Clearance and ingestion rate according to different culture condition in the sulf clam, Tresus keenae

사육조건에 따른 왕우럭, Tresus keenae의 여수율과 먹이섭취률

In juvenile size, the maximum clearance rate and ingestion rate were 15mm, which is the 70.8 mL/h, 4245.0×104cells/h, respectively. But the lowest clearance rate and ingestion rate were found at 5mm, which is the 4.1 mL/h, 246.0×104cells/h, respectively. The highest clearance rate and ingestion rate of AFDW seen at 7.5mm, with 3.3 mL/mg AFDW/h, 196.0×104cells/mg AFDW/h, respectively. According to the results of water temperature, clearance rate and ingestion rate were lowest at 10℃, showing the 0.3 mL/h, 20.3×104cells/h, respectively. The highest clearance rate and ingestion rate were 25℃, which is the 16.6 mL/h, 993.4×104cells/h, respectively. But in 30℃, clearance rate and ingestion rate decreased to the 12.9 mL/h, 772.6×104cells/h, respectively. With respect to the food density, the experiment groups with 30×104 cells/mL and 240×104 cells/mL showed the clearance rate of 21.1 mL/h and 2.3 mL/h, respectively. But the experimental group with 120×104 cells/mL or more showed decreased clearance rate. While, the maximum ingestion rate was at 60×104 cells/m, showing the 876.2×104cells/h.

치패 크기별 실험에서는 5mm치패의 여수율과 먹이섭취률은 각각 4.1 mL/h, 246×10⁴세포/h였으며, 15mm치패의 경우는 각각 70.8 mL/h, 4245.0×10⁴세포/h로서 치패 크기가 클수록 증가하였다. 회분외 건중량(AFDW)당 여수율 및 먹이섭취률은 7.5mm 치패에서 각각 3.3 mL/mg AFDW/h, 196.0×10⁴세포/mg AFDW/h로서 가장 높았다. 수온별 실험에서 10℃에서 여수율과 먹이섭취률은 각각 0.3×10⁴세포/h였고, 25℃에서는 각각 16.6 mL/h, 993.4×10⁴세포/h로서 25℃까지는 온도가 높을수록 여수율과 먹이섭취률이 증가하였으나, 30℃에서는 각각 12.9 mL/h, 772.6±298.6×10⁴세포/h로서 25℃보다 낮았다. 먹이생물 농도에 따라서는 여수율은 30×10⁴세포/mL일때는 21.1 mL/h였고, 농도가 240×10⁴세포/mL일 때는 2.3 mL/h로서 농도가 낮을수록 증가하였다. 먹이섭취률은 먹이생물의 농도가 60×10⁴세포/m일때 876.2×10⁴세포/h로서 최대값을 나타내었다.