Re: NANFA-L-- Fw: NAS Species Alert - Piaractus brachypomus

Subject: Re: NANFA-L-- Fw: NAS Species Alert - Piaractus brachypomus
Date: Thu Nov 04 2004 - 06:37:56 CST

In a message dated 11/3/04 11:29:52 PM, writes:

<< Occasional air temps of freezing don't necessarily mean low water temps.
found through experiments that pacu die-in-constant water temps of 55 degrees
and below. Even-in-slightly higher temps they become way to lethargic to
survive among active fish. Where in the US does the water temps never fall
55 degrees? Even here where I live we get winters where it seldom frosts but
the water temps fall into the low 40's to mid 30's and stay there for weeks.

I don't know the temperature of the water where the Pacu are found in Uruguay
but where I collected killifish this past July, in Uruguay, the water
temperature was as low as 40 degrees. These were shallow pasture ponds, whereas I am
sure the Pacu are found in larger rivers. I did not measure the water
temperature in any of them. Just a caution that some species of Pacu may be more cold
tolerant than others species.
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: Fri Dec 31 2004 - 12:42:45 CST