However, at night without sunlight for photosynthesis, excessive amounts of phytoplankton or algae consume extra oxygen that can lead to low oxygen situations. When you have wide swings in day and night oxygen levels, there is a chance of low oxygen concentrations. Secchi disk is a weighted disk, approximately 8 inches in diameter, and painted with alternate black and white quadrants. The average of the depths at which the disk disappears and reappears is the Secchi disk visibility. Plankton is not excessive.
Pond is in good condition.
If pond's turbidity is caused by phytoplankton than the plankton is so dense that low dissolved oxygen may be a problem. The use of brand names in this publication does not imply endorsement of the products or services named or criticism of similar ones not mentioned. Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age, or disability.