The haptophyte genus Prymnesium is
comprised mainly of toxin-producing
species that form harmful blooms
usually in brackish water (West et al.,
2006). Blooms of P. parvum have been
responsible for fish kills and significant
economic losses in Europe, North
America and other continents. Texas
has been hit with recurrent blooms
in several reservoirs and rivers and
Texas Parks and Wildlife has offered
some detailed advice regarding management
options (Sager et al., 2007).