Abstract

<p><em>The objective of this </em><em>study</em><em> </em><em>wa</em><em>s to </em><em>determine</em><em> sedimentation rate and dispersion of organic waste from </em><em>lobster culture on cage </em><em>in Ekas Bay, </em><em>West </em><em>Nusa Tenggara Province. Measurement of sedimentation rate was conducted every month during the process of </em><em>cultivation lobster</em><em>. This measurement was done by setting up a sediment trap under and around the cage</em><em>.</em><em> The result of this </em><em>study</em><em> show</em><em>ed</em><em> that sedimentation rate under the </em><em>lobster cage</em><em> within 270 days ranged from 14.92 to 27.33 (20.66±4.60) g/m<sup>2</sup>/day. Th</em><em>e</em><em> organic waste d</em><em>id not</em><em> disperse far away from the cage because </em><em>of </em><em>the </em><em>small </em><em>current rate </em><em>around</em><em> the cage location </em><em>of</em><em> 0.068 to 0.2 m/s. </em><em>Feces and residual feed s</em><em>ettling velocities</em><em> followed the current direction within the </em><em>range </em><em>of</em><em> 0.0373 to 0.072 m/s with 8.50 m of water depth</em><em>. According to this result, </em><em> dispersion of feces particle and residual f</em><em>ood</em><em> </em><em>was</em><em> between 8.24 and 45.58 m from the cage. </em><em>In order to prevent an accumulation of waste particle on the water bottom, the distance between cages needs to be set to at least twice of the </em><em>farthest distance of particle dispersion </em><em>which is </em><em>2 x 45.58 = 91.16 m or </em><em>about </em><em>100 m. </em><em> </em></p> <p><em> </em></p> <p><strong><em>Keywords:</em></strong><em> sedimentation rate, waste dispersion, </em><em>lobster culture</em><em>, Ekas Bay</em></p>

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