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  1. #1
    Leopoldi Ray rayman's Avatar
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    Breeding of the Raspy river stingray Potamotrygon scobina

    Breeding of the Raspy river stingray Potamotrygon scobina

    Potamotrygon scobina is one of the smaller freshwater stingrays, size ranging from 10" to 20" (25 - 50 cm) diskwidth depending on origin. The habitat of this species is from Manaus downstream in the Amazon and Pará and their tributaries. The origin of the small morph that I have breed is Rio Xingú and this variant reaches only 10" to 14" (25 - 35 cm) diskwidth (the rays from Xingu are now called orbignyi variant by scientist). These are very active rays and it is fantastic to observe them cruising through the tank.

    Video scobina male cruising through the tank

    This species prefers a water temperature in the range of 81 - 86°F (27 – 30°C) and is very sensitive against nitrite (NO2). If the nitrite level exceed 0.025 ppm these rays do not eat well. So a well cycled large biofilter is needed, I use Siporax as filter media. My breeding pair, (male 10.4" (26 cm) and female 12" (30 cm) diskwidth) houses in a 80" x 24" x 24" (200 x 60 x 60 cm) tank; water change is 40% per week. The tap water is treated with activated charcoal before use.

    My water parameters are:
    Temperature 81 - 86°F (27 – 30°C)
    pH 7.6
    NO3 < 30 ppm
    hardness 180 ppm CaCO3
    conductivity 460 µS/cm

    P. scobina has a relative small mouth, so I cut larger food items in smaller pieces. My pair feeds on bloodworms, Canadian nightcrawler, fish, mussel, shrimp and krill. I feed the adult rays once per day. First food for new imported P. scobina should be live food as nightcrawler or fresh dead fish. My P. scobina only hunt very small fishes like cardinal tetra. Sometimes it takes some weeks until they accept a new kind of food.
    If well fed these rays mature at an age of 18 months. For breeding attempts it is best to use a female that is larger than the male to avoid damages during the mating process. Mating and birth occurs mostly at night.

    Mating season starts, the male bites the female

    They swimm together, the male bite the female during the whole mating process

    They mate at the ground, male upside down.

    Video mating 1

    Video mating 2

    Young female with injuries from the male. They were together for a long time and nothing happened, then overnight this. I seperate her immediately and she recovered.

    Pregnant female, 5 weeks after mating the first movement of the embryo can be observed

    Video Movement of embryo

    Pregnancy last for 90–120 days, litter size is 1–4, the diskwidth of the pups is 2.8" to 4" (7–10 cm). During the pregnancy the female need more food than usual, because freshwater stingrays are matrotrophic vivipar, that means they are livebearer and the female provides additional nourishment to the embryos. This happens via secretion of so called “uterine milk” through trophonemata (long filaments from the uterus wall which secrete a nutritive fluid).

    P. scobina give birth

    Immediately after birth the male want to mate, bottom left a newborn pup

    Female with pup

    The day after birth I separate the pups in a smaller tank. This tank is in the same circulation system as the main tank (same filtration system), so the water conditions are exactly the same as in the main tank.
    The pups start to feed 1-3 days after birth, I feed them blood worms 3 times per day. Most time of the day they are buried in the sand, at night they are more active.

    Scobina pups feed on bloodworms

    Video young scobinas hunt live food

    They grow with a rate of approximately 1 cm per month. One of my captive breed females reached sexuell maturity at a age of 18 months and a size of 10" (25 cm) diskwidth, one male matured with only 8" (20 cm) diskwidth.

    Bunch of pups age six months

    Mature captive breed scobina female two years old

    btw. in 2006 I sold all my scobina to start a new adventure, breeding Itaituba rays. But that will be another story.
    Andreas from Germany

    Website (translation with Google): My tank and rays
    Breeding of Potamotrygon scobina

  2. #2
    Smallmouth Bass
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    Feb 2006
    Where there is sunshine
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    06-11-2009 7:53 PM
    excellent pictures bro! congrats!!
    1) 60 gal mixed reef
    2) 20 gal saltwater: QT tank (Salt Water)
    3) 240Gal: Freshwater: 1 X 8" SilverArowana, 2 X 8" Silver Dollars, 1 X 8" Rhino Pleco, 1 X 8" fw flounder, 1X4" Musk turtle

  3. #3
    Arapaima Loubard's Avatar
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    Today 8:57 AM
    I have red this on your site earlyer, but it's still a great read.
    This space is for rent

  4. #4
    Thanks for sharing this! Good luck on the Itaituba adventure, btw.
    1 Leopoldi x Pearl (Leland)
    6 Motoro (Mox, Midori, Milo, Malcolm, Magdalena, Alice)
    2 Scobina (Simon, Sophie)
    3 Marbled Motoro x Mantilla (Miles, Molly, Mogwai)
    3 Hystrix (Hedgeman, Howie, Hubert)
    1 Marbled Motoro (Monroe)

  5. #5
    Great Barracuda hbluehunter's Avatar
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    Lynnwood, Wa.
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    Today 11:54 AM
    Awesome thread and great pics of the whole process..
    "Some people spend an entire lifetime wondering if they made a difference in the world. But the U.S. ARMED FORCES don't have that problem." ...Ronald Reagan

    Typically, on most occasions, I don't dip my junk into my aquariums, or others aquariums. I think i'm safe.
    R.I.P. Joey (R1_Ridah) 10.14.72-01.26.12

  6. #6
    Managuense Kamisan's Avatar
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    10-04-2009 10:00 AM
    Informative thread. Thanks for sharing rayman.

  7. #7
    Wels Catfish Nic's Avatar
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    outside philly
    Quote Originally Posted by Kamisan;2610709;
    Informative thread. Thanks for sharing rayman.

    ]v[onster Fish Keepers East Coast Tribe Monster Movement

    i just keep proving my theory correct more and more everyday

  8. #8
    Arapaima FishDog's Avatar
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    B.G. KY
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    04-23-2015 12:40 PM
    submissive ray porn! Very nice photos

  9. #9
    Peacock Bass edotero's Avatar
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    12-13-2014 9:48 AM
    Very nice....

  10. #10
    Wels Catfish keepinfish's Avatar
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    Jun 2007
    In God We Trust
    that was awesome, i want scobina now...

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