Oxygen levels in the pond?

[Douglas]

Recently I've been holding back on asking this bc I was trying to research it myself, but there doesn't seem to be an answer so I'll ask it here.

Is it normal for goldfish/koi to dart up to the surface and swim back down. I'm not feeding, so it makes me think it's due to low oxygen. I have an air stone as well as a small waterfall.

Has anyone seen this behavior before and should I be concern?

 

[Mmathis]

Do you still have your fish in 40 gallons?

 

[poconojoe]

They might be snatching up bugs. I see my fish do that sometimes.
I also have some goldfish that like to eat pellets like that. They'll dart straight up, grab the food and dive under. It's kind of funny.

 

[Douglas]

@Mmathis no I decided to diy a 200 gallon for them bc the 40 gallon was changing parameters too quickly. There are 6 goldfish in total. The biggest is 5 inches. And some white cloud minnows.

@poconojoe I was thinking that too but usually my minnows will already taken all the bugs off before my other fish even sees it.

 

[Lisak1]

The behavior you are describing sounds normal. Low oxygen would have your fish hanging out at the surface gulping air. It may be there are bugs on the surface, or at least they think there are.

 

[Douglas]

They seem to have stopped from my observations. Just strange behavior