Fresh water invertebrates query

Tony Saunder Davies tonysd at
Fri Sep 1 13:39:21 EST 1995

I keep rotifers and copepods alive for months in petri dishes.  Fill with 
the algae in which they are collected to a depth of 5 mm or so and expose 
to daylight.  In the case of brackish and marine species (my main 
interest) I have to top up with de-ionised water every few days to 
prevent the salinity rising too far, even with the dishes covered.

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