Despite all the above-mentioned
advantages, interest is on eco-toxic
properties of plant origin pesticides (Singh
and Singh, 2002). Pesticides of plant origin
cannot be used directly in freshwater unless
their toxicity has been studied on the nontarget
animals sharing the habitat with the
target animals (Singh and Singh, 2002).
However, there is the need to search for
aquaculture management practice that will
be environmentally acceptable, biotechnically
feasible, socio-economically
viable, cost-effective and free from water
pollution to avoid health risk to the
consumers of food fish from aquaculture.
Moringa oleifera is a tree belonging to the
family Moringaceae, usually growing comparative purposes (USEPA, 2000).
Acute-lethal toxicity test can be done in the
laboratory using static, semi-static and
renewable methods as the case may be. In
modern toxicology, it is usually advisable
for the toxicologist to use the renewable
method whereby test solutions are renewed
at 48 hours in a 96-hour acute-lethal toxicity
test (Adesina, 2008). Test solutions should
be renewed with the original biocide
(toxicant) solution prepared at the start of
the test (Marshall, 2003).