RE: Lets be careful
Andrew Boyd (andrew at pcug.org.au)
Mon, 27 May 1996 19:46:07 +1000
At 09:09 AM 5/25/96 -0700, Peter Unmack wrote:
>On Sat, 25 May 1996, Andrew Boyd wrote:
>
>> Just on this "local waterways" point - here (Canberra ACT) our water
>> temperature at the moment isn't a lot above freezing - it might be 5 or 10
>> degrees Celsius at the surface during the day, the point is moot as far as
>> tropical fish species are concerned - they'd die in fairly short order
>> anyway. So in our local waterways introduction of tropical species, to
>> become feral pests, is not an issue.
>
>> I acknowledge that feral aquarium species are a problem in other parts of
>> Australia.
>
>So does that mean that you don't think weather loaches are a problem in
>your area? How frequently do you think goldfish get released? The main
>reason you see it being a problem elsewhere is because there are
>relatively few aquarium species that are cold tolerant. However, desert
>rainbows would probably do ok. I've had them down to about 3oC
>overnight. There are also usually some refuges from this degree of cold
>in lakes. Empire gudgeons would probably do fine too. There are a whole
>bunch of species that could do ok in Canberra. Don't be complacent.
Peter - please note my use of the word "tropical" - I'd define it (just
personally, mind) as fish that need a water temperature of 16 degrees C plus.
Goldfish and Weather Loaches are feral in a big way here, as well as (I
think I mentioned them before) Carp, Dambusia, Redfin, Trout, and some
translocated Natives as well (did I leave anything out?). Just no
"tropical" species *here*. Not even tatei!
Regards, Andrew
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Andrew Boyd - andrew at pcug.org.au - http://www.pcug.org.au/~andrew
Evolution takes no prisoners....
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