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In order to investigate a reasonable rearing density and the possibility of high-density rearing, flounder, Paralichthys olivaceus, juveniles of 2.53±0.24 ㎝ in total length and 1.12±0.12 ㎝ in body height were used in this study. The initial rearing density of them was 10 (D10), 20 (D20), 30 (D30) and 40 (D40) individuals per 137.75 ㎠ of bottom area, respectively.
Ranges of water temperature and specific gravity during the rearing period of 65 days were 21.0∼27.0 ℃ and 1.024∼1.026, respectively, showing relatively higher values than that of natural sea water. Dissolved oxygen during the rearing period was 5.4∼7.5 ㎖/ℓ and inorganic nitrate was 0.07∼0.48 ppm in NH₄-N, 0.006∼0.33 ppm in NO₂-N and 3.89∼34.06 ppm in NO₃-N.
Growth in total length and body height of the juveniles in four rearing density at the end of the experiment was 8.17±0.80 ㎝ and 4.16±0.39 ㎝, the highest in D20 and 7.72±0.40 ㎝ and 3.94±0.21 ㎝, the lowest in D10. Significant differences, however, were not recognized between the slope values of growth regressions in four rearing density. Slope values of the relative growth between total length and body height of the juveniles in four rearing density were 0.5346, the highest in D10 and 0.5165, the lowest in D30, but there were no significant differences in those values.
Survival rate of juveniles at the end of the experiment was 90 % in D10, D20 and D30, but that of D40 was 75 %.
The relationship between total length × body height (X) and body surface area of ocular side (Y) to calculate the rate of Y to bottom area in rearing tank (covering rate) as an indicator of rearing density was expressed by a linear regression, Y=0.5994X＋0.1840.
Covering rate in four rearing density at the end of the experiment was ranged 1.2∼4.1 times. Judging from the covering rate above 4 times, it seems to be possible rearing the flounder juveniles in high-density.
Ranges of water temperature and specific gravity during the rearing period of 65 days were 21.0∼27.0 ℃ and 1.024∼1.026, respectively, showing relatively higher values than that of natural sea water. Dissolved oxygen during the rearing period was 5.4∼7.5 ㎖/ℓ and inorganic nitrate was 0.07∼0.48 ppm in NH₄-N, 0.006∼0.33 ppm in NO₂-N and 3.89∼34.06 ppm in NO₃-N.
Growth in total length and body height of the juveniles in four rearing density at the end of the experiment was 8.17±0.80 ㎝ and 4.16±0.39 ㎝, the highest in D20 and 7.72±0.40 ㎝ and 3.94±0.21 ㎝, the lowest in D10. Significant differences, however, were not recognized between the slope values of growth regressions in four rearing density. Slope values of the relative growth between total length and body height of the juveniles in four rearing density were 0.5346, the highest in D10 and 0.5165, the lowest in D30, but there were no significant differences in those values.
Survival rate of juveniles at the end of the experiment was 90 % in D10, D20 and D30, but that of D40 was 75 %.
The relationship between total length × body height (X) and body surface area of ocular side (Y) to calculate the rate of Y to bottom area in rearing tank (covering rate) as an indicator of rearing density was expressed by a linear regression, Y=0.5994X＋0.1840.
Covering rate in four rearing density at the end of the experiment was ranged 1.2∼4.1 times. Judging from the covering rate above 4 times, it seems to be possible rearing the flounder juveniles in high-density.
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UCI(KEPA) : I410-ECN-0101-2009-529-015298654