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김용호(Yong Ho KIM),이생동(Saeng Dong LEE),김백균(Baeg Gyun KIM) 군산대학교 수산과학연구소 1994 군산대학교 수산과학연구소 연구논문집 Vol.1 No.-
Over the period of April to November 1983, the shrimp, Trachypenaeus curvirostris(STIMPSON), were sampled monthly at fish markets in Gunsan to investigate some ecological characteristics. The spawning season was from May to September. The sex ratio of female to male shows seasonal variation with annual mean of around 76/24. The diameter of the egg ranges from 101μ to 188μ with a mode in 150μ during immatured stage, but with the coming of spawning time the egg size grows larger to 170~346μ with a mode in 250μ. The food items were mainly benthic animals such as polychaetes, cephalopods, crustaceans, etc.
1992 년도 제 10 회 학술발표회 발표요지 ( Proceedings of the Society , 1992 ) : 넙치 면역글로블린의 특성
박수일,방종득,박정우,이생동 한국어병학회 1992 한국어병학회지 Vol.5 No.2
Two vibrio sp. strains were isolated from disease catfish(Silurus asotus). The present isolates were identified as Vibrio ordalii based on their biological and biochemical characteristics ; they were positive for acid production from glucose, lactose, maltose, sucrose and salicine, while negative for arabinose, galactose, inocitol and xylose. They are named KL-1 and KL-2. KL-1 and KL-2 strains were similar to physiological characteristics ; growth was observed at pH 5 to 10 and in 0% to 6.0% NaCl. Two strains did not growth at a concentration above 7.0% NaCl and pH10. This bacterium was injected into health catfish hypodermically. Such injection was found to induce haemorrhagic ulcers very similar to those observed in naturally infected fish. At 24h post-infection, the red spot developed around the injection site and grew bigger to from a red sport area. At 120h post-infection, the muscle ncerosis was extended near the ventral fin. The seventy percent lethal dosage was appeared to water temperature at 25℃. Two strains were tested for drug senistiveity by plate method. KL-1 and KL-2 strains were sensitive to GM. K N, S and SxT, but resistant to CF. L₂ and VA.
양식 능성어 , Epinephelus septemfasciatus 대량 폐사에 관한 연구
전세규(Seh Kyu Chun),손상규(Sang Gyu Sohn),박명애(Myoung Ae Park),이생동(Saeng Dong Lee) 한국어병학회 1991 한국어병학회지 Vol.4 No.2
In the late summer of 1990 and 1991, mass mortality occured among cage-cultured grouper, Epinephelus septemfasciatus in south cost of Korea. The moribund fish didn`t feed and became pale or dark chestnut colour and irregularly swimmed due to the loss of equilibrium, finally the diseased fish fell down side away on the bottom or the surface of cage showing the bent of body and died. The diseased fish showed the extensive hemorrahge in brain, the swelling of spleen and bile duct as the specific syptoms of internal organs. So the gill, skin and other organs of the diseased fish were examined for the presence of pathogenic parasites and bacteria. The parasitic Trichodina sp. were detected only from the gill lamella of the diseased fish, but these parasites seemed to be not a direct causative agents that induced the gross mortality of the cultured grouper. because these parasites were also observed in normal grouper, yellowtail, red seabream and rock bream co-cultured with the diseased grouper in same or near cages. In the viral examination, although isolation of the causative agent by the use of estabilshed cell Lines, RTG-2 and CHSE-214, was not succeed, the normal grouper inoculated intramuscularly with the filtered homogenate of the organs of the diseased fish showed the same external and internal signs with the naturally infected grouper. They died within a week. By using the naturally and the artificially infected fishes, electron microscopic observation revealed numerous hexagonal or polygonal particles in the cytoplasm of liver cells. Based on the these results, we suggest that the mass mortality of the cultured grouper would be occurred by the infection of a viral agent.
산천어의 바이러스성 질병에 관한 연구 (1) : 산천어 치어의 병리조직학적 연구
손상규(Sang Gyu Sohn),박명애(Myoung Ae Park),이생동(Saeng Dong Lee) 한국어병학회 1991 한국어병학회지 Vol.4 No.2
In Feb., 1990 an epizootic disease to masu salmon fry, Oncorhynchus masou cultured at the hatchery of rainbow trout in Samchok, Kwangwon-do have broken out and induced high mortality over 70%. Externally, the diseased fish showed dark discoloration, abdominal distension with ascites, slight exophthalmus and fecal casts. Internally, the gill and the liver of diseased fish were edematous and pale, and the stomach of moribund fish contained the milkish fluid. Microscopically there was extensive necrosis of the hematopoietic tissue in kidney and spleen, and scattered necrosis of pancreas, liver and lateral muscle. Especially, the necrosis of lamina propria, muscle layer and tela submucosa in the digestive tract known as the typical signs associated with infectious hematopoietic necrosis virus was seen clearly.