Unusual cold tolerant Fishes for outdoors.

[RichardM]

Hi all,

New to UKaps, I'm interested in more unusual cold tolerant Fishes for keeping outdoors - Aphanius mento or round tail paradise fish especially. But I also hear you have to have the right strain/locality to be fully winter hardy in UK, can people shed some light on this please?
I gave up asking questions on those Facebook groups...

Thanks all.

R

 

[shangman]

I was given some aphanius mentho by @killi69 a few years ago, he had a beautiful huge colony in one of his ponds. I put them in a tub outside in my garden and I never see them really, it’s too full of plants and don’t get much sun.

In the very cold winter 2 winters ago, I assumed they died like my rice fish, but this summer I topped up the tub with some spare rainwater which had mosquito larvae in it and suddenly I saw loads of movement and flashes of blue ! So they’ve survived very well, if a bit shy.

@Courtneybst was given some too and I think they still do well for him with no intervention

 

[RichardM]

Thanks for replying shangman, I'm surprised your Japanese Medaka/Rice fish didn't survive as meant to be incredibly hardy.
I plan on having heavily planted ponds and tubs, shy fish aren't a problem for me.

 

[Tyko_N]

Not really unusual, but what about common minnows (Phoxinus phoxinus)? Manageable size, nice colours and outgoing personalities (I met some up i the Swedish mountains that would nibble yours even). The main drawback would be that they need plenty of oxygen and a fair amount of swimming space, so are more suitable for a shaded pond than a tub in full sun. You wouldn't have to worry about cold winters though.

 

[Maf 2500]

Axolotls. Not a fish but ticks the box for unusual and can thrive outoors in the UK in unheated ponds.

Wow - I did not know that this was possible - can they really survive the winter?

 

[RichardM]

Wow, I did not know that this was possible - can they really survive the winter?

Yes, they then only breed seasonally & spawn under the ice.

 

[shangman]

Thanks for replying shangman, I'm surprised your Japanese Medaka/Rice fish didn't survive as meant to be incredibly hardy.
I plan on having heavily planted ponds and tubs, shy fish aren't a problem for me.

Yes I was surprised (and sad!) too. That winter there were two very cold snaps, they survived the first so I thought they were ok, but the second cold snap wiped them out. Now I bring them in for the winter and put them out again in spring. Actually need to do that this weekend… good reminder

When it comes to unsuaul fish, you might try contacting WildWoods Enfield which have fantastic knowledgeable staff and sell both aquarium and pond supplies. They are usually very happy to order something unusual if they don't already have it in stock and they ship too (you have to phone them or contact on Facebook).

 

[RichardM]

Axolotls. Not a fish but ticks the box for unusual and can thrive outoors in the UK in unheated ponds.

Hi, I've done this first when I lived in the West of Ireland. Had to leave my Axolotls behind because of import/Brexit restrictions. One female is at least 18 years old and lived it's whole life in ponds. Better slime coats, grew larger and no health problems compared to aquarium kept animals.

 

[RichardM]

Not really unusual, but what about common minnows (Phoxinus phoxinus)? Manageable size, nice colours and outgoing personalities (I met some up i the Swedish mountains that would nibble yours even). The main drawback would be that they need plenty of oxygen and a fair amount of swimming space, so are more suitable for a shaded pond than a tub in full sun. You wouldn't have to worry about cold winters though.

Hi, yes I do like our native Minnow. But I'll be relying on the vegetation to do all my filtration & no technology to give them a flow.

 

[RichardM]

Yes I was surprised (and sad!) too. That winter there were two very cold snaps, they survived the first so I thought they were ok, but the second cold snap wiped them out. Now I bring them in for the winter and put them out again in spring. Actually need to do that this weekend… good reminder

When it comes to unsuaul fish, you might try contacting WildWoods Enfield which have fantastic knowledgeable staff and sell both aquarium and pond supplies. They are usually very happy to order something unusual if they don't already have it in stock and they ship too (you have to phone them or contact on Facebook).

Thanks for the head's up 👍

 

[RichardM]

I've been really tempted for exactly this reason. I know a guy who breeds them outdoors here and they are the biggest, healthiest axolotls I have ever seen. They almost look like a different species than their runty tank raised cousins.
Only reason I haven't done it is that I'd feel bad about them eating all the newts and other amphibians that use the pond.

 

[Courtneybst]

@Courtneybst was given some too and I think they still do well for him with no intervention

Yes! Chiming in on what's already been said; I've kept Japanese Ricefish and Aphanius mento outside and all year round for about 2 years now.

Contrary to @ 's experience, even under a thick layer of ice (recorded temperature of -7c) or extreme 40c heat, they've done just fine. Not that their experience is invalid, but the more people who contribute, the more we'll collectively understand.

What their kept in will also play a big role. The Ricefish are in a pond with a very small surface area (1m x 0.5m) but it's 4ft deep. The Aphanius tub is probably a 1m circle and the body of water is less than 50cm deep, so they are the real troopers.

 

[Conort2]

I’ve had medaka do perfectly fine under thick ice, could still see them moving around under a couple of inches. Had some standard white cloud mountain minnows also do well. Tried gold white clouds but these seemed to struggle with the cold. Also currently have ranchus. I was told they can’t be kept outdoors but they’re doing fine. They managed last winter although I wouldn’t consider last years winter as a particularly cold one.

Cheers

 

[RichardM]

I’ve had medaka do perfectly fine under thick ice, could still see them moving around under a couple of inches. Had some standard white cloud mountain minnows also do well. Tried gold white clouds but these seemed to struggle with the cold. Also currently have ranchus. I was told they can’t be kept outdoors but they’re doing fine. They managed last winter although I wouldn’t consider last years winter as a particularly cold one.

Cheers

Hi Conort2,

I've always looked at White Cloud Minnows with interest, heard mixed reviews with outdoor year round keeping with them.
For your WCMM, did you use a filter/pump to give a flow or just no technology & use plants for natural filtration etc.

Thanks,
R

 

[Conort2]

Hi Conort2,

I've always looked at White Cloud Minnows with interest, heard mixed reviews with outdoor year round keeping with them.
For your WCMM, did you use a filter/pump to give a flow or just no technology & use plants for natural filtration etc.

Thanks,
R

I’ve had them in no tech and they done extremely well. They had bred all through the summer and I had plenty by the winter. The golds were with a filter but were kept alongside the ranchus so didn’t have any fry survive.

 

[Rafayel.medaka]

You can try macropodus species. The reason why the medakas died is probably because they could not breathe due to the ice on the water surface.

 

[hypnogogia]

You can try macropodus species. The reason why the medakas died is probably because they could not breathe due to the ice on the water surface.

I’ve had medaka do perfectly fine under thick ice, could still see them moving around under a couple of inches. Had some standard white cloud mountain minnows also do well. Tried gold white clouds but these seemed to struggle with the cold. Also currently have ranchus. I was told they can’t be kept outdoors but they’re doing fine. They managed last winter although I wouldn’t consider last years winter as a particularly cold one.

Cheers

 

[Rafayel.medaka]

If he doesn't break the ice, in a few days he will only see dead fish under the ice.
I have been wintering my medaka in my garden since 2017