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+--- Thread: Rondegat River (/thread-5540.html)
Rondegat River - SABAA - 01-25-2012
Just for information - copied from an email forwarded to me by the Western Division, SABAA
"This email is to confirm that we will treat the Rondegat River on 28 Feb with rotenone, with the treatment lasting about 6 hours and starting at 06h00. It would be great if a senior bass officials can attend the treatment, to show that this is a project that has the support of WPBAA. Also you may find it interesting to observe how we do the treatment which will be supervised by an American expert Dr Finlayson.
Dr Martine Jordaan is managing the Fish Rescue Plan which includes rescuing smallmouth bass. As mentioned in our meeting last year, you stated that WPBAA were eager to assist in this. Martine will contact your organisation about this shortly.
regards
Dean Impson
Scientist: Freshwater Fishes | Scientific Services"
- Jeremy - 01-25-2012
Thanks for the info. Do you know what their objective is. Rotenone is used for the eradication of fish. What are they targeting or do they want the eradication of all fish and then start from scratch.
- Bergie - 01-25-2012
How far up the river is this happening???.....Any GPS positioning so as this can be plotted on google as to the exact location or is this a "random" chosen area? And could Sabaa please let us know whom from WPBAA will be attending....
Also, I disagree with this happening as it kills all fish.
Also who owns the right's to import this Rotenone?????
- smurf - 01-25-2012
Can we bring our filletting knives... :blue-biggrin: KIDDING,only KIDDING :blue-lol:
- BuzzLiteBeer - 01-25-2012
Jeremy Wrote:Thanks for the info. Do you know what their objective is. Rotenone is used for the eradication of fish. What are they targeting or do they want the eradication of all fish and then start from scratch.
The original aim was to wipe out all fish and re-establish viable Clanwilliam Yellowfish breeding stock.
- Bergie - 01-25-2012
Thats what i'm afraid of.....cos I heard years ago that this was gonna happen at Clan and would have an adverse effect on the Bass fishing as well as the local populations commerce if the fishing was affected......
- Bergie - 01-25-2012
According to "Science Daily" (Feb 2011)...."Rotenone is linked to Parkinson's Disease"........"People who use the pesticide, developed Parkinson's Disease approximately 2.5 times more often than non-users".....
Nice one to think about, as the waters treated with Rotenone is drank by the locals.... :blue-rolleyes: :blue-shock:
- BoatWrapperVincent - 01-25-2012
WHAT THE .... IS HAPPENING !!!? (yes that is shouting) :blue-shock:
Someone please explain !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
- smurf - 01-25-2012
Doing this inlet will not have too much of an effect on the main lake,but it could affect some resident bass in Rondegaat.It would be good to have some people there with the Department to support their cause of trying to clear the small river of smallmouth and allow us to gather the bass and locate them either to Clanwilliam Dam or,if a permit can be drawn up,into Voelvlei.
- Riprap - 01-25-2012
STOP PRESS: This week has been declared National controversy week. Cause as much … as you can!
- BoatWrapperVincent - 01-25-2012
I'll help to conserve - and can think of at least 3-5others that arent even on BFSA who will also help!!!
Call me 082 875 3023
- LaRocks - 01-25-2012
Newsletter that I found on web about topic.
In the Rondegat River, rotenone treatment is scheduled to commence during February, 2011. The other chosen sites that will follow thereafter are, Krom River (Eastern Cape) and Suurvlei (Cedarberg).
Weyl adds: “Whilst alien fish removal by rotenone has been demonstrated to be an effective management tool, it has also been surrounded by controversy owing to both known and unknown impacts on various aquatic organisms”.
The main source of controversy has been the highly variable impact of rotenone on communities of invertebrates. These impacts can range from minimal to severe, making it difficult to draw broad conclusions about the danger being posed to the aquatic environment.
Rotenone has been used to remove invasive fish from reservoirs and streams in the United States, Britain, Australia and New Zealand. In all of these cases, alien fishes were successfully eradicated from the treated water body. In one case, native fish were successfully re-introduced to a treated reservoir after the removal of the alien fishes.
In South Africa, concerns were raised during the public consultation phase of the comprehensive EIA carried out in connection with proposed alien fish eradication in the rivers of the CFR. Concerns, for the most part, have been fuelled by the lack of knowledge of rotenone effects on South African rivers.
This knowledge gap underlines the need to assess the pros and cons of rotenone by accurately quantifying treatment effects on non-target organisms, along the way to deciding whether or not rotenone use is a feasible and environmentally-sound fish conservation tool for South Africa.
The current WRC study has been approved by relevant conservation authorities and is aimed at addressing this knowledge gap. The Rondegat River rehabilitation pilot study represents an important opportunity to meet the need for quantifying the impacts of rotenone treatment, as a river rehabilitation method, on a suitably wide range of native aquatic organisms.
Successful river rehabilitation will depend, firstly, on the ability of rotenone to completely eradicate alien fish species, and, secondly, on the ability of invertebrates, native fish and frogs to re-colonise the river after treatment.
For more information contact: Bonani Madikizela, Research Manager: Water-Linked Ecosystems Tel: 012 330 9021 E-mail: <!-- e --><a href="mailto:bonanim@wrc.org.za">bonanim@wrc.org.za</a><!-- e -->
- Jeremy - 01-25-2012
LaRocks Wrote:In one case, native fish were successfully re-introduced to a treated reservoir after the removal of the alien fishes.
I hope this doesn't mean it has only been successful once.
As long as they keep it away from KZN. We have enough pollution in out rivers that need addressing first before we add more poison to the brew.
- Bergie - 01-25-2012
I have been assured by my good friend Craig Fraiser, via Cape Nature Conservation, that the Rotenone will only be used above the weir section of the Rondegat river..... As there is no influx of water into clan proper at present and water levels are low it was decided to choose this as the most appropriate time for Cape Natures Purpose.. There will be a few fish affected and will be used for "Scientific Purposes"....This is only natural and according to reports I read this afternoon, if handled correctly will be of benefit in local rivers.
Within twenty four (24) hours the Rotenone will have dissipated, and even if there was a deluge of water thereafter into the main dam, no fish will be effected.
Thank you Craig.
- BoatWrapperVincent - 01-25-2012
ok but are there smallies in there?
lets make a trip and go catch them and relocate them to .... THEEWATERS? :blue-idea: