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Re: North American Killies
> Has anyone tried inducing spawning in these native killies by playing
> with photoperiod? Simulating winter's short days would be easier than
> chilling them.
Al Castro once suggested that photo period was important in spawning
pupfishes. Someone else (Dan Fromm?) advised lengthening the daylight period
even for Central American Rivulus - which are not that many degrees from the
equator. While that really doesn't answer your question, you have touched
upon a factor which can be, should be, included in one's bag of tricks for
The pupfish (when we had them in the 70's) almost never spawned until we put
salt or Rift Lake salts into their tanks. Raising their temperatures above
80 degrees F (pardon me 27 C) was also essential.
Nothing beats disciplined water changes and militant feeding of live foods
(or so I'm told).
If one keeps plants in their tanks and can set the light timers for 14
hours/day that issue is pretty much addressed. The plants grow better... and
I still get a chance to see the killies after the other important stuff of
the day it done.
All the best!
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