피조개의 채묘와 초기성장

SPAT COLLECTION AND THE GROWTH OF ANADARA BROUGHTONI SCHRENCK

1973년 8월 1일부터 1974년 4월 8일까지 경남 창원군 구산면 석곡만에서 자연산 피조개의 치패를 채묘하여 경남 거제군 사등면 사곡리 연안에 이식하여 천연산치패의 탐묘 및 성장에 관한 실험을 하였다. 그 결과, 1. 석곡만의 피조개 유생의 출현양은 비교적 적었고 큰 양적변동이 없었다. 그러나 길이 1.5m, 폭 12cm의 짚으로 만든 섶 부착기에 각각 $200\~400$개체의 유생이 부착한 것으로 보아 산업적인 채묘방법으로 충분한 가치가 있는 것으로 판단된다. 2. 부착치패의 평균각장은 1973년 9월 17일 0.54mm 10월 21일 4.11mm, 11월 25일 10.47mm였고, 1974년 4월 8일에는 11.08mm였다. 3. 각장(L)에 대한 최대방재륵 길이 (R)의 관계식은 각장 2.5mm 이하일 때 R=0.7393L-0.0080이었고, 각장 2.5mm 이상일 때 R=0.8448L-0.2491이었다. 또, 각장(L)에 대한 각폭(B)의 관계식은, 각장 2.5mm 이하일 때 B=0.3505L+0.0527이었고, 각장 2.5mm 이상일 때 B=0.4448+0.1722이었다. 이와 같이, 각장 2.5mm 부근에서 각장, 최대방재륵 길이 및 각폭의 비성장에 변환이 일어나는 것을 알았다. 4. 각장에 대한 전체 무게의 곡선식은, 각장 16mm 이하일 때 W=0.19957 $L^{2.5726}$이었고. 각장 16mm 이상일 때 W=0.20602 $L^{2.8400}$으로서 각장 16mm 부근에서 비성장의 변환이 일어나는 것으로 나타났다.

The results from the experiment of natural collection and growth of arkshell(Anadara broughtoni, SCHRENCK) spat, which was collected at Seok-gok Bay located at Chang-weon-gun, Korea, and grown in the 1ittoral zone of Sa-gok-ri, Geo-je-gun, Korea, beginning from August 1,1973 to April 8,1974 are as follows; The larvae of arkshell came out from the very first day of the study August 1, which continued till the end of September, whose amount was not so much varied, but relatively continuous. The drifting larvae were also rather small amount, from which some 200 to 400 larvae were attached through the respective collecting equipment made from straw with the dimension of length 1.5m and breadth 12cm. It is regarded relatively large amount collected and recognised worth while enough to use as the industrial collecting method. The average shell length of spat attached was 0.54mm on 17th September, 4.11mm on 21st October, 10.47mm on 25th November in 1973 and 11.08mm on 8th April in 1974 whose progress was recognized relatively faster, comparing with the other up-to date report, The relationship between the shell length(L) and the longest radial rib(R) was as follows: Below 2.5mm of the shell length: R=0.7393 L -0.0080 Above 2.5mm of the shell length: R=0.8253 L-0.2595 And the relationship between the shell length (L) and the shell breadth (B) was as follows: Below 2.5mm of the shell length: B=0.3505 L +0.0527 Above 2.5mm of the shell length: B=0.4631 L -0.3602 The exponential curve equation between shell length (L) and the total weight (W)was as follows : Below 16mm of the shell length: W=0.19957 $L^{2.5726}$ Above 16mm of the shell length: W=0.20602 $L^{2.8400}$ In view of the above the relative growth among the shell length, the longest radial rib and the shell breadth was changed in the vicinity of 2.5mm of the shell length. And relationship between the shell length and the total weight was changed in the vicinity of 16mm of the shell length.