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Abstract ▼ AI-Helper

The hatching rate of Aedes togoi mosquito eggs was investigated by using a vacuum pump to obtain reduced level of dissolved oxygen in water. Six different grades of the low air pressure used were 100, 200, 300, 400, 500 and 600 mmHg for 1, 2, 4, 8 and 24 exposure hours. The results obtained a...

The hatching rate of Aedes togoi mosquito eggs was investigated by using a vacuum pump to obtain reduced level of dissolved oxygen in water. Six different grades of the low air pressure used were 100, 200, 300, 400, 500 and 600 mmHg for 1, 2, 4, 8 and 24 exposure hours. The results obtained are as follows: Ae. togoi eggs were more hatchable to the low air pressures for 2, 4 and 8 exposure hours. The hatching rates were significantly different between 600 mmHg groups such as 28.4%, 48.3% and 36.6%, and control groups such as 3.8%, 2.7% and 9.9% for 2, 4 and 8 hour treatments, respectively. However, the hatching rates of the one hour exposure groups did not show significant differences with those of the control groups regardless of low air pressure levels. The hatching rates of 24 hour exposure groups (Avg. 82.4%) under the low air pressures of 500 and 600 mmHg were significantly different with those of the control groups (Avg. 55.8%) although the levels of the low air pressure did not affect to the egg hatching rate at the same exposure period with the lapse of 1 hour. Also, the hatching rates under higher low air pressures such as 500 and 600 mmHg for 2-8 hour exposure periods were significantly higher than those of control groups. Therefore, the low air pressure method using a vacuum pump is suggested as one of hatching methods to use for the simultaneous hatching of Ae. togoi eggs.

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