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FAQs on Freshwater Stingray Reproduction

Related Articles: Freshwater Stingrays,

Related FAQs:  Freshwater Stingrays, FW Stingray Identification, FW Stingray Behavior, FW Stingray Compatibility, FW Stingray Selection, FW Stingray Systems, FW Stingray Feeding, FW Stingray Disease,

stingray pups from different fathers?    12/26/12
Love your website! I can usually search and find what I'm looking for, but here's one I've come up empty on.
I've been keeping P. motoro and P. leopoldi stingrays for over 4 years.
They're doing well and I've had two litters of pups so far.
 I've read they have 2 uteruses; one on the left, one on the right. I know they can sometimes be pregnant only on one side.
Question 1: Do stingrays have to mate twice to get pregnant on both sides?
<Mmm, don't know>
Question 2: If so, does that mean you could have pups from one father on one side, and pups from a different father on the other side?
<Could be two (or more) males involved or just a repeat from the one>
I'd sure appreciate any information you can provide.
<It may be time for a trip to a large/college library (or online) searching for what biology you can find for the family Potamotrygonidae. Maybe have a read here: http://www.wetwebmedia.com/litsrchart.htm
and the linked Related FAQs file (above). Bob Fenner>
Re: stingray pups from different fathers?  12/25/12

Thanks for your reply. I'll follow up on this. Margie
<Ahh, please do write back re your findings. Cheers, BobF>
Re: stingray pups from different fathers? FW f'     3/28/13

Hi, I'm following up on a question you responded to last December ...
Apparently stingrays CAN have multiple fathers associated with a single litter. Wow.
<Yes; as stated previously>
I haven't yet been able to find out if it requires two matings for a stingray to become pregnant on both sides. I suspect it does.
Another question I'm looking into is the issue of whether or not stingrays can store sperm and become pregnant later.
I've found multiple sites that claim they can.
<Mmm, it is known that some teleost (advance bony) fishes can>
I have a lot of questions regarding these amazing fish! For instance, I haven't found much info. on how long they live and at what age they typically become too old to breed.
<This info. should be available from references listed for the family and species on Fishbase.org>
Thanks for listening.
<Thank you for sharing. Bob Fenner>

Motoro stingray    5/15/09
Hi. I sent a question a few months back asking about breeding Motoro stingrays ( spelled breeding, Breading )
<Mmm... breaded stingray!>
I now have a concern about something else. I had both stingrays a male approx 9" and a female approx 10" in a small 90 Gallon tank. (27" wide X 52" long and 18" deep approx) My problem was other than the size Too small.
The Male became to aggressive and chewed off the lower disk and fins of the female. I moved the Male into there to be new home a 250 gal tank 36" wide X 72" long and 30" deep. This tank has been cycled for 4 months and has two Fluval FX5 filters and one Aquaclear 500 filtering it. It has two Eheim 250W heater.
<Sounds good; do keep the heater protected with a "heater guard" though, or better yet, inside the sump. Stingrays easily burn themselves on glass heaters.>
With glass bead substrate. Very soft and non abrasive ( like tiny marbles)
<Never heard of this; can't say I like the sound of it all that much, so do check with other Stingray keepers that it is known to be safe. Even if it is smooth, the texture or colour may be off-putting. If all else fails, plain vanilla gravel works, as does smooth silica "silver" sand from garden centres. Neither of these costs much. Do observe all the usual rules when selecting, using substrates re: being lime-free, non-abrasive, thoroughly cleaned before use, and regularly cleaned once installed.>
With a large pc of bog wood for decor. I do a 30% -35% water change every 4-5 days. Last time I checked 2 days ago the ammonia, Nitrates and Nitrites where at 0ppm The PH Is 5.5 The temperature was 81 f But I
replaced a defective heater and it is now 76 f. The only fish in the tank are 2 angelfish, 3 SAE's and 20 Guppies.
The male Stingray has been in the tank for 30 days. He spends most of his time swimming against the glass near the surface of the water in the same spot. When I first put him in the tank he ate like a pig as usual. Silver sides, night crawlers, black worms, Ghost shrimp and sometimes grubs or crickets. But now he is eating very little and not so eager to eat. Just swimming in his spot or sitting on the bottom. Do you think he just needs more time acclimating to his new tank? or should I be more concerned about something else?
<With Stingrays, you should *always* be concerned when these fish don't behave normally. Put simply, behaviour is your first and only warning of problems; by the time symptoms of ill health appear, it's often too difficult (or impossible) to treat them. So yes, review water chemistry, water quality in particular, but also potential social issues such as the Siamese Algae Eaters "nibbling" on the Stingray and annoying it. Don't keep adding food while he isn't eating, but do try offering earthworms after 3-4 days of starving to see if he's ready to eat again. Do consider possible sources of toxins: paint fumes, cleaning agents, etc. Check water circulation throughout the tank is adequate: is the bottom layer of water being moved about? Or just the top? Does adding extra aeration make a
difference? Rays are super-sensitive to low oxygen concentration, which can be caused by poor circulation and excessive heat. Look for signs of decay in the tank: particularly organic debris stuck in the substrate. Perform a
large water change, controlling pH and hardness changes as much as possible.>
When he was in the small tank with the female he was doing better under poor tank conditions. Where the female is now flourishing and healing nicely. Getting bigger and fatter. Any suggestions would be helpful.
Thank you. Kevin
<These are difficult fish at the best of times. If water quality/chemistry are good, I'd be reviewing tankmates, diet, substrate, and sources of disturbance such as loud TV sets close to the aquarium. Cheers, Neale.>

