Compared with the direct attack, most
phytoplankton-lytic bacteria prefer indirect attacks. An associated
heterotrophic dominant single bacterium (ZQS01) was once selected
for its inhibitive effect on Chlorella vulgaris through excreting
chemic substance (Zhou et al., 2011). As well as Wang et al.
(2010a,b), two strains of phytoplankton-lytic bacteria (DHQ25
and DHY3) had abilities of secreting algicidal proteins against axenic
Alexandrium tamarense.