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Thread: Lower Orange report back

  1. #471
    Join Date
    Jan 2007
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    Cape Town
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    9,074

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    Quote Originally Posted by bulkcarrier View Post
    Also the thing that we saw on our last trip was the green pond scum/algae. Def more runoff from the grape farms on the nam side.

    Rapids and faster water areas looked good but we saw green floating islands in the slower water areas.

    Was a bit shocking.

    https://photos.app.goo.gl/nFtwG5qKBhG9wQi93

    https://photos.app.goo.gl/YRE4hHuOFhIH6TJv1
    The green scum algae is water grass, it is not the Old Mans beard algae they get in the Vaal.

    But there are certain things to take into consideration.
    a. this water grass is very good for the system, it puts oxygen into the water.
    b. provides food and shelter for insects.
    c. takes out nutrients out of the water, cleaning the water, as it needs this to grow.
    d. fertilizer is not a big problem, modern farming, especially these along the Orange, where irrigation is used to give the fertilizer is an EXACT science. The soil has been analized, and the farmer will know exactly how much to put into the water for optimum growth for his grapes etc. To much is useless, and fertilizer is so expensive there is no use to waste money. And the rain is so little the soil has little chance to be leeched out. The days of giving to much fertilizer is long gone.
    Korrie Broos

    Don't go knocking on Death's door, ring the bell and run like hell. He hates it. (anon)
    Nymphing, adds depth to your fly fishing.
    Nymphing, is fly fishing in another dimension

  2. #472
    Join Date
    Sep 2014
    Location
    Western Cape
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    34

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    Grass is fine and it changes everytime we get to the river. This is the first trip we had found some bright green hair/scum algea growing on some rocks and floating ontop of the river grass.

    Sent from my Nexus 6P using Tapatalk

  3. #473
    Join Date
    May 2016
    Location
    Western Cape
    Posts
    3

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    I am not sure if this pic presents a bit of a better perspective with regards to the green scum we found in most of the slower sections. Ordinarily we would have taken a dip in this area but because of all the green bubbled algea scum, we opted to find an alternative spot.

    https://photos.app.goo.gl/jlMsIICkoTw068rB3

    What was interesting was seeing / watching a Tilapia who opted to nest in the algea found in a shallow pool, do the necessary "nest" keeping.

  4. #474
    Join Date
    Jan 2007
    Location
    Cape Town
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    9,074

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    Quote Originally Posted by mousedog View Post
    I am not sure if this pic presents a bit of a better perspective with regards to the green scum we found in most of the slower sections. Ordinarily we would have taken a dip in this area but because of all the green bubbled algea scum, we opted to find an alternative spot.

    https://photos.app.goo.gl/jlMsIICkoTw068rB3

    What was interesting was seeing / watching a Tilapia who opted to nest in the algea found in a shallow pool, do the necessary "nest" keeping.
    Yes, there are areas with the algae. Sometimes had it washed onto our baitlines as well, Very though stuff to get off
    Korrie Broos

    Don't go knocking on Death's door, ring the bell and run like hell. He hates it. (anon)
    Nymphing, adds depth to your fly fishing.
    Nymphing, is fly fishing in another dimension

  5. #475
    Join Date
    Aug 2016
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    Nationwide
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    26

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    Seeing all the grass in the water just confirms that Grass carp are not yet present in the Lower Orange.
    This pest is a concern on the Vaal River being present from Douglas to Standerton. I have not recently been on the Vaal above Standerton so not sure if they have got around the Grootdraai dam wall yet.

    Waters are devoid of most water grass where they are present. This reduces insect reproduction and areas that provide cover for damsels and other aquatic invertebrates. They are a real threat to our fresh waters and should be the focus of the DWAF and not trout.

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