Abstract:
The objective of the research was to test the effec
t of iron and aluminium coagulants
commonly used for lake re-cultivation, on the pike
sperm motility and fertilisation. The
coagulants caused changes in the analyzed hydrochem
ical parameters of the water such
as: Fe, Mg
2+
, TSS, SO
4
2-
and Cl
-
. Selected parameters of sperm motility: MOT, VCL,
VSL, VAP, LIN were estimated using CASA. The sperm
motility at the moment of
activation was the highest in the control sample. W
ith increasing the time of exposure the
proportion of sperm motility in the analyzed semen
decreased. In the samples with
coagulants the values of MOT, VCL and VSL were smal
ler than in the control sample
(statistically significant differences between the
control and the samples with PIX and
PAX were recorded in the 25
th
-30
th
second after activation). The percentage of fertil
ised
eggs was the greatest in the control sample and in
the PAX®18 sample (73.11 and 70.42%,
respectively), whereas in the PIX®113 it was less t
han that (54.88%). The shortest larvae
were those in the sample with coagulant PIX®113. In
the samples with PIX®113 and
PAX®18 the survivorship of embryos compared to the
control sample was the smallest
(43.10 and 51.61%, respectively and control 67.60%)
and the proportion of malformed
larvae was the highest (34.82 and 24.52%, respectiv
ely and control 15.17%).
Keywords:
Coagulants, Fertilisation, Lake, Pike, Sperm moti
