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Gases & Exchange

Hydrogen Sulfide Pond Gas – Not Very Common

Hydrogen Sulfide gas is a gas produced in an-aerobic pockets under water. These may occur anywhere there is deep sand or sediment, or in a sump with thick mulm. Hydrogen Sulfide Pond Gas –...

Carbon Dioxide in Aquaria and Ponds

Carbon dioxide is produced by the respiration (not photosynthesis) of both plants and animals. When you exhale, you produce Carbon Dioxide. Pretty much the same with fish except they don’t have bad breath like...

Hydrogen Peroxide For Dissolved Oxygen

Hydrogen Peroxide For Oxygenation – by Dr. Erik Johnson Hydrogen peroxide can be used to increase the dissolved oxygen in the system. The peroxide molecule dissociates into water and an oxygen free radical which...

What Should I Know About Feeding Koi in Warm Water?

Feeding fish in warm water is an interesting conundrum. To succeed you need a strong equilibrium between the fish, the water’s oxygen levels and the demand for it by beneficial bacteria (Equilibrium by luck...

Aeration – Oxygenation of Pond Water

Aeration – Oxygenation of Pond Water Aeration – by Doc Johnson “Warm water carries less dissolved oxygen than cold water. Aeration becomes of paramount importance in the summertime. In the winter, low dissolved oxygen...

Oxygen, Aeration, and Oxygenation in Ponds and Aquaria

Oxygen is essential to almost all living things. Water carries a pitifully small amount of oxygen but fish have been designed to make the best of it. Oxygenation is atmospheric. Not bubbles. The only...

Why Carbon Dioxide is a “Thing” in Fish Medicine and Their Fishy World

Carbon Dioxide Impact on Koi Fish Health via PH Carbon dioxide is produced by most life forms in the process of respiration. When you (and the fish) “breathe out” you’re releasing Carbon Dioxide. Even...

Hydrogen Sulfide Gas is a Rare Problem But It Kills When It’s Present.

Hydrogen Sulfide is not a common problem in fish ponds, as far as we know. (It *is* a problem in fish tanks, though. Especially at a major cleanout and with disruption of the sand...