Re: Shrimp Still Dying

["Edward Venn" <e_venn at hotmail_com>]

Alex, Scott,

Caradina japonica are usually found in brackish water or water with a higher 
pH 7.8 or above. They are susceptible to trace elements such a iron and 
copper. Small amounts of iodine or other traces are not so damaging. In the 
course of a days collecting I can trap inexcess of 500 of these shrimp in L 
Tsuchira or in the Tone, Ara or Sumida river systems. The water where I find 
them is often brackish or has a high pH and is typically choked with algae. 
Losses are high and I can expect a 50% mortality-that's why I was offering 
these things on Aquabid at $1.50 each (you spend a day wading around in 
smelly water and mud, you definitely want some return on your effort)

Conversely, the Neocaradina sp are strictly freshwater and besides being 
easier to keep and breed, are more attractive. Their shortcomings are that 
they are much smaller (easier prey for medium sized fish) than the Amano 
Shrimp and don't consume algae in as large a quantity. They do breed like 
rabbits if well fed and cared for and won't resort to cannibalism if well 
fed and provided with lots of hiding places for the young.
>
>Aren't shrimp more susceptible to excess CO2 than most
>fish?  They certainly seem to come out of hiding when the
>CO2 gets past 30ppm or so.  Levels below that shouldn't be
>a problem, though.
>
>Aren't they also more susceptible to the presence of some
>trace metals and the absence of others?
>
>Scott H.


Edward Venn,
SMG Holdings Co., Ltd.,
Deux Chateaux Blanc 2-303,
1356 Kobuchi, Kasukabe,
Saitama, Japan


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