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東京灣産 문치가자미 Limanda yokohamae(GU¨NTHER)의 分布와 移動
朴鍾洙,淸水 誠 군산대학교 1990 群山水産專門大學 硏究報告 Vol.24 No.1
Distribution and movement of Limanda yolohamae were estimated by sampling surveys with small trawlers at 20 stations from November 1977 to Feburuary 1987 in Tokyo bay, Japan. From summer to Autumn, small size(below 135㎜) which was known to influence the next year's catch is appeared in southern area, but it is distributed in the wide area of the bay in winter. In spring, large size (above 135㎜) was distributed in the wide area of the bay, but small size was not appeared at all. The distribution of the Limanda yolohamae covered mainly a wide area of the bay from autumn to spring, but in summer, it was concentrated towards the southern parts. From the results of the mark-recapture experiment, this southern concentration is considered to be caused by the movement of the Limanda yokohamae.
東京灣産 문치가자미 Limanda yokohamae(GUNTHER)의 成熟과 産卵期에 관하여
박종수(Park Jong soo),청수성(Makolo Simizu) 군산대학교 수산과학연구소 1990 水産科學硏究 Vol.- No.6
Maturity and spawning season of the Limanda Yokohamae in Tokyo Bay was examined from seasonal changes in percentage occurrence of mature gonad index. The materials used in this study consist of 1,025 specimens from April 1986 to may 1988. Analysis showed that spawning season Iasted from December to March in next year. The peak of the spawning occurs from end of November to middle of February. Individual fish spawn only one time each spawning season. No specimens smaller than 135mm, body length, are found maturing in both females and males. of them are maturing at one year old.
박종수(Jong Soo PARK),청수 성(Makoto SIMIZU) 군산대학교 수산과학연구소 1994 군산대학교 수산과학연구소 연구논문집 Vol.2 No.-
Age and growth of the Marbled Sole Limanda Yokohamae in Tokyo Bay were studied by otolith reading of 1,070 fishes from May 1986 to April 1988. Examination of the outer margins of the otoliths showed that the hyaline zone as annulus was formed once a year and that its formation was completed at the end of the spawning season (Feb. to Apr.). Growth of the fish was expressed by the von Bertallinffy's equaion as Lt=255.7 {1-exp [0.505 (t-0.149)]} for males and Lt=376.9{1-exp[ -0.303(t-0.202)]} for females, where Lt is standard length in mm and t is age in years. It was found that the growth of males and females differs, with the females showing a higher growth than the males at each estimated age. Growth in body weight was also examined. Most of the fish examined were found to be not more than three years old, although the oldest fish were four years old for males and seven years old for females.
東京滿山 문치가자미 Limanda yokohamae(GUNTHER)의 資源量 變動의 解析
박종수(Jong-Soo PARK),청수 성(Makoto SIMIZU) 군산대학교 수산과학연구소 1994 군산대학교 수산과학연구소 연구논문집 Vol.2 No.-
Population dynamics of Mabled sale Limanda yokohamae(GUNTHER) in Tokyo bay. Japan has been studied by virtual population analysis (VPA) for multi cohort and experimental fishing. Based on the biological data, the present parameters of the Limanda yokohamae stock at the Tokyo bay, Japan were estimated as follows: natural mortality coefficient(M) were 0.313 for male and 0.250 for female, terminal fishing motality coefficient(F) were 2.190 for male, and 0.798 for female, rate of exploitation(E) was 30% to 50%. From the result of virtual population analysis for multi cohort, the population size were estimated from 3,5000,000 to 9,200,000 fishes, according to the result of experimental fishing, estimated stock size were 2,400,000 to 8,700,000 fishes. Stock size difference of the two methods were about two times in 1987, however, other years has been showed from 0.8 to 1.5 times. Both method has been showed same increase and decrease tendency of the c. p. u. e. and catches. From the isopleth diagram plot by Beverton and Holt's yield per recruit, the catches could be increase two times for female, 1.3 times for male than present aspects by the fishing management. And further, as reducing fishing effort, extension of mesh size and rising the length at first caputre, are reasonable in order to manage the stock at the optimum level.
Studies of the Rare - Earth Magnets
Jae Gui Koh,F. Pourarian,S. Simizu,S. G. Sankar 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Specimens of Nd-Fe-B magnets with various compositions have been prepared and their physical properties investigated. The basic composition of Nd-Fe-B system is Nd_(15-x)Dy_xFe_(78.5)B_(6.5) with x varying between 0 and 2. Addition of Dy improves the coercivty significantly. The bulk density of the finished magnets is -7.5 g/cc. A remanence of 1.25 kG, and energy product of 42.1 MGOe have been observed with magnets containing x=1. Thermomagnetic measurements of alloys showed that the starting alloys exhibited a Curie temperature. of -330 C.