptide and fish protein hydrolysate. Fish (average length 6 mm) were fed 3 slurry type diet(A, B and C) based on shark egg for 5 times per day. During feeding experiment, survival rates were significantly different among 3 slurry type diets. Total protein, lipid, moisture, ash and free amino acids contents were analyzed for slurry type diets. Leptocephalus fed the C slurry type diet was grown up to $38.0{\pm}9mm$ at 150 days. But all leptocephalus fed B slurry type diet were died at 100 days, reaching $16.4{\pm}8mm$. This results suggest that basic information for diet development of eel leptocephalus.

• 수산해양교육연구
• /
• 제18권3호
• /
• pp.374-378
• /
• 2006

Eel is Anguilla japonica and Anguillidae family as a freshwater fish, and Japanese name is Unagi. The content of vitamin A of eel muscle are about 4,000IU/100g and they have many effective components, so it is known as healthy food. Therefore, many people have eel that cooked roast and hot-water extract in Korea. WHO encouraged that daily edible content of vitamin A is 2,000IU. Now, Japan government proposes the weight of roasted eel in lunch basket as 50g. But, Korea government does not proposes in every related aspects. Therefore, we researched content of vitamin A in hot-water extract from eel and optimal processing condition of hot-water extract from eel, in order to determine a proper edible volume. The content of vitamin A in eel hot-water extract sold at a market was about 200 IU. This study resulted from the fact that many eel hot-water extracts lacked the vitamin A. The reason was that the lipids were removed for taste on processing. But, The content of vitamin A in eel hot-water extract which didn't removed lipid on processing was about 800IU. Therefore, in drinking for 3packs per day, eel hot-water extract might have adjusted 100mL per pack which is almost consistent with the recommended dietary allowance of vitamin A in WHO.