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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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The study has been conducted to know an appropriate feeding strategy and effects of the rearing density on larval growth of the rockfish, Sebastes schlegeli. The results obtained are as fellowed ;
1. Thirty-day-old larvae reached at 25.25±3.76 mm in total length and 0.23±0.07 g in body weight in experiment A, at which rotifer was provided from the beginning to the end of 30-day experiment, Artemia from 3th to 18th day, and artificial feed from 13th to 30th day after hatching. When rotifer was provided for 30 days, Artemia from 6th to 18th day, and artificial feed from 18th to 30th day after hatching (experiment B), these larvae grew up to 27.52±2.50 mm in total length and 0.26±0.06 g in body weight. On the other hand, when rotifer and artificial feed were supplied with the same time schedule as shown in experiment B, and Artemia was feed from 6th to 30th day after hatching (experiment C), the total length and body weight of those larvae were 23.22±3.44 mm and 0.15±0.05 g, respectively.
The best result for larval growth was obtained from experiment B. The survival rates estimated were 57.6% in experiment A, 66.4% in experiment B, and 44.4% in experiment C.
2. The growth in total length of the larvae according to their rearing days could be represented by the following equations :
Experiment A : Y=4.350+0.116X+1.887X² (r=0.993)
Experiment B : Y=4.500+8.931X+2.221X² (r=0.994)
Experiment C : Y=4.478+5.734X+1.881X² (r=0.990)
The average number of Artemia nauplius intaken by the larvae was rapidly increased between 15th and 20th day afer hatching, and 9, 212, 242, 750, and 1,171 nauplius were found in the different sizes of larvae, whose total length were 5.65, 6.81, 9.45, 14.96, and 24.52 mm, respectively.
3. Larval growth in total length and body weight reared at four different densites (A; 1.8 kg/㎥, B; 4.0 kg/㎥, C; 5.0 kg/㎥, D; 6.2 kg/㎥) indicated that the best growth was found in experiment A, at which the larval were reared at the lower density and the final survival rates extimated were 92.9% in exp. A, 99.5% in exp. C, 89.0% in exp. B, and 88.2% in exp. D. The amount of production per cubic meter turned out to be 30.45 kg in exp. D, 25.89 kg in exp. C, 20.75 kg in exp. B and 10.48 kg in exp. A. therefore, considering both larval growth and survival rate, higher yields seemed to be attainable at the relatively high-rearing density.
1. Thirty-day-old larvae reached at 25.25±3.76 mm in total length and 0.23±0.07 g in body weight in experiment A, at which rotifer was provided from the beginning to the end of 30-day experiment, Artemia from 3th to 18th day, and artificial feed from 13th to 30th day after hatching. When rotifer was provided for 30 days, Artemia from 6th to 18th day, and artificial feed from 18th to 30th day after hatching (experiment B), these larvae grew up to 27.52±2.50 mm in total length and 0.26±0.06 g in body weight. On the other hand, when rotifer and artificial feed were supplied with the same time schedule as shown in experiment B, and Artemia was feed from 6th to 30th day after hatching (experiment C), the total length and body weight of those larvae were 23.22±3.44 mm and 0.15±0.05 g, respectively.
The best result for larval growth was obtained from experiment B. The survival rates estimated were 57.6% in experiment A, 66.4% in experiment B, and 44.4% in experiment C.
2. The growth in total length of the larvae according to their rearing days could be represented by the following equations :
Experiment A : Y=4.350+0.116X+1.887X² (r=0.993)
Experiment B : Y=4.500+8.931X+2.221X² (r=0.994)
Experiment C : Y=4.478+5.734X+1.881X² (r=0.990)
The average number of Artemia nauplius intaken by the larvae was rapidly increased between 15th and 20th day afer hatching, and 9, 212, 242, 750, and 1,171 nauplius were found in the different sizes of larvae, whose total length were 5.65, 6.81, 9.45, 14.96, and 24.52 mm, respectively.
3. Larval growth in total length and body weight reared at four different densites (A; 1.8 kg/㎥, B; 4.0 kg/㎥, C; 5.0 kg/㎥, D; 6.2 kg/㎥) indicated that the best growth was found in experiment A, at which the larval were reared at the lower density and the final survival rates extimated were 92.9% in exp. A, 99.5% in exp. C, 89.0% in exp. B, and 88.2% in exp. D. The amount of production per cubic meter turned out to be 30.45 kg in exp. D, 25.89 kg in exp. C, 20.75 kg in exp. B and 10.48 kg in exp. A. therefore, considering both larval growth and survival rate, higher yields seemed to be attainable at the relatively high-rearing density.
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