Subject: freshwater-jellyfish

From: [email-masked] (Wilhelm Diekhaus)
Date: 4 Sep 1996 12:48:48 GMT

Hallo, 

has anyone informations about a freshwater-jellyfish ?

Tschuess
Willi

---

From: [email-masked] (Greg R Bright)
Date: Thu, 05 Sep 1996 20:03:49 GMT

The most common freshwater jellyfish is Craspedacusta sowerbyi.  It has a
world-wide distribution and lives in small lakes and quarries, especially those
that are very clear.  There are other species (1 in China, 3 in Africa, 7 in
India, and 1 in Trinidad).  This jellyfish feeds mainly on zooplankton.
Maximum size is about 22 mm in diameter.
 
---
 * Traders' Connection Web BBS * http://www.trader.com * [email-masked]

---

From: [email-masked] (Flconnor)
Date: 5 Sep 1996 20:51:16 -0400

C. sowerbyi is common in many lakes in my area (central Florida).  My
experience is that they tend to be found in the clear water lakes although
the water clarity in some of our more eutrophic lakes (<30 cm) may simply
hide them.  I can't translate this to any ranges of water quality
parameters.  Most of the time they are barely noticable, existing as a
small polyp attached to vegetation, sticks, etc.  The medusa phase is also
the reproductive phase and seems to occur at intervals of varying
frequency, triggered by population density, temperature, day length, ???. 
Maybe someone has some information on reproductive behavior and timing. 
When the medusae appear people notice and our office gets calls from
supprised individuals.