the present paper allow the farmer to estimate the actual oxygen transfer of
Taiwanese paddlewheels if the level of oxygen saturation is known. Working
aquaculture ponds are dominated by algal blooms, where DO generally becomes
saturated during daylight. Actual oxygen transfer from an aerator will be negative
whenever pond water oxygen is above the saturation level. At such times the speed
of aeration should be reduced to control SOTR to as low a value as practical
without stalling out motors or loosing effective pond circulation. Good results were
obtained when speed was cut 2 h after sunrise and full speed operation was resumed
at sunset (Peterson and Indran, 2001; Peterson, 2001). In another trial of several
ponds stocked with marine shrimp, it was decided to delay 2 h after sunset before
switching back to full speed, with no adverse effect (Peterson and Berry, unpublished).
Electrical harmonics make it difficult to control many ponds with a single
variable frequency inverter
the present paper allow the farmer to estimate the actual oxygen transfer ofTaiwanese paddlewheels if the level of oxygen saturation is known. Workingaquaculture ponds are dominated by algal blooms, where DO generally becomessaturated during daylight. Actual oxygen transfer from an aerator will be negativewhenever pond water oxygen is above the saturation level. At such times the speedof aeration should be reduced to control SOTR to as low a value as practicalwithout stalling out motors or loosing effective pond circulation. Good results wereobtained when speed was cut 2 h after sunrise and full speed operation was resumedat sunset (Peterson and Indran, 2001; Peterson, 2001). In another trial of severalponds stocked with marine shrimp, it was decided to delay 2 h after sunset beforeswitching back to full speed, with no adverse effect (Peterson and Berry, unpublished).Electrical harmonics make it difficult to control many ponds with a singlevariable frequency inverter
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