Re: Hatching Brine Shrimp

[Randy Carey <carey@spacestar.net>]

I'm interested to hear if there are any more aquarists who are experiencing a
drop in bbs hatching.  With my past two cans, I certainly have seen a severe drop
even though I'm not really doing anything differently.  I used to have a cloud of
orange in 20 hours.  Now I'm getting mostly a bed of unhatched eggs on the bottom
with a small amount of of bbs hovering just above those unhatched cysts. I have
to work harder at harvesting just to get enough bbs for my fry tanks.  So I'm
raising the heat and going 36 to 42 hours -- the results are better, but nothing
near what I was getting.

I suppose that I've just have gotten a couple of bad/old cans.  I'm hoping this
won't be a trend in the quality of eggs that are going out.  I don't like paying
$60 a can, but right now that sounds like a deal if I can get the type of hatches
that I once got.

So please report if you start finding a significant drop in hatches as you break
into new cans.

--Randy



jonathan wrote:

> Hi gang! I am having terrible hatch rates with Brine Shrimp cysts (Artemia
> spp.). I am using a heater keeping the hatchery at about 75 F, I used 50%
> seawater and 50% freshwater to achieve a specific gravity of 1.014 (as
> recommended by the package instructions). I use airstones for circulation
> and aeration. I can only guess that the salinity is inappropriate. I used
> to hatch brine shrimp with great success years ago. I seem to remember
> using something like a tablespoon (3 teaspoons) of salt per gallon (1.004
> specific gravity). What salinity level (ppm)/ specific gravity/ teaspoons
> or tablespoons of salt per gallon has been successful for you fellow
> aquarists?
>
> Kind regards,
> Jonathan
>
> -------------------------------------------
> Jonathan Fung... Reef Geek
> Dalhousie University Honours Marine Biology
> Aqua Creations Inc. Assistant Manager
> writer for Marine Fish Monthly
> -------------------------------------------
>
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