Abstract
Abstract Chum salmon (Oncorhynchus keta) fry were incubated over one of three artificial substrates and compared with a control group incubated over flat bare screen. Fry incubated over substrate were significantly larger in both mean weight and length (P < 0.001) than fry incubated without substrate. Fry size varied slightly among substrate groups but varied significantly due to tray position. Condition factors indicated that fry incubated over substrate completed yolk absorption sooner than fry incubated without substrate. We theorize that this is the result of lower levels of dissolved oxygen being immediately available to the alevins because they are less uniformly dispersed in the incubation container without substrate. Low levels of dissolved oxygen are known to retard yolk absorption in other salmonid alevins. Among the three substrate groups, Vexar was determined to be more time and cost effective than the other types of substrate tested.
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