Can you recommend aeration pump, please

[Dmitry]

Hello, My pond is kidney bean shaped . It has stream going in and out. Stream is alive from late autumn to about June or so. Depending on weather conditions( temperature, rainfall etc..) When full with stream running ,the pond is 70ft by 50ft and 6 feet deep at the center. Water drops for the rest of the summer gradually. Stays about 45 by 30, 3-4 feet deep in a middle with foot or so of muck underneath it. It has a lot of tadpoles, frogs, toads around and one snapping turtle.
I can't have koi since my downstream carries water for the lake nearby. Before I learned it I had 5 koi 5-6 inches but none survived more than a week .They were covered in spots and looked not healthy when died. I think it might be parasites and infections. It was April of 2014. I was thinking about adding some filters and oxygenation but never got to it.
This year I caught eight bluegills sunfish ( three to five inches long) from lake nearby and put it in my pond with little hope. It's been three weeks already and all of them are alive and active. Active to the point it's hard to find them. When I see them nearby and go there they swim away fast and hiding. I didn't feed the fish assuming pond has some natural food .If I threw some wax worms in a morning from far away they eat it well, not so much at midday.
Water seems clear with some algae growing in a middle. They seem to swim around that area a lot when I'm not nearby.
My concern is that stream is not delivering much water now and water level will start to drop soon. How can I help them to survive?I was thinking about adding oxygenation pump. What kind of pump I should get for pond like this?
P.S.: Sorry for the long post, was trying to cover all the details.

Dmitry, Yesterday at 2:04 AM Report

 

[rodsboys]

I've always though that if I ever moved out to a property with a dugout I would get a windmill for aeration. I see them all over the place here.

http://pondaeration.com/

 

[sissy]

I have a laguna one i got off ebay and i love it .I wish I had gotten the one with the 4 air stones because there air stones are fantastic

 

[Dmitry]

I've always though that if I ever moved out to a property with a dugout I would get a windmill for aeration. I see them all over the place here.

http://pondaeration.com/

Nice idea, my concern is hefty price and lot of woods surrounding property potentially blocking wind.

 

[Dmitry]

I have a laguna one i got off ebay and i love it .I wish I had gotten the one with the 4 air stones because there air stones are fantastic

What size would you recommend for the size of my pond? About 45' by 25' or so, bigger when stream is running?

 

[sissy]

I would get there biggest one .This one does 4 ft deep and I have air lines on every port .I keep one in each filter .The one that has 4 air stones is the biggest one .They come with every thing .It has to be protected from getting wet

 

[Dmitry]

I would get there biggest one .This one does 4 ft deep and I have air lines on every port .I keep one in each filter .The one that has 4 air stones is the biggest one .They come with every thing .It has to be protected from getting wet

How is your electrical bill. Do you see a large increase in bill $$$$ since you got it? Do you use at all times?

 

[sissy]

all laguna products are energy efficient .It says 45 watts .My pumps are laguna also .My electric bill has gone down since i got the 2 new pumps and aerator .I just got my bill last week and before all the add on fees it was 93 dollars .Laguna pumps hit a sweet spot so they never use as much electric as they state