Re: Hatching Brine Shrimp

[Mike & Diane Wise <apistowise@bewellnet.com>]

Randy,

I bought an "off brand" can of eggs and got terrible results. I went back to OSI and
got good results again, but I think not as good as in years past. I know that Utah's
Great Salt Lake has become less saline in recent years due to increased freshwater
inflow for surrounding rivers. The lake has risen about a meter or so. Maybe the
decrease in salinity affects the viability of the eggs.

Mike Wise

Randy Carey wrote:

> 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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