LAUSR

AbstractThe use of production-sized incubators for experiments on eggs from fish populations that have limited egg numbers can be problematic because of the risks associated with potentially hazardous treatments on large numbers of eggs. This study evaluated the technique of incubating small numbers of eggs from landlocked fall Chinook Salmon Oncorhynchus tshawytscha in petri dishes from shortly after fertilization through hatch. In the first experiment at 9°C, each dish held 10 eggs. Three water change intervals were used before the eyed stage: every day, every 3 d, and every 7 d. After egg eye-up, each original water treatment was divided into water changes of either every day or every 3 d, creating a total of six water change treatments. Water change treatments were the same in the second experiment, but each dish held 15 eggs and the water temperature was 11°C. No significant differences among the treatments were observed in survival to the eyed egg stage or to hatch in either of the experiments. The ...