The percentage of mortality of Artemia nauplii (Instar I) and adult
Artemia with different concentrations of the three Streptomyces
strains (CLS-28, CLS-39 and CLS-45) is depicted in Table 2. The LC50
(lethal dose for 50% of a sample population) of CLS-28 on nauplii and
adults were 7.0 and 8.0% cell mass per unit volume respectively (after
72 h). The LC50 of CLS-39 on nauplii and adult was 8.0 and 9.3%
respectively and the LC50 of CLS-45 on nauplii and adult was 6.5 and
7.0% respectively. Significantly higher (F=69.71, Pb0.01) mortality
was observed by CLS-45 strain for both nauplii (67.7%) and adult
(64.3%) with the increase of cell mass concentration