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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 spawning.
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,
Jim

> 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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