Any coldwater rays ?

[Zoodiver]

Rayman beat me to it. I've run falkneri into the mid 60F range no problem.

 

[follarin63]

I was wondering about Argentinian rays - Jeremy Wade was fishing some cold-looking rivers for rays in one episode of River Monsters.

In this video Jeremy Wade was fishing Potamotrygon brachyura ( short tailed river Stingray) but i don't know the temperature of the water

 

[Dan F]

In this video Jeremy Wade was fishing Potamotrygon brachyura ( short tailed river Stingray) but i don't know the temperature of the water

Thanks for the information!

I looked at water temperatures in the Parana River drainage, and found that it can drop to as low as 11C (52F) at times.
http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442008000200017

Also, fishbase lists its range as "temperate".
http://www.fishbase.org/Summary/SpeciesSummary.php?ID=53772&AT=Yabebi

I also found this little snippet interesting:
"They also mentioned that by early autumn, when water temperatures started to fall, this was the only species of river ray still found."
http://www.iucnredlist.org/details/161687/0

So it looks like at least a couple rays, while certainly not true "coldwater" fish, certainly can tolerate lower-than-tropical temperatures, at least for part of the year.