brisbane aquarium society scuba/snorkelling and collecting gear pages

Discussion in 'General Discussions and Advice' started by pkc, 17 Aug 2009.

  1. pkc

    pkc

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  3. jacquesb

    jacquesb Retired Moderator

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    Thanks for sharing PKC. Really nice spots. It seems that the diving spots are really easy to get to, from terra firma? Or is it just the pics that looks that way?
     
  4. pkc

    pkc Thread Starter

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    thats true

    There are quite a few spots along this part of the coast where you can drive park and dive,very convenient!!!
     
  5. jacquesb

    jacquesb Retired Moderator

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    Eish - well - that's one thing we have a HUGE shortage of here in SA - easy entry point for shore based diving...... :(
     
  6. pkc

    pkc Thread Starter

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    shore dives

    here is very good,but mid to northern NSW is far better,its just to cold during winter for tropical species to survive it though,shame!
     
  7. jacquesb

    jacquesb Retired Moderator

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    How cold, PKC? What temperature ranges do you have to contend with (sea water temps)?
     
  8. pkc

    pkc Thread Starter

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    temps

    Up until 4 years ago,the coldest in winter around here was an average of 16 degrees in the surface water(down to 60 feet),each year it has crept up,now this winter it didn't get (over all) below 19 degrees,the warming of the ocean around here seems to be going un noticed for some reason.
    Every year for around thirty years that we have dived here in Queensland(nearly every weekend,sometimes 4 dives a day)it has always gotten to 14 to 16 degrees,i have ear operations to prove it.
    There has been no comment from the diving groups that use our waters,maybe it will have to be a very dramatic fast change for them to actualy notice.
    But a solid 2 degree difference over 4 years,that seems huge to me and the fish life out here has changed so much and the corals are bleacing more than ever.

    In northern to mid NSW it normally gets down to 12 to 14 degrees in winter.more so 14 to 15 degrees in northern NSW.

    I haven't dived consistantly down there for over 20 years,but two guys we know that do say it seems the same as always down there.

    If things keep going the way they are,just at a guess i would say our waters are going to have some of the largest fish stocks increases around as they are already, along with the shark numbers getting out of hand as well,but the invert life on some levels is changing very quickly,no one really notices that??

    Two things that any fool should be able to see that are coming from these changes that are happening are the dugongs are dropping dead,in huge numbers,no injuries,just dead and some small polyp varieties of acropora are becoming live rock after there bleaching in huge numbers.

    They will find soon that the toxic algae that grows upon the sea grass may be harming the dugongs,now that in the recent past was not there in the current forms in the eastern side of the bay and the avaliable algae larvae and even algae adults that the corals include in the their clades(Symbiodinium Microadriaticum) that was constant in the best species,these two things on their own it appears are wiping out our dugongs and some of the prettier corals.

    Just in the last 4 years three places we go to that had red staghorn corals all bleached in 3 year period in waters averaging no more than 10 feet of water and that one species along with many others around here has not come back.

    By the looks of things some of the shallow water old faithful species are going be history around here,including our dugongs and turtles.
     
    Last edited: 23 Aug 2009
  9. Nemos Janitor

    Nemos Janitor

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    Are you guys taking frags and propagating them so that they do not become extinct and someday may be reintroduced from whence they came? The acro that is.
     
  10. pkc

    pkc Thread Starter

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    what?

    No,lol, once it is gone,thats it,but that is only here, there will be somewhere it is hanging in there.
     
  11. riyadhessa

    riyadhessa

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    That is so sad...
     
  12. jacquesb

    jacquesb Retired Moderator

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    Many thanks for the awesome explanation on the water temps, PKC.

    It seems that the water temps used to be very similar to what we have here in the southern area of our coastline (the region is generically called "The Garden Route".
    It is the colder part of the Indian Ocean.

    This area's water temperatures vary between about 16/17 degrees Centigrade in Winter time, to about 22 degrees in Summer time.

    On the "west coast" of South Africa, we have the Atlantic Ocean, and the winter water temps are around 14 to 17 degrees (funny it is always much warmer in winter time, than in summer time), and in the summer the water temps goes down to as low as 8 degrees celsius.

    I am just amazed at the coral life the lives and survives in those water temperatures..... (in your dive sites)....
     
  13. pkc

    pkc Thread Starter

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    no worries

    Thanks for that info,as well.

    It has always amazed me that in the recent past the corals and masses of clams here did well down to 14 degrees and in summer sometimes up to 32 degrees celsius and the fish didn't survive the cold.
    It makes sense that the fish get stressed and die in the cold,but you would think the inverts would go down as well,but all that happens is there reproduction waits for warmer times.
    The life forms that are going down as a result of the slightly warmer waters here is understandable with the run off from us combined with longer blooms of toxic algaes.

    The poor young and old turtles with the discusting bacterial growths on them that kill them from our waste(sewerage outlets)is sad,we found a young dead one three months back on a low tide collecting trip,they look like warts on warts,yuk.

    We report them,but i don't think anyone comes out,most of the carcass was still there a week later.
     
  14. jacquesb

    jacquesb Retired Moderator

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    Eish - that is really sad - the sea turtle babies that you find dead - with the growths on them!
     
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