Duration of
synchronous egg cleavage cycles at different temperatures in Siberian
sturgeon (Acipenser baerii)
E. Gisbert, P. Williot-2002
Journal of
Applied Ichthyology, 18(4-6): 271-274
Abstract:
The duration of synchronous cleavage
divisions, equal to the interval between the corresponding mitotic phases of
two consecutive cleavage divisions (τ0), was determined in
Siberian sturgeon (Acipenser baerii Brandt) at different water
temperatures. The linear relationship between τ 0 (in
minutes) and water temperature (T) was log τ 0=2.79
-0.07T
(r=0.996; P<0.001) for a temperature interval between 8.3 and
12.0°C, while at higher temperatures (13-23.0°C) this relationship was log
τ 0=2.09
-0.02T
(r=0.910;P<0.001). According to τ 0 values,
the range of optimal temperatures for early development of Siberian sturgeon
eggs was between 12.5 and 20°C. At temperatures exceeding 20°C, τ
0 did not decrease and even exhibited a tendency to increase,
indicating the upper boundary of optimal temperatures for embryos.
(Lab. Acuicultura, Depto. Biología Animal, Fac. Biología, Universitat
de Barcelona, Av. Diagonal, 645, E-08028 Barcelona, Spain. E-mail: gisbert@porhtos.bio.ub.es)