This paper discusses the influence of predation by a planktivorous fish on
zooplankton assemblages within experimental billabongs. Results suggest tha
t the presence of a small planktivorous fish in experimental billabongs had
only a small influence on the structure of zooplankton assemblages and den
sities of rotifers. Microcrustacean populations were dominated by juveniles
, however there were greater numbers of juveniles when the planktivorous fi
sh were present.