Regarding Freshwater Stingrays' Babies.  7/15/08 Hello, Can you advise me as to how to take care of new born babies of PLE14? <I assume you mean Potamotrygon species P 14; I've never heard of 'PLE14' but I admit my knowledge of these animals is hardly encyclopaedic!> What kind of procedures should I follow? <Same as the adults, though removing the adults, particularly the male, is recommended.> I have almost a dozen of new born babies which came from the breeding of PLE10 and PLE14. When they were born, the babies seems to be in good conditions, however after a couple of days they started behaving weirdly. <Well done on getting the babies!> Some of them start having fin curl issues, some start leaking sticky substance from their bodies. <Ah, this is the tricky bit with all livebearers, whether Stingrays or Guppies -- getting the babies is easy, rearing them in good numbers is difficult.> Have checked the water ph (is around pH 7), changed the water gradually to get it slightly more acidic, temperature was normal (around 27 degrees Celsius), with filters and heaters. Everything seem to be in good condition. <I wouldn't mess with water chemistry. It doesn't matter much to Stingrays. What matters to them is water quality (ammonia, nitrite and nitrate) first and pH stability second. Changing the pH, even to a nominally optimal value, can stress them. Moreover, as with any freshwater fish, changing the pH without changing the hardness as well is pointless and likely to cause pH instability.> The adults rays were in the same pond but they don't have any issues, however the babies seems to be having a very tough time, in fact a few of them have already passed on. <For a start I'd concentrate on keeping water chemistry stable and water quality optimal. I'd be tempted to isolate the juveniles, and perhaps the females as well (the male Stingrays, like male Guppies, can be quite persistent re: mating, and in the process can stress, even damage, the females.> Please advise what should I do to prevent the others from becoming the same way. <Can you tell me a bit about the pond, i.e., capacity, pH, general/carbonate hardness? Do also review the substrate. While Stingrays definitely prefer sand on the bottom of the tank, there's some experience to suggest sand can trap dirt and/or bacteria and cause problems. While adults may be relatively resistant if the sand is kept clean, juveniles may be more sensitive. This is certainly the case with many other benthic fish, for example juvenile catfish.> Thank you very much. Regards, Qianling <Good luck, Neale.>

