Preliminary Studies on the Growth Performance of the Subtrophic Noble Scallop Chlamys nobilis in Korean Waters - with a Special Focus on Nursery Life

흔한가리비, Chlamys nobilis의 치패성장 및 중간육성

To evaluate the aquaculture potential of a subtrophic noble scallop, Chlamys nobilis in Korean waters, nursery growth of the species was studied on two remote Jeju coasts, Jigwido and Ongpori. The early growth performance of the first 60 days after settlement was expressed as: $SL=0.1664e^{0.0579x}$ ($r^2=0.924$), where x stands for days after settlement and SL for shell length. The early spats sized 1 mm in average shell length became $4.1{\pm}0.8\;mm$ after a month of nursery culture, thereafter grew to $13.0{\pm}1.9$, $23.1{\pm}3.1$, $30.3{\pm}4.3$, and $33.6{\pm}5.2\;mm$ for consecutive 4 months in Jigwido coastal area. Mean growth gains (mean daily gains in parenthesis) were $76.7{\pm}7.7$ ($165.6{\mu}m$), $73.3{\pm}7.3$ ($154.0{\mu}m$), $69.4{\pm}8.4$ ($140.0{\mu}m$), and $68.7{\pm}8.5\;mm$ ($137.4{\mu}m$), in depths of 5, 10, 15, and 20 m, respectively. The growth rate was significantly decreased as cultured in deeper place (p < 0.05). As culturing density was higher, growth performance of the scallop was decreased in both locations. Overall, in our preliminary study, the growth performance of scallop in Korean waters was not better than that in Japan, but it seems to be worth doing further study for successful introduction to Korean waters.

흔한가리비 종묘생산시 부화 유생사육시 파판에 부착 후 60일째까지의 경과일수(X)에 따른 자패의 각장(SL) 성장은 $SL=0.1664e^{0.0579x}$($r^2=0.924$) 회귀직선식으로 나타낼 수 있었다. 지귀도에서 사육한 각장 1 mm 치패는 1개월후에 $4.1{\pm}0.8\;mm$로 성장하였고 2, 3, 4 및 5개월째에는 각각 각장 $13.0{\pm}1.9$, $23.1{\pm}3.1$, $30.3{\pm}4.3$, $33.6{\pm}5.2\;mm$로 성장 하였다. 시험기간 동안 지귀도 연안에서 흔한가리비의 수심별 일간 각장 성장량은 165.6, 154.0 140.0, $137.4{\mu}m/day$ 순으로 수심이 깊어질수록 성장량은 낮았고(p < 0.05), 사육밀도별에서는 각각 168.3, 145.8, 115.2, $101.8{\mu}m/day$로 사육밀도가 높을수록 성장이 느렸다(p < 0.05). 제주연안에서의 흔한가리비 치패의 중간육성은 제주시 옹포리연안보다는 서귀포시 지귀도 연안이 성장 및 생존율에서 높아서 양식가능성이 높았고, 일본의 경우와 비교해서는 성패까지 사육할 경우, 3-6개월 정도 더디었지만 양식가능성은 충분하다고 생각되며, 양식의 성공률을 높이기 위해서는 여름철 태풍 내습에 대한 시설물의 안정성이 우선 고려되어야 할 것으로 사료된다.