초록

AI-Helper

살아 있는 개량조개 속에 들어 있는 토사의 배출에 대하여 실험한 결과를 요약하면 다음과 같다. 1) 토사는 주로 입수관 및 출수관 주변, 아가미 주변, mantle주변 그리고 중장선을 위시한 소화 기관 속에 존재하였다. 그리고 소화기관 속에 들어 있는 모래의 크기는 $180\times10\mu\~550\times200\mu$정도의 극히 작은 것들이었다. 2) 시료를 밑바닥에 깔아 놓은 것과 중간층에 수하시킨 것 그리고 단층으로 깔든지 또는 수하시킨 것과 두껍게 깔든지 또는 수하시킨 것 사이에 토사의 배출에 있어 뚜렷한 차이는 찾아 볼 수 없었다. 3) 개량조개는 처음 1시간 정화시키면 약 $50\%$의 토사를 배출하며, $22\~26$ 시간만에 배출물의 양이 거의 일정한 값에 도달하지만, 배출물 속에 토사가 배출되지 않을 때까지는 약 42시간 소요되었다. 4) 토사의 배출에 미치는 PH의 영향을 보면 개량조개가 살고 있는 환경 해수보다 약 1정도 높은 쪽(pH 8.75)이 빨랐다. 5) 토사의 배출에 미치는 온도의 영향은 개량조개가 살고 있는 환경 해수의 온도 때가 온도를 더 높였을 때보다 토사의 배출이 빨랐다. 6) 토사의 배출에 미치는 염분 농도의 영향은 개량조개가 살고 있는 환경 해수의 염분 농도($30.61\%_{\circ}$)보다 약 배로 묽은 쪽($15.14\%_{\circ}$)이 배출이 빨랐다.

Abstract ▼ AI-Helper

A study on the purification of the surf clam Mactra Sulcataria REEVE for the remove of sand and fecal piles was conducted in the laboratory. The sand was mostly distributed around the inhalent and exhalent siphon, mantle and gill, and were also distributed in the digestive tract including the mid-gu...

A study on the purification of the surf clam Mactra Sulcataria REEVE for the remove of sand and fecal piles was conducted in the laboratory. The sand was mostly distributed around the inhalent and exhalent siphon, mantle and gill, and were also distributed in the digestive tract including the mid-gut gland. The sand particles in the digestive tract were extremely small and their sizes were about $180\times10\mu\;to\;550\times200\mu$. It could be seen that there was little, if any, difference in the rate of sand removal when either the hanging Purification method was used or the method of laying the surf clams in thick or thin layers on the bottom of the experimental vessel was used. The surf clam removed about $50\%$ of its sand during the first hour of purification. The weight of the removed sand and fecal piles on a dry basis reached a constant value after 22 to 26 hours of purification. After 42 hours of Purification, no sand could be seen in the fecal piles. The surf clam removed the sand in its body more rapidly when it was in sea water with the pH of 8.75 than when it was in natural sea water. Also high temperature had a much greater depressing effect upon the removal of sand In the surf clam than did natural sea water. Also low salinity had greater accelerating effect upon the removal of sand in the body than did natural sea water. However the surf clam died when the salinity was $8.19\%_{\circ}$.