Based on behavioral changes in
exposed fish, Zimba et al. (2004)
suggested that the euglenoid toxin
functions as a neurotoxin. The toxin
is water soluble, non-protein, heat
stable (30 °C for 10 minutes), freezing
stable (-80 °C for 60 days), and
labile to oxidation. Euglenoids should
be sensitive to several of the algicides
available. If a toxic Euglena bloom occurs,
try to minimize mixing of the
water because mixing will disburse
the bloom throughout the pond. Aerate
only if needed to save the fish
from acute oxygen depletion. Although
Euglena sp. are normally very
mobile, as a bloom progresses to the
point that fish are disorientated, the
algae seem to become concentrated
in the downwind side of the pond.