RE: NANFA-- hydras, flatworms, etc.

Hoover, Jan J ERDC-EL-MS (
Tue, 10 Jun 2003 20:16:46 -0500

Dave wrote:
>>>I was looking at Pennack this
morning, and plopped a couple of the worms under a borrowed dissecting
scope. I'm thinking they may be freshwater oligochaetes. They have what seem
to be very faint eye spots, and I also noted that they seem to have "buds"
near the tail that are perhaps fixing to bud many of these
freshwater annelids apparently do.<<<

Jan writes:
Those are probably naids (Naididae). Many of them have eyespots and
reproduce by forming chains of zooids. Most are harmless to fishes and
invertebrates. They are abundant in the diatom-felt that covers submerged
wood in blackwater streams.
The older aquarium literature (< 1960) often contains information on hydras,
flatworms, and segmented worms, probably because old-time hobbyists were
more likely to collect their own fish food and encounter them. Two books
(previously mentioned on this list) that cover these groups are: "Field
Guide to Lower Aquarium Animals" by Edward T. Boardman (Cranbrook Institute
of Science, 1939) and "Aquarium High Lights" by William T. Innes (Inness
Publishing Company, 1951). The first views invertbrates as pets, the second
as pests, but both contain a lot of good information and are available from
used book dealers.
/"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,