Big cold water tank stocking

If you guys had a non- heated 1700x600x800 tank in the garage , due to the amount of electricity the heaters take , it's a cold water tank -in winter below 20 degrees , and summer about 26 degrees , what single specie would you guys stock it?
non small fish , just one or two big fish?

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not really a goldfish guy...
koi is also out of the question...they just grow to big...


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This is tricky to say, since we ourselves don't know the exact temperatures you'd expect, and "below 20 and up to 26 degrees" is a pretty massive range. Granted, the 600 litres you have won't heat up or cool down too rapidly, but there aren't too many fish that would happily live in that range of temperatures over a year.

Besides your coldwater regulars, mentioned above, the only other common fish that would be alright below 20ish degrees might be some species of tilapia or catfish (barbel) - local, big, and messy types of fishes. The keeping of local species is also a bit of a legal wobble that you might want to do some reading up on (start here). Barbel themselves would likely outgrow your tank anyway, given a few months.

There are more species that you could simply purchase, but I feel that they're smaller than you'd like. Why, specifically, do you want big species?

Regards,

 

I just like big fish , never been a fan of small fish...
this is a tricky question I know

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I have a 18000 L pool, 4 black solar panels, vinyl cover and pump going from 10 am till 3 pm and yesterday the water temp was 20 degrees. Surely you can work something out that can get your temp, on an 700 L tank, higher. Covering the tank during night time will also help.

 

solar panel isn't a bad idea...
I need something to bring/hold at least 600watt (2x 300w Jägers)
are those panels pricey?
blanket at night is an option yes ...

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also , my garage to drops to about 8/9 degrees during the winter , it's a corrugated iron roof , very big double garage

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Just get one large mouth bass when he outgrows the tank release him and get another

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Or eat it when it gets too big as releasing it would not help our local fish stocks. Bass are an invasive species

 

what about 1 peacock bass?

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One (small) Arapaima?

 

where would I get that even , they get fairly huge

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bass can handle these temps right?
18/19 in winter
26/27 in summer
A large mouth would eventually outgrow this tank?

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Yes bass can and they tast nice


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maybe I must try source one peacock bass first

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eish....
then I need to get a small solar panel or something

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peacock bass need very warm water and are very temp sensitive, peacock bass are south american cichlids and require same sort of water as oscars or blue acara
why not tilipia used in hydro farming cheap cold tolerant and still get around 40cm