Landlocked Fall Chinook Salmon Egg Survival during Jar and TrayIncubation at a Production Hatchery

摘要

This study compared the survival of landlocked fall Chinook salmon Oncorhynchus tshawytscha eggs incubatedin either upwelling jars, either with or without daily formalin treatments, or vertically-stacked trays treated dailywith formalin in a production hatchery. In the first year of the study, survival to the eyed-egg stage was significantlygreater in eggs incubated in jars without formalin compared to trays, but there was no significant difference in survival tohatch between the treatments. In the second year, there were no significant differences in eggs incubated in trays, in jarswithout formalin treatments, and in jars with formalin treatments. In the final year, there was no significant difference ineyed-egg survival between eggs incubated in trays and jars without formalin, but survival to hatch was significantlygreater in the eggs incubated in jars. Jar incubation is recommended to maximize the survival of landlocked fall Chinooksalmon eggs.