The growth analysis of groups exposed for 48 hours was carried out until the 60º day of observation
due to the high mortality on these groups after this period. The tests demonstrated that the average size
of groups exposed for 24 h do not differed from
control group at the end of 90 days (H=0.8628,
p=0.353). Nevertheless, the exposure time influenced
the growth and the higher exposure period showed a
lower growth in comparison to control group (H= 8.6729, p=0.0033). The average size obtained for
the groups exposed for 24 h was 9.66±0.87 mm
and 8.6±1.93 mm for control and exposed groups
respectively and to the groups exposed for 48 h the
average size was 10.00±1.71 mm for control group
and 7.06±1.61mm for exposed group.
In groups exposed for 24 hours, reached sexual
maturity at about 81±8.5 days in 40% of snails
that survived at the end of 90 days and for control
groups exposed for the same period this percentage
was from 13% with an average age of 59±4.9 days.
On the other hand, snails exposed for 48 h did
not reach maturity until the end of the experiment.
In control groups exposed for 48 h 37% of the
snails reached maturity at the end of 90 days, with
average age of 56.7±3.6 days.