Pond Algae Pond Scum
This article is on loan from Lake Advice
We are all aware that pond scum may be the fuel production plant of the future, but in the mean time, it is probably not something you want in your recreational fishing pond. For one thing, it is ugly, for another, it is often stinky, and to make matters worse, it can do harm to other forms of aquatic life, and harbor potential disease carriers like mosquitoes.
Different types of pond algae
So, is all algae bad? The answer is a resounding NO! In fact, the best means of preventing pond scum, or filamentous algae, is by producing another type of algae. Plankton. This single cell algae will remain suspended in water, providing food for the tiny animals that provide food for the larger life forms, which in turn, provide food for your fish, and, if you are a successful angler, food for you.
Pond algae control using algae
Not only does this type of algae feed the fish, it also colors the water. That nice green or blue green tint that you see in healthy ponds and lakes is suspended algae, and one of the best services it provides is tinting the water, thereby preventing sunlight from reaching the bottom of the lake or pond, preventing the growth of unwanted vegetation, and providing pond algae control.
Yes, pond scum, like most aquatic plant life, gets it’s start at the bottom of the pond, and as it gains oxygen, it floats to the top where it produces all sorts of undesirable conditions, like the ones mentioned above, and including lousy fishing conditions, oxygen deprived fish, and frustration.
Algae for tinting the water
Getting rid of pond scum can be a difficult task, and if the conditions that allowed it are not changed, it will return. Remember, the problem is sunlight reaching the bottom of the pond, so something must be done to prevent it from doing so. This could include raising the water level, which may not be possible in all cases, dredging or otherwise making the lake deeper, or coloring the water. The last, is usually the chosen option. There are dyes which can color the water, but, if fish production is what you desire, remember that dyes do not feed the fish. In small ponds for catfish production, where regular feedings occur, this may work, but where no feeding takes place, or where other types of fish are desired, dyes are not the answer. Once again, plankton is needed to continue the life chain, and prevent the pond scum problem.
How to produce plankton to prevent pond algae
So, how do we produce this plankton? The answer is simple: Fertilize the pond. Now before you start thinking that it is a crazy idea, let me do a little explaining. Fertilizer, usually a fertilizer high in phosphorous, will encourage algae production through a process known as algae bloom, and this will produce the coloring needed to stop pond scum. There are a few things you need to check before you fertilize.
- First, get rid of the existing pond scum, and give it time to decompose.
- Second, test the water pH. Anything higher than 8.6, and you need lime to lower the pH. Something between 6.8, and 8.6 is ideal. If it needs correcting, correct it before proceeding.
- Third, check the secchi depth. It should be between 18 and 24 inches. If the secchi depth is less than 18 inches, there is another problem. If it is more than 24, begin fertilizing as soon as possible, and continue the process throughout the summer, or until the depth is less than 18 inches.
There are other factors, like muddy water, which will need to be solved before treatment, and you will need to know the details like how to use a secchi disk, and how much fertilizer, which are covered in these articles:
Lake Management | Pond Algae Pond Scum
Lake Management Lake Weed Control Water Depth Secchi Depth
Flocking Reducing Sediment In Lakes
Preventing Pond Scum In Farm Ponds
Making A Fish Pond From A Farm Pond