カキ養殖漁場における漁場老化に関する基礎的研究-3-マガキ・フンの沈降速度と運搬距離

概要

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The sinking rates of oyster faeces in quiescent water ranged from 0.4 to 1.8cm/second. Larger faeces sank faster than smaller ones, but the faeces larger than 1.2mm2 (length×width) sank at approximately equal rates of 1.0 to 1.7cm/second. There were no differences in the sinking rates at the temperatures of 14°C and 26°C. Oyster faecal materials were transported and deposited by currents. The distance of transportation and deposition of faecal materials during settling (0.5m) was within the range of 2m at the current velocity of 1cm/second, and at the current velocity of 2cm/second was within the range of 5m. At the velocity of 5.5cm/second, the faecal materials were in a state of suspension and transported farther.
日本水産學會の論文