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Some freshwater stingrays from Argentina tolerate low temperatures. For example potamotrygon falkneri. Here is a map where this species occurs: http://www.scielo.br/img/revistas/ni/v9n1/a21fig11m.jpg In wintertime the temperature of the water in south Argentina is around 59F (15°C).

The tigerray is Potamotrygon tigrina http://www.practicalfishkeeping.co.uk/content.php?sid=3881 The blacktailed antenna is Plesiotrygon nana http://www.scielo.br/scielo.php?pid=S0031-10492011000700001&script=sci_arttext

Hi, RINCON, G. 2006. Aspectos taxonômicos, alimentação e reprodução da raia de água doce Potamotrygon orbignyi (Castelnau) (Elasmobranchii: Potamotrygonidae) no Rio Paraná-Tocantins. Page 116 Índice Hepatossomático differs between rainy season and dry season meassurements were between 1.5 and 3.5

These stingrays were described last year: http://news.mongabay.com/2011/0309-hance_stingrays.html http://www.mapress.com/zootaxa/2011/f/z02776p048f.pdf

Captive breed Itaituba Ray (or P14) show both tail shapes. In wild ones the tip of the tail is mostly not complete so you can not see what shape they have. Pictures show two males second generation breed from wc grandparants. These rays are breed from the same pair. You can even see...

Hi siluk, nice pic of Tom and Sandra Here is Lucky and his brother and sister from the second offspring. They are wild things :) @andersp90 and all 100%pure

Hi Frank, nice development of this ray. I think it is the same ray we saw in November as small pup? Here is a picture showing the markings.

Congrats, they look each time better and better! Here is the one I hold, name was T1 (that means first pup from Tess) now we call him Lucky, because he had the luck to stay with us.

Second link is working now. This technique was used at least for a study on P. orbignyi from Tocantins. The sexuell maturity was estimated at the age of 5 with a maximum longevity of 10 years: Rincon, G., 2006. Aspectos taxonômicos, alimentação e reprodução da raia de água doce Potamotrygon...

"Estimates of growth rates and longevity in sharks and rays are typically obtained by microscopic examination of the banding pattern deposited within the vertebrae." http://psrc.mlml.calstate.edu/current-research/age-and-growth/ and in great detail here...

My cb female was first time pregnant with age of 4 years and a diskwitdh of 15". Bites on the back have nothing to do with mating and do only damage the female. I put them together first time when the female was 3 years old (my goal was to take pictures of the undamaged beauty of the female...

Hi David, nice find! the ray may be a smuggeld sp. itaituba, released because he was to big to ship ... he is really skinny

This document contains a actual table with the scientific names of south american freshwater stingrays and where the species live. At the end of the table you can see three undescribed species, Potamotrygon sp. "cururu" is the histrix, "itaituba" is P14 and "pearl" is, you guess it pearl...

http://en.wikipedia.org/wiki/Bowmouth_guitarfish

:ROFL: The pic for Galaxy P14 is my ray and my pic ...

All scientific work I'm aware of say black ray in Xingu system = leopoldi. Some leopoldi were caught from scientist at Sao Felix do Xingu and we would say these are BD but the scientist labeld them as leopoldi. Obviously leopoldi have a wide range of pattern, much wider than previously thought...

I'm so sorry Frank an Nico, what a severe loss for you.

I have observed, that the new stinger usually grows where the last stinger was shed. What I recorded is, that the young rays are born with one stinger. The second stinger is growing above the first stinger. Then the first stinger (the lower one) is shed and the next (the third) is growing...

Wild Galaxy. He was released. http://www.johnpetchey.co.uk/images/arria%203.jpg

Here we go http://www.jbl.de/images/gallery/container/std/58_2508.jpg http://www.jbl.de/images/gallery/container/std/58_2252.jpg http://www.fishbase.gr/images/species/Posch_u0.jpg