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ISSN : 1225-3480
서해안 중남부 바지락 어장의 서식환경과 종패 발생 특성을 구명하기 위하여 2013년 4월과 8월에 19개소 바지락 어장에서 수질환경, 저질환경, 퇴적환경과 바지락 종패 분포 양상을 조사하였다. 수질환경에서 수온, 염분, 용존산소, pH는 지역적인 영향보다는 조사 시기에 따라 변화하는 것으로 나타났다. 저질환경에서 화학적 산소요구량과 산휘발성 황화물 농도는 모두 기준치 이하로 오염이 되지 않은 환경이었다. 퇴적환경에서 표층퇴적물의 퇴적상은 8개 퇴적상으로 다양하게 나타났으며, 자갈과 모래, 실트, 점토의 함량은 조립질 퇴적물이 높은 경향을 보였다. 퇴적물의 평균입도는 2.2 - 2.5 Ø로 조립한 경향을 보였고, 분급은 평균 2.6 - 2.7 Ø로 불량한 경향을 보였다. 바지락 어장의 노출시간은 1조석 주기 동안 평균 1시간 55분으로 나타났다. 노출시간이 가장 짧은 지역은 왕산으로 8분이었으며, 가장 긴 지역은 법산으로 4시간 35분이었다. 10-20 mm 크기의 종패는 당미, 주교, 라향, 법산에서는 4월에는 채집되지 않았으나 8월에는 전년도에 가입된 치패가 성장하여 양이 증가하는 일반적인 현상을 보였다. 반대로 도성, 왕산, 대천은 4월에 8월보다 많은 종패가 채집되었는데, 이는 2년 전에 가입된 치패가 너무 많아 성장이 지연되었기 때문으로 판단된다. 종패가 많이 가입된 어장은 수질과 저질 환경은 유의미한 차이를 보이지 않았으나 퇴적물의 입도에서는 뚜렷한 차이를 보였다. 즉 퇴적물의 평균입도가 조립하고 다양한 크기의 입자가 고루 섞여 있는 분급이 매우 불량한 곳에서 종패의 발생이 많은 것으로 나타났다.
In order to figure out the characteristic of the occurrence of manila clam seeds and its inhabited environment in the mid-south of West coast, investigated at 19 manila clam beds on April and August, 2013. Water environment were shown to be changed depend on time of investigation rather than geographical effect. Sediment quality were under reference value which means it is uncontaminated. Regarding the sedimentary environment, sedimentary facies of the surface deposit were as various as eight, with a higher tendency of coarse-grained deposit in the contents of gravel, sand, silt, and clay. The average exposure time of the manila clam farms was 1 hour and 55 minutes. At the 10-20 mm habitat density of seed clams, no seed clams were harvested in April at Dangmi, Jukyo, Rahang, and Beopsan, which showed a typical phenomenon where seed clams grew and increased in number in August. On the contrary, Doseong, Wangsan, and Daecheon showed the opposite results where more seed clams were harvested in April than August, presumably because the habitat density of seed clams was too high in the previous year to delay growth. More seed clams developed in the sedimentary environments with coarse sizes of average deposit particles, mixed with other particles of various sizes.
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