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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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Underground sea water is widely utilized for land based aquaculture in Cheju province, Korea nowadays. Salinity of this water(20~30 ppt) is slightly lower than natural sea water but because of its good water quality and temperature which is maintained at 16~18℃ all year-round, many fish farmers are using this water for finfish culture.
To evaluate the possibility of utilizing underground sea water for the seed production of the flounder, Paralichthys olivaeceus, hatching rate of fertilized eggs, survival rate of hatched larvae, and growth rate of the juveniles were tested with various salinity levels ranged from 14.1 ppt to 40.2 ppt.
The salinity ranges which showed over 70% survival rate for fertilized eggs to hatchout were 33.7 ppt~40.2 ppt, for hatched larvae to 2-day-old were 20.6 ppt~40.2 ppt, from 10-day-old to 12-day-old were 27.2 ppt~40.2 ppt, and from 45-day-old to 47-day-old were 20.6 ppt~40.2 ppt. Two hundred day old fingerlings showed no mortality when exposured to 7.6 ppt~40.2 ppt for 2 days.
All fish died within 3 days when 45-day-old juveniles were transferred directly from normal sea water to 14.1 ppt sea water. However, they were all survived when transferred first to 20.6 ppt for 3 days then to 14.1 ppt sea water.
The highest growth rates of fingerlings reared at 4 different salinities (33.7, 27.0, 31.0, or 15 ppt) were obtained at the 27 ppt group followed by 33.7, 21.0, 15 ppt respectively. The relationship between the days of rearing (X) and the total length of the fingerlings were as follows :
33.7% group : Y=8.8109 + 0.1104X(r=0.999)
27.0% group : Y=8.6797 + 0.1208X(r=0.997)
21.0% group : Y=8.4081 + 0.1052X(r=0.990)
15.0% group : Y=8.4309 + 0.0995X(r=0.990)
To evaluate the possibility of utilizing underground sea water for the seed production of the flounder, Paralichthys olivaeceus, hatching rate of fertilized eggs, survival rate of hatched larvae, and growth rate of the juveniles were tested with various salinity levels ranged from 14.1 ppt to 40.2 ppt.
The salinity ranges which showed over 70% survival rate for fertilized eggs to hatchout were 33.7 ppt~40.2 ppt, for hatched larvae to 2-day-old were 20.6 ppt~40.2 ppt, from 10-day-old to 12-day-old were 27.2 ppt~40.2 ppt, and from 45-day-old to 47-day-old were 20.6 ppt~40.2 ppt. Two hundred day old fingerlings showed no mortality when exposured to 7.6 ppt~40.2 ppt for 2 days.
All fish died within 3 days when 45-day-old juveniles were transferred directly from normal sea water to 14.1 ppt sea water. However, they were all survived when transferred first to 20.6 ppt for 3 days then to 14.1 ppt sea water.
The highest growth rates of fingerlings reared at 4 different salinities (33.7, 27.0, 31.0, or 15 ppt) were obtained at the 27 ppt group followed by 33.7, 21.0, 15 ppt respectively. The relationship between the days of rearing (X) and the total length of the fingerlings were as follows :
33.7% group : Y=8.8109 + 0.1104X(r=0.999)
27.0% group : Y=8.6797 + 0.1208X(r=0.997)
21.0% group : Y=8.4081 + 0.1052X(r=0.990)
15.0% group : Y=8.4309 + 0.0995X(r=0.990)
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