Inhibitory effect of sodium bicarbonate on the
motility of sperm of Japanese eel
S.
Tanaka, H. Zhang, Y. Yamada, A. Okamura, N. Horie, T.
Utoh, N. Mikawa, H.P. Oka, H. Kurokura-2002
Journal
of Fish Biology, 60(5): 1134-1141
Abstract:
Sperm
motility of Japanese eel Anguilla japonica was depressed from
59·1 to 1·1% when NaHCO3 concentration increased
from 0 to 150m M. In 25m M NaHCO3, when pH
of the medium was 6·2, 7·2, 8·2, 9·2 and 10·2, relative
sperm motility was 0, 0, 55·8, 93·7 and 136·6%, respectively
to that of the control (0m M NaHCO3). The remarkable
effect in acid or neutral condition indicates that
free-CO2 (liberated CO2 and H2CO3)
is a key factor for the motility inhibiting effect of
NaHCO3.
(IRAGO
Institute, Shinden 377-Ehima, Atsumi-cho, Atsumi-gun, Aichi, 441-3605,
Japan, Tel.: +81 531 37 1680; fax: +81 531 34 3111; email: tanaka@irago.co.jp)