Re: Regarding Freshwater Stingrays' Babies. -- 07/16/08 Hi Neale, Thanks for the prompt reply! :) <You're welcome.> We have removed the babies from the main pond, to avoid adults having conflicts with them. <Good. Do also try and separate the female for a while, so she can "fatten up" a bit.> The ponds that we shifted the babies to is 4ft long 2 ft wide 2ft depth (6 in one and 5 in the other), the pond for adults is 18ft long 10ft wide 2ft depth (total 8 adults within it). <Sounds great.> There is no substrate at all, totally clear water. pH was around 7.2. <All good.> We did put in the pandan plant to minimise the ammonia, nitrite and nitrate issue. <Hmm... is it possible some pesticide spray came in with this plant? Also remember that things like ceramic plant pots can carry various residues into the aquarium too.> Temp is around 26.5 ~ 27 degree Celsius. <OK.> Adults pond have 1 big and 2 small filters. Babies ponds don't have filter at this moment. <Ah, this isn't going to work in the long term... or even the short term. I'd have at the very least a decent canister filter working here.> All ponds do not have heater as my country's (Singapore) climate is pretty warm unless there's storm in the night then perhaps the water temp might be slight cooler. <Sounds fine.> What other things should we take note of? <Nothing obviously remiss here, except the lack of filter on the pond with the juvenile fish. I'd perhaps check the nitrite/nitrate levels first, and then also consider whether the diet offered to the juveniles is sufficiently balanced. Do also consider extrinsic factors, e.g., pesticide sprays, paint fumes, cooking fumes. Use of activated charcoal to remove any potential toxins from the water might be worthwhile if these are suspected. Consider running tests for chlorine and copper, both of which are very toxic to Stingrays, and likely more so to juveniles than adults.> Please advise. <There's really not much more to say. Generally if Stingrays are happy, they breed. And if water conditions are good enough for breeding, the juveniles are comparatively easy to rear. You could separate off one or two of the youngsters to an aquarium where you can control water quality/chemistry more easily.> Thank you very much!! :) Regards, Qianling <Cheers, Neale.>
Re: Regarding Freshwater Stingrays' Babies.
7/17/2008 Hi Neale, Again Thank you!! :) <Most welcome.> Will inform my dad about all these issues that he has to take note of. He's still considered as a newbie in rearing stingrays though he does have a few more experience people with him however they seem totally unsure what to do about the babies. <Very good. The thing is to experiment. Healthy fish will produce many batches of babies, so you can test out different ideas each time until you find a system that works for you.> You have been a fascinating help!! :) Last question that got me seriously curious about these rays.. <Yes?> How does one feed them one by one? using hand? or those stick like thing to put the food in? Won't they be uncomfortable with the stick like thing? <Simply placing live foods at the bottom of the aquarium should be enough to get the juveniles feeding. Bloodworms and other small invertebrates would be the ideal. Small earthworms seem to be especially favoured by Stingrays (and indeed fish generally!). Frozen foods may work too. Surprisingly perhaps, I find using forceps or other tools to hand feed fish works rather well. Fish seem to accept an inanimate object much more readily than me sticking my arm into the tank.> Oops another... Can the babies eat what the adults are eating? <Pretty much the same stuff, but smaller in size of course.> Thank you very much!! :) Regards, Qianling <You are welcome! Good luck, and how about some photos? Cheers, Neale.>

Stingray question, FW, ID, sexing...   5/22/07 Hello <Morrow> I was wondering if I would be able to send you a couple of pictures. <Certainly> I purchased a teacup stingray from a local pet store, which I believe to be a motoro. Wondering if you could confirm. I also think "it" is a girl, but would like to know for certain    :) <Sure... just send a few pix showing the underside...> I really enjoyed reading your article on wetweb media and have bookmarked it for future reference. Have a wonderful day  ;) Stefanie <You as well. Bob Fenner>
Re: stingray question, ID, sex   5/22/07 Thank you very much. <Welcome> Here are the pictures. Let me know if you need more. <Thank you... this is a female... and... though I can't be sure, appears to be a Potamotrygon reticulata... now synonymized with P. orbignyi... though the one pic (dorsally) almost appears to be P. marinae (only found in Fr. Guyana...). BobF>      Stefanie

Good substrate choice and useful ceramic plate/feeding station

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