Re: NANFA-- Daphnia

Al G Eaton (
Wed, 3 Mar 2004 16:58:01 -0800 (PST)

Daphnia reproduce one of two ways. Asexually, called
something like parthogenetically I think and sexually
when there are males present and conditions aren't
optimum. Normally a population of daphnia consists of
almost all females and the females release little
clones every couple of days. When a male daphnia
mates with a female, egg packets are formed and are
oblong and black. These become resting eggs and only
hatch when conditions become more favorable. You can
see the egg packets under the carapace of the females
a little more easily than you can see the clones, but
with close observation you should be able to see them


> Sounds about right to me, I really didn't think
> daphnia had egg sacs but laid
> eggs one at a time. BTW do you see any more of those
> giant cyclops lately?
> they were very cool.
> Moon

/"Unless stated otherwise, comments made on this list do not necessarily
/ reflect the beliefs or goals of the North American Native Fishes
/ Association"
/ This is the discussion list of the North American Native Fishes Association
/ To subscribe, unsubscribe, or get help, send the word
/ subscribe, unsubscribe, or help in the body (not subject) of an email to
/ For a digest version, send the command to
/ instead.
/ For more information about NANFA, visit our web page,