Disolved Oxygen in a tank

[David K. Bradley]

I was reading a article on test kits for testing the levels of oxygen in a tank.

After reading the article, these questions came to mind:

[1] Is it possible to have to much disolved oxygen in a tank set up?

[2] If it is possible to have to much disolved oxygen in a tank set up, how does it effect our aquatic creatures?

[3] Could to much disolved oxygen cause float/bloat in fish and other types of aquatic creatures as well?

 

[thewaterboy]

im not sure but i think it would be impossible to have too much oxygen dissolved in the water. The only way to do this would be to completely seal the top of the tank off and continue to pump O2 into it. eventually the pressure builds and prevents the O2 in the water from escaping at the surface. Its is kind of like opening a new coke bottle...it fizzes like hell because you released the pressure inside the bottle and now the CO2 can escape much more quickly. So i think that without sealing the top of the tank off you can never get too much O2 in the water...it will just leave at the surface.

 

[Toby_H]

[1] Is it possible to have to much disolved oxygen in a tank set up?

NO

It is possible for water to have trapped air but it is not possible in typical aquarium conditions. It happens in natural conditions (rivers) when there is a tremendous amount of turbulence (rapids) and it is a very temperorary condition that fixes itself. It can also be created in labratory conditions under presure.


[2] If it is possible to have to much disolved oxygen in a tank set up, how does it effect our aquatic creatures?

Fish's gill's are designed to remove oxygen from water, but they are not designed to remove air bubbles (entrapped air) from water. Thus these air bubbles become trapped in the fish's gills, then abdomen, causing a form of "Bloat".


[3] Could to much disolved oxygen cause float/bloat in fish and other types of aquatic creatures as well?

The common fish disease 'Bloat' is a bacterial infection and a byproduct of the bacteria is a gas that collects in the abdomen of the fish. It is not a result of entrapped air.

 

[David K. Bradley]

[1] Is it possible to have to much disolved oxygen in a tank set up?

NO

It is possible for water to have trapped air but it is not possible in typical aquarium conditions. It happens in natural conditions (rivers) when there is a tremendous amount of turbulence (rapids) and it is a very temperorary condition that fixes itself. It can also be created in labratory conditions under presure.


[2] If it is possible to have to much disolved oxygen in a tank set up, how does it effect our aquatic creatures?

Fish's gill's are designed to remove oxygen from water, but they are not designed to remove air bubbles (entrapped air) from water. Thus these air bubbles become trapped in the fish's gills, then abdomen, causing a form of "Bloat".


[3] Could to much disolved oxygen cause float/bloat in fish and other types of aquatic creatures as well?

The common fish disease 'Bloat' is a bacterial infection and a byproduct of the bacteria is a gas that collects in the abdomen of the fish. It is not a result of entrapped air.

nc_nutcase:

Thanks for the update on this question. Do appreciate the help with understanding this question more up close.

 

[CHOMPERS]

As usual, Toby has beaten me to the post. And he is right too. One little tweaking is that it is possible to have a super saturation condition of dissolved gasses. Typically this is when cold saturated fill water is added to a warm tank that is also at or near its saturation. (The saturation level is temperature dependent.) Cold water will hold more dissolved gasses then warm water, so the warming causes a super saturated condition. The condition is very temporary and the end result is tiny bubbles everywhere in the aquarium.

Another condition that can cause super saturation is when the water company uses aeration in the treatment of the water (as in the removal of sulfur or ozonation). When the water pressure is relieved at the tap, super saturation occurs and micro bubbles can end up in the aquarium.

 

[David K. Bradley]

Wow! That's a mouthful worth re-reading again. Thanks to both you and nc_nutcase. I appreciate the advice and information of this thread. It makes all sense to me now. I think this thread can be closed now and that's all I have to say about that!