Tolerance
of Incubating Walleye Eggs to Temperature Fluctuation
J.C. Schneider, J. Copeland,
M. Wolgamood-2002
North American Journal of Aquaculture, 64(1): 75–78
Abstract:
Eggs of walleyes Stizostedion vitreum
incubating under hatchery conditions were subjected to temperature
fluctuations of
- 8.8,
- 9.3,
+13.6, +20.2, or
- 21.1
followed by +21.1°C. We found that eye-up rates remained approximately 70%
for all control and test lots. Swim-up rates were reduced from approximately
90% for the control and first three temperature variations to 42% and 13.6%
for the last two temperature variations. We conclude that temperature
fluctuations great enough to directly affect incubating walleye eggs are
unlikely to occur in hatcheries or on natural spawning grounds.