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Rainforests of the World 

January 20, 2010

Amazonian Stingray Pup Born!

A Smooth back river stingray (Potamotrygon orbignyi) pup was born on January 16, 2010.

newborn stingray pup in amazon gallery

Photo by: Rachael Tom

newborn stingray pup in amazon gallery

Photo by: Rachael Tom

Stingrays reproduce by aplacental viviparity which means that the eggs hatch and the babies develop inside the female’s body but there is no placenta to nourish the pups. Embryos initially feed on yolk, then receive additional nourishment by absorbing “uterine milk” from their mother. The young are born as miniature adults, free-swimming and ready to feed on their own.

newborn stingray pup in amazon gallery

Photo by: Rachael Tom

The main consideration in caring for the newborn pup will be making sure it gets enough to eat. Newborn pups are not strong swimmers and may not be able to compete for food with all of the adult rays. Pancake has been doing wonderfully, though, and has already had his first couple of meals of tubifex and bloodworms.

Filed under: Fish — brooke @ 2:10 pm


  1. Thank you for sharing the great news. I had no idea that stingrays had pups! I found out about Pancake’s birth through Facebook! Congratulations! I think we may need to come for a visit.

    Comment by Jennifer — January 20, 2010 @ 3:47 pm

  2. Went today to see Pancake but couldn’t find him.

    Comment by Gail — January 24, 2010 @ 9:39 pm

  3. Hi Gail, we made the decision to remove newborn freshwater ray pups to an aquarium behind the scenes where we can keep a closer eye on them while they grow. But hopefully on your visit you saw our motoro (orange-spotted) ray pup. This girl was born at our temporary facility downtown and is a little over one year old.

    Comment by brooke — February 1, 2010 @ 12:45 pm

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