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Re: GAR breeding and Barometric Pressures
Over the years I would tend to agree that the pressure does not effect most
types of killifish on a day to day basis but a series of changes over a
period of a couple of weeks can make some of the elegans start spawning
without the water changes.
Your study would interest me if you could also try temperature changes
without the water changes for I feel that this will also start a lot of
different killifish to spawn.
The Barometric pressure does affect the spawning of cory cats however.
killiman at indy_net
317 253 2170
317 466 1615 FAX
----- Original Message -----
From: "Jim Atchison" <jim at atchison_com>
To: <KillieTalk at aka_org>
Sent: Sunday, June 25, 2000 4:08 PM
Subject: Re: GAR breeding and Barometric Pressures
> Last year, during the height of the storm season and through a number of
major barometric pressure ups and downs (over a 61 day period), we
collected, counted, and logged over 8000 eggs from 8 different species of
Killifish (20 pair in total). The results of the quick study casts some
serious doubts regarding this notion of barometric pressure triggering
> What we did find was that with little doubt, water changes did have a
profound effect on the production from the fish...*gardneri* and others. It
would seem that the pressure may be a "lead indicator" of environmental
changes to come...fresh water, cooler water, warmer water, food choices,
more current, raising water (on and on).
> The results of this particular exersize and another conducted the year
prior led us to believe that the three areas that seemed to produce the
highest production were:
> 1. Feeding live blackworms daily (over fruit flies, Grindal worms,
microworms and brine shrimp...we did not use blood worms nor mosquito larvae
as our sources could not support the amount of material needed for the size
of the study groups).
> 2. Water changes every fourth day.
> 3. Daily egg harvest as opposed to weekly.
> We stopped the study on the barometric pressure because the results were
rather conclusive. The pressure changes had little effect on the production
of the eggs.
> ...and personally, I got really tired explaining the seemingly permanent
yellow stains on my fingers from dipping them in the Acriflavin stained
water during the collection process.
> Take care,
> > Date: Sat, 24 Jun 2000 17:14:27 -0500
> > From: "Bob Meyer" <bmeyer at parkland_cc.il.us>
> > Subject: Re: Gardneri Breeding
> > <<snip>>
> > My most important stimulus in breeding is barometric pressure. The fish
breed right before or after a rainstorm.
> > <<snip>>
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