Yeast able to ferment at 4 deg C

[silverfox]

Right folks, Got a good one for you here.
I pressed some Conference Pears about 14 days ago. Put some in two off 2 litre PET bottles (Previously sterilised) & added 5 ml 10% Sulphite to each. I put the bottles in the Fridge.
Last weekend I checked on the bottles which were laid on their sides & found one of them to be fermenting. The other bottle was still OK. I tried releasing the Gas by slowly opening the cap but it was like a volcano. I closed the cap & put into the freezer. Even when it was Frozen it was like a volcano. But slowly it died down.
I have never come across a yeast that can start at Fridge Temps.
I checked the Fridge thermometer & it was at 4 deg.C
Have I found a new Yeast that might be worth using? Or is it just another wild rogue yeast.
Any body got any idea?

Silverfox

[NorthernWiner]

That's not unusual at all. Some of these wild yeasts are very robust. Two years in a row I've purchased Viognier juice from a local distributor, and two years in a row it's been fermenting when I picked it up, despite the fact that they transport and store this juice at 35 F (1.7 C).

Last year I added sulphite and froze it, then thawed and added my own yeast. This year I just let it go with the native yeast, and it turned out fabulous.

[Her Lushness]

Bad luck Paul, you've not discovered the Fabulous Freezing Fermenting Yeast yet...