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ISSN : 1225-3480
벗굴의 종묘확보 방안을 모색하기 위하여 유생의 대량사육에 의한 인공채묘와 자연채묘율을 조사한 결과는 다음과 같다. 모패에서 방출된 D형 유생 (각장 153.4 <TEX>$\mu\textrm{m}$</TEX>, 각고 137.2 <TEX>$\mu\textrm{m}$</TEX>)을 3 톤짜리 F.R.R 수조에 5.8 개체/ml의 밀도로 대량 사육한 결과 유생사육 16일 째에 벗굴 유생의 성장률은 각장과 각고가 202.6%, 212.9%로 성장하여 310.9 <TEX>$\pm$</TEX> 9.8 <TEX>$\mu\textrm{m}$</TEX> ,292.2 <TEX>$\pm$</TEX> 9.1 <TEX>$\mu\textrm{m}$</TEX>이었으며, 부착시기인 사육 20일 째는227.1%, 241.8%가 성장하여 348.4 <TEX>$\pm$</TEX> 9.1 <TEX>$\mu\textrm{m}$</TEX>, 331.7 <TEX>$\pm$</TEX> 9.4 <TEX>$\mu\textrm{m}$</TEX>였다. 그리고 16일 째에는 사육 기간 중 일간 사망률이 가장 높은 0.160, 일간생존율은 0.840을 보이면서 생존율은 54.8%였으며, 사육 20일 째의 최종 생존율은 43.2%였다. 굴 패각, 가리비 패각, 피조개 패각 그리고 PVC 조각을 이용한 부착기질별의 인공 채묘율은 32.9%, 24.1%, 16.8%,10.0%로 굴 패각이 32.9% (131.9 개체/패각) 로 가장 높았으며, 단위면적당 부착율도 굴 패각이 2.69 <TEX>$\pm$</TEX> 0.31 개체/<TEX>$\textrm{cm}^2$</TEX>로 가장 높게 나타났다. 채묘방법에 따른 치패 부착율은 채묘기질을 수중에 시설한 수하식방법에서 54.2 개체/패각 (1.00 개체/<TEX>$\textrm{cm}^2$</TEX>) 보다 패각을 수조저면에 배열하는 바닥식이 83.8 개체/패각 (평균 1.69 개체/<TEX>$\textrm{cm}^2$</TEX>) 으로 높은 부착율을 보였다. 자연채묘는 노출보다는 비노출이, 채묘기질은 그물 등 부드러운 기질보다는 견고한 조개 패각을 이용하여 채묘 하는 경우가 높게 나타났으며, 수층별의 자연채묘는 표층보다는 저층에서 부착율이 높게 나타났다. 벗굴의 인공치 패는 부착 후 26일경에 각장 2.38 <TEX>$\pm$</TEX> 0.97 mm, 각고 2.16 <TEX>$\pm$</TEX> 0.86 mm로 성장하였고, 일간 성장률은 각장 3.75-7.69%, 각고 3.23-7.97%로 나타났으며 3개월 후 각각 28.58 <TEX>$\pm$</TEX> 2.39 mm, 31.65 <TEX>$\pm$</TEX> 2.03 mm로 성장하였다. 채표기질에 따른 부착율은 굴 패각, 가리비패각, 피조개패각 그리고 PVC조각에서 각각 10.3, 5.8, 4.0, 1.5개체로 굴 패각에서 가장 높게 나타났다.
This research was conducted to develop seedling production techniques in flat oyster, Ostrea dense lamellosa. The cultivation of larvae, artificial spat and spats collection in natural conditions rate were examined. In the mass culture tank (3 tons), average growth rates of the D Shape larvae of initial shell length (153.4 ㎛) and shell height (153.4 ㎛) were 202.6% and 212.9% at 16 days and 227.1%, 241.8% at 20 days, respectively. Instantaneous death and survival rate of the larvae were 0.160 and 54.8% at 16 days and 0.057 and 43.2% at 20 days, respectively. Collection rate of flat oyster from bottom using various collectors with oyster shell, scallop shell, ark shell and PVC plates were 32.9%, 24.1%, 16.8% and 10.0%, respectively. and the greatest collecting rate was 131.9 individuals/shell (32.9%) in laid collectors on the bottom. The collecting rate of the oyster larvae were better in laid collectors on the bottom 83.8 individuals/collection than in the suspended string 54.2 individuals/collection. in all collecting substrates. Early spats settled on collectors were grew to 2.38 <TEX>$\pm$</TEX> 0.97 ㎜ in shell length and 2.16 <TEX>$\pm$</TEX> 0.86 ㎜ In shell height at 26 days. The spats were grew to 28.58 <TEX>$\pm$</TEX> 2.39 ㎜ in shell length and 31.65 <TEX>$\pm$</TEX> 2.03 ㎜ in shell height during the 4 month mid-term cultivation. In the period of cultivation, the mean number of spats attached to collectors were 10.3 individuals at oyster shells, 5.8 scallop shells, 4.0 ark shells and 1.5 PVC plates, respectively.
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