[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Killietalk] Cold water killies
Rusty rscalf at jps_net wrote:
Might there be a distinction between truly cool or cold water fish, and those that tolerate cooler temperatures during winter? A species like Jordanella floridae would have to tolerate cool temperatures during cold snaps in Florida; Doesn't mean they thrive in continuously cool water.
How are cool/cold water killies defined?
There's no one answer to that one, Rusty. Some shallow-puddle killies
have adapted to take wide, sudden changes in temp., while big-water fish
like *lamprichthys* like it rather constant.
The fishes of the Gabon highlands live in year-around even-temperature
cool waters, while coastal fishes of either Africa or SA tend to suffer
more heat and are often less cold tolerant. My BIV Funge refused to even
make eggs at below about 78F, which was more than warm enough to stop my
Diapterons from reproducing. Both are from the same part of the world,
right on the equator, but from different elevations.
Some rules of thumb I have tended to follow are that equatorial fishes
tend to want more constant conditions, while temperate zone or
sub-tropicals like and may even need more cyclic temperatures on either
a daily or seasonal basis. Many of our NA natives won't spawn unless
they have had a "cold" cycle that emulates their winter.
Like pH and hardness, it is best if you can get good info on the
specific species from someone who has had success with them. [I have
concluded that the best general rule is that there are no general rules.
Wright Huntley - Rt. 001 Box K36, Bishop CA 93514 - whuntley at verizon_net
...[T]he purpose and power of government is rightfully limited to
protecting our natural God-given rights. The idea that government
doesn't grant rights is offensive to those who wish to control our lives.
-- Walter Williams
To join the AKA see http://www.aka.org/pages/join.html
Archives are at http://fins.actwin.com/killietalk/