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Too many plants or animals using the oxygen in the system can deplete it and create the potential for a fish kill, especially after several days of cloudy weather or low light when less photosynthesis takes place.Dissolved substances in the water, such as naturally-occurring tea-colored tannins, can prevent sunlight from penetrating down into the water column.If you have a small fish pond with an aerator, turn it on during cloudy weather. Fewer daylight hours (during autumn and winter) also influence photosynthesis, as well as temperature and humidity.Changes in the condition of a leaf (aging, tearing, etc.), the arrangement of leaves on a branch, even the shape and size of a leaf affects the amount of photosynthesis that occurs in a plant; so much so that two different types of plants have developed over time, based on their tolerance for light.Different types of plants use different forms of chlorophyll for photosynthesis.
In most plants, photosynthesis occurs in special cells known as chloroplasts.
After sundown, without sunlight, photosynthesis slows considerably, or even stops.
So, in addition to the usual oxygen demands (from fish, macro-invertebrates, tadpoles, etc.), algae and plants are also pulling oxygen from the water.
Photosynthesis is a chemical process that occurs in many forms of bacteria and virtually all plants, including aquatic plants and algae.
Using just three simple ingredients (carbon dioxide, water, and sunlight) plants and bacteria are able to make their own food.