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Abstract
Evaluation of Stirring during Artificial Spawning of Landlocked Fall Chinook Salmon
David Cook, Jill M. Voorhees* and Michael E. Barnes
Stirring eggs and milt during artificial spawning of salmonids is a well-established practice. However, it has not been objectively evaluated. This experiment compared egg survival of spawns of landlocked fall Chinook salmon (Oncorhynchus tshawytscha) that were either stirred with a turkey (Meleagris gallopavo) tail feather or unstirred during sperm activation. There was no significant difference in egg survival to the eyed-stage of development between the two treatments, with mean percent (SE) survival in the stirred eggs at 44.6% (7.4) compared to 42.9% (5.8) in the unstirred eggs. Mean percent (SE) survival to hatch was also not significantly different for stirred eggs at 40.0% (7.1) compared to unstirred eggs at 39.1% (6.0). Based on the results of this study, stirring landlocked fall Chinook salmon eggs and milt during sperm activation is unnecessary and can be eliminated with no impact to egg survival to hatch.
Published Date: 2023-09-25; Received Date: 2023-08-26