NANFA-- Daphnia/was "if you build it..."

Hoover, Jan J ERDC-EL-MS (
Wed, 9 Apr 2003 16:18:34 -0500

Bill F wrote:
>>>A friend told me that ducks are good for Daphnia. Apparently the
"fertilizer" they put into the water will give you a bloom of algal
growth and as long as there is nothing in the pond to eat the daphnia
they will thrive.<<<

Jan writes:
Last Saturday our nature center had its annual Nature Day celebration and I
was working a "Life Under the Microscope" station. Mid-day, I took a group
of kids out to a small (6 by 15 ft) puddle of water in the woods where I had
set a light-trap the night before. It contained a sizable mass of Daphnia
and other water fleas. Volume of the plankton (out of water) was
approximately that of a a tennis ball. Its not uncommon to collect
zooplankton in light-traps (sometimes numbering in 100s or 1000s), but I had
never seen a mass of water fleas like this before. The kids were impressed.
They looked at the water fleas in the trap, under the scopes, and then fed
them to the sunfish and darters in the aquarium.

Pond contained a few chironomids, some crawling water beetles (Haliplidae),
and a few pond snails, but little else. It was on a moderately steep slope,
was a foot deep and completely shaded. Nutrent source was a thick layer of
leaf litter.

Details on light-traps can be found in the latest (Winter 2003) issue of
American Currents.
/"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,