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Thread: Fishing Management at Zandvlei...

  1. #201
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    I'm getting reports of dead or dying fish in Marina Da Gama at Zandvlei since Saturday. Waiting on feedback from the reserve. This does not look good.
    So Long, and Thanks for All the Fish.

  2. #202
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    Quote Originally Posted by BuzzLiteBeer View Post
    I'm getting reports of dead or dying fish in Marina Da Gama at Zandvlei since Saturday. Waiting on feedback from the reserve. This does not look good.
    Two Oceans Aquarium have kindly offered to conduct an autopsy on carp specimens to try determine if the carp die off is disease related. At the moment there are only dead carp which is usual after spawning events. The numbers of dead fish however are not normal and could be related to some other factor. No other fish species are being affected.
    We have already conducted Dissolved Oxygen readings at points around Zandvlei and these are satisfactory. We will be checking salinity in the vlei today to see if this is a contributing factor.

    Dalton Gibbs.
    Last edited by BuzzLiteBeer; 17-12-14 at 10:12 AM.
    So Long, and Thanks for All the Fish.

  3. #203
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    Fish deaths were apparently concentrated in canal in Uitsig area - someone who knows the 'Vlei well speculated that load shedding may have lead to a problem with sewage processing / pumping (there is a pumping station near the canal). Were DO readings done in the canal? Potentially the pollution / toxic conditions did not prevail for long in the canal but given the restricted volume of water present could have caused deaths and then been pushed into the Vlei by the inflow. To kill big carp it must have been pretty bad though...

  4. #204
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    Quote Originally Posted by allsorts View Post
    Fish deaths were apparently concentrated in canal in Uitsig area - someone who knows the 'Vlei well speculated that load shedding may have lead to a problem with sewage processing / pumping (there is a pumping station near the canal). Were DO readings done in the canal? Potentially the pollution / toxic conditions did not prevail for long in the canal but given the restricted volume of water present could have caused deaths and then been pushed into the Vlei by the inflow. To kill big carp it must have been pretty bad though...
    That pumping station has backup generators and no spills have been reported. A few dead carp have been reported at Rutter Road as well.
    So Long, and Thanks for All the Fish.

  5. #205
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    From Nature Conservation.
    Salinity readings taken yesterday are very low <1/1000 and will not be a factor for carp. Dead specimens taken to Two Oceans Aquarium for autopsy were inconclusive. New fresh (living – sick) specimens were taken through again today and are being dissected now. There are only dead carp being recorded.
    So Long, and Thanks for All the Fish.

  6. #206
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    Quote Originally Posted by BuzzLiteBeer View Post
    From Nature Conservation.
    Salinity readings taken yesterday are very low <1/1000 and will not be a factor for carp. Dead specimens taken to Two Oceans Aquarium for autopsy were inconclusive. New fresh (living – sick) specimens were taken through again today and are being dissected now. There are only dead carp being recorded.
    Maybe they were caught, photographed lying on the grass, and then returned?

  7. #207
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    Quote Originally Posted by NeilRowe View Post
    Maybe they were caught, photographed lying on the grass, and then returned?
    Splutter, koff, koff ... (Wipes coffee off screen)
    So Long, and Thanks for All the Fish.

  8. #208
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    Quote Originally Posted by NeilRowe View Post
    Maybe they were caught, photographed lying on the grass, and then returned?
    I think you just won the internet today!!!
    *** TO RIDE, SHOOT STRAIGHT AND SPEAK THE TRUTH ***

    Some people are like Slinkies.... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.

    The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over. - Hunter S. Thompson

  9. #209
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    We have had feedback from Georgina the vet from the Two Oceans Aquarium who has very kindly assisted us in trying to get to the bottom of the carp deaths. She has not yet confirmed (this will take a few more days and some funding from us, as well as the assistance of a private lab), but she suspects that it is the Koi Herpes Virus. This would explain why only carp have been affected.

    This may have been caused by an introduced specimen, but many populations of carp carry the virus anyway. Sometimes when the fish are stressed, particularly post spawn, or in water warmer than 25 degrees Celsius, the disease manifests.

    Joshua Gericke
    Bsc Hons Environmental Management
    Reserve Manager
    Zandvlei Estuary Nature Reserve
    Coniston Avenue, Retreat 7945
    Tel : 021 701 7542
    Fax: 086 576 2480
    Email : Joshua.Gericke@capetown.gov.za
    So Long, and Thanks for All the Fish.

  10. #210
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    Thanks for the info Garnett..... Did she say if the virus manifests itself in any visible way on the fish with sores/legions or anything like that?
    I was there on Saturday, and saw all the dead fish, and did notice some legions etc on some of the live fish....
    *** TO RIDE, SHOOT STRAIGHT AND SPEAK THE TRUTH ***

    Some people are like Slinkies.... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.

    The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over. - Hunter S. Thompson

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