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Pond Algae – The Good, Bad, and Ugly

The word “algae” is often used as a catch-all term to describe many nuisance aquatic plants. However, that’s doing this diverse species a considerable disservice. While there are many nuisance species of algae out there, there are also some very good ones from which aquatic life in your pond cannot exist without them.

Algae play a vital role in the health and longevity of any natural or man-made body of water—no matter if it’s an HOA, golf course, or backyard pond. We’re going to look at what algae is, the role it serves, and the pros and cons that they bring to any pond they inhabit.

What are Algae?

Contrary to what many people think algae are not classified as plants—instead they’re a very diverse group of aquatic organisms. They all can perform photosynthesis, that is, turning sunlight into the oxygen that they need to survive. Pond scum, algal blooms, and even seaweed are all different variations of algae. They live in the water column of every single pond and provide food for larger organisms.

Algae Benefits

Algae are at the bottom of the food chain when it comes to aquatic life. Sportfish such as crappie, bass, and trout will often feed upon smaller prey fish, such as minnows. Those minnows tend to eat zooplankton, which in turn consumes the microscopic planktonic algae. Without this vital food source, the bigger game fish won’t have much to eat and, as a result, won’t grow as large.

Algae Problems

The biggest complaint that people have about algae is aesthetics—and sometimes the offensive smells that a massive bloom gives off. A golf course or homeowner’s association pond that’s covered in a thick green muck or slime is not very attractive and can actually reduce property values and quality of life.

These algal blooms range from utterly harmless to extremely toxic. The so-called “blue-green algae” is actually a bacterium that produces dangerous cyanotoxins. If ingested by pets or human beings, it can cause potentially fatal results. In fact, if you get a few drops on your skin, you could wind up very sick from such a small exposure.

Why Do Algal Blooms Occur?

A “bloom” is the very rapid increase of the amount of a specific type of algae organisms in a body of water. Water, sunlight, and nutrition conditions are just right for a population explosion. Some algal blooms are completely harmless and only serve as an aesthetic nuisance, while others, such as blue-green algae, pose life-threatening risks to both animals and humans that come in contact with it.

How to Prevent a Bloom?

There are a few things that the managers of man-made ponds, such as HOA and golf courses, can do to help mitigate a nuisance bloom. For instance, the rich organic muck at the bottom of any pond serves as a 7-course buffet meal to many nuisance algae species. All that it takes is one warm sunny day, and the pond will be covered in an unsightly, and often smelly, nuisance mat of algae.

While there are chemical solutions on the market to help combat outbreaks, the vast majority of them do little to nothing to remove the root cause: the rich organic muck at the bottom.

This is why it’s advised to have a professional dredger come in once or twice a year to physically remove the debris at the bottom, utilizing an oversized vacuum pump that operates from a floating barge. As an added benefit, the organic muck that’s removed can be re-used as nutritious fertilizer for plants and grass.

What Happens When a Bloom Dies?

Algae blooms are a self-sustaining problem. When billions of the little critters die off, they sink to the bottom of your pond and add a massive amount of dead organic material to the pile. There are no beneficial bacteria to eat away the problem at these oxygen-deprived depths, so each new algae bloom tends to be much more severe than the one prior.

Over time the decomposition process of the dead algae will use up an extreme amount of oxygen in the water. Noxious gases such as sulfur and methane will also be released into the air, causing people in the local area to hold their noses—and complain.

Dredging Your Ponds

The best way to help prevent a nuisance algae outbreak is to simply dredge your ponds once or twice a year. Getting rid of the organic debris at the bottom will help dramatically improve the health of the pond—including the beneficial bacteria.

If you’re tired of fighting algae outbreaks, or require a dredger, give us a call at (817) 377-8512 or contact us on our website. American Underwater Services, we specialize in helping HOA, golf course, and residential homeowners remove the organic muck from the bottom of their ponds.




Anthony Di Iulio the founder, president and co-owner of American Underwater Services, Inc., started his business in 1999 with only three employees. Today this commercial diving company employs nearly 30 people and handles over 500 projects annually. Anthony moved to Fort Worth from Louisiana with his family in 1976. He worked summers during high school welding underwater for a marina on Benbrook Lake. Eventually he took scuba lessons after almost drowning on the job. Those lessons led him to training at a deep sea diving school in Houston, which included training on offshore oil rigs. Anthony spent several years in Louisiana working on offshore rigs and on inland jobs at power plants and dams before starting American Underwater Services, Inc.


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