Building a Fish Tower in a pond

From YT: Why would an aquarium only for inside? I made one in my pond for my pond fish. Easy to make and they love it.
Spacedog79says...

The question I always have when I see these is do the fish really like it, or does the change in pressure on the water under vacuum affect their swim bladders so they get too buoyant and get a bit stuck inside it?

AeroMechanicalsays...

That's an interesting question, but I figure the water pressure in the box can't be different than the pressure difference you'd get from the equivalent change of depth, which can't be very much. Surely their bladders allow them to swim up or down a few feet. I doubt they're stuck in any way. Maybe they congregate there because the water in the box is warmer or because there is more light. Maybe they just find it interesting. I guess I shouldn't feel bad about fish in an aquarium since they seem to enjoy the experience.

Spacedog79said:

The question I always have when I see these is do the fish really like it, or does the change in pressure on the water under vacuum affect their swim bladders so they get too buoyant and get a bit stuck inside it?

Paybacksays...

Lower water pressure means they would sink easier, not float.

Spacedog79said:

The question I always have when I see these is do the fish really like it, or does the change in pressure on the water under vacuum affect their swim bladders so they get too buoyant and get a bit stuck inside it?

newtboysays...

The pond water circulates through the open bottom, so the O2 levels are the same as the pond.
Yes, mine got dirty and had to be removed and cleaned monthly. Since the fish didn't use it, that only lasted 3-4 months before I gave up. I used a tall glass vase about 10-12" wide and 2 1/2' tall. Maybe if I put floating food in it they'll use it, I'll probably try again when the water is warm enough to go in the pond and set it up, they look neat.

antsaid:

Do they have enough oxygen and doesn't that get dirty fast like algae?

*music *pets *nature *engineering

antsays...

If you try again, then please record and share.

newtboysaid:

The pond water circulates through the open bottom, so the O2 levels are the same as the pond.
Yes, mine got dirty and had to be removed and cleaned monthly. Since the fish didn't use it, that only lasted 3-4 months before I gave up. I used a tall glass vase about 10-12" wide and 2 1/2' tall. Maybe if I put floating food in it they'll use it, I'll probably try again when the water is warm enough to go in the pond and set it up, they look neat.

Zawashsays...

Lower water pressure would inflate the swim bladder, increasing the buoyancy. Higher pressure makes the bladder easier to empty, making it easier to sink.
You get this effect when scuba diving - it is harder to get down from the surface than to get deeper when you're already several feet below.

Paybacksaid:

Lower water pressure means they would sink easier, not float.

Paybacksays...

I bow to your experience. Apparently it's a bit counter-intuitive.

Zawashsaid:

Lower water pressure would inflate the swim bladder, increasing the buoyancy. Higher pressure makes the bladder easier to empty, making it easier to sink.
You get this effect when scuba diving - it is harder to get down from the surface than to get deeper when you're already several feet below.

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