In general, most large ponds are under aerated. It is common that the top 3 to 4 feet contains oxygen, but the deeper water has little to no oxygen. Here are some things you may not know about what happens to ponds without aeration-
A slight change to the water can make a dramatic shift in the oxygen level, which is crucial for fish. The low levels that normally do not bother fish, can turn into a crisis situation. Treating pond water with a chemical algaecide or aquatic herbicide consumes oxygen from water as the weeds/algae die. Large algae blooms & weed growth that covers a large portion of the pond can also consume oxygen. Green water is especially notorious for major oxygen consumption. Temperature rising in water also decreases oxygen levels. Weeds and algae produce oxygen in water during the day, but consume oxygen at night. Any one of these things could push a pond with low oxygen levels to the breaking point.
Ponds without aeration will typically have a separation of warm (oxygenated) and cool (low or no oxygen) waters. During the transition of seasons of fall to winter and again from winter to spring the water "turns over." Sometimes when this occurs, fish can be caught in the wrong area and left without oxygen. This can result in fish loss.
Here's why you NEED aeration:
Increases oxygen in times of need like hot water and chemical treatments. Aeration also increases the amount of space where your fish can live in your pond. This can boost your fish health and population growth. Your fish aren't the only thing that needs oxygen! Bottom aeration boosts the effectiveness of beneficial bacteria by increasing dissolved oxygen levels needed for bacteria to remain active. Introducing oxygen not only aids the bacteria's effectiveness, it also limits a chemical reaction from occuring in muck. When muck is exposed to low oxygen areas, a reaction occurs that releases phosphorus into water (this is an algae causing nutrient). In regions of the country where freeze over occurs in winter, bottom aeration keeps openings in ice to limit the risk of a fish kill. The elimination of the thermocline(separation of warm and cold waters) through aeration can also lower the risk of seasonal fish kills.
Leaves and vegetation accumulate in fall creating a build up of organic sludge in the pond. Years of sludge build up can be unsightly and smelly. Sludge releases nutrients in water which can trigger algae blooms, promote weed growth, and result in poor fish health.The question for many is how can I clean my pond without [...]
It may seem strange to be talking about Winter fish stress while temperatures are still mild. However, now is the time to take action if you manage an aging pond or lake. As organic debris accumulates over years, it becomes more and more important to consider taking action to reduce biological oxygen demand and the [...]
Struggling to make a decision on what treatment option would be best for your leaking pond? Here are some leaking pond scenarios and the sealing solutions:Constructing a new pond, unsure how well it will hold water: Sodium Bentonite would be our recommendation. Bentonite works well in new pond construction. Dosage rate is determined by the [...]
Green water plagues ponds of all sizes. It is so much more difficult to manage than string algae. No one wants their pond to look the same color as their grass. Often a pond with green water has a foul odor too!Whether your pond is 500 gallons or 5,000,000 gallons, green water is a serious [...]
Duckweed and watermeal are floating weeds that reproduce VERY FAST! One week you have some growing along the edges of the pond, and the next, your whole pond is covered. Besides looking HORRIBLE, having the surface completely covered by weeds can lead to a fish kill.These weeds usually re-appear in your pond in late spring [...]
What is your pond's purpose? Something to look atBoating/SwimmingFishingIrrigation/AgricultureJust for the beauty:You have your pond because it's pleasing to the eye. You find enjoyment from sitting and watching the wildlife in and around the pond. This type of pond must be maintained, here's why- over time, the beauty disappears as weeds and algae plague the water. [...]
The use of copper sulfate to manage algae was once a common practice. Copper sulfate successfully killed algae in ponds. Although copper sulfate provided a successful short term solution for pond owners, the long term situation grew worse. Copper sulfate reacts quickly, leaving contact time to the day its applied. Copper settles to the bottom of the [...]
Many things add air to the water like waterfalls/streams, fountains, plants, wind, but is it enough? Tricky question!!In general, most large ponds are under aerated. This doesn't mean your fish are dying! Your fish can absolutely survive in your pond as is. Fish can live in very low oxygen environments. It is common that the [...]
Be sure to measure the ice thickness before each use! Turn off pond aeration systems or relocate diffusers to shallow areas that will not be used for on-ice activities. If the pond routinely has flowing water use extreme caution because flowing water can cause differential ice thickness and weak spots in the ice.Stay away from [...]