Abstract
Abstract Fry of chum salmon (Oncorhynchus keta; average weight, 0.58 g) and coho salmon (Oncorhynchus kisutch; average weight, 0.23 g) were tagged with halflength (0.5-mm-long) coded wire tags. Histologic examination revealed main-stem olfactory nerve damage or placement of tags into the frontal lobe of the brain or both, in 18–37% of the fish examined. Such damage and placement should be of particular concern because of the well-documented role olfaction plays in salmonid behavior and the poor regenerative capacity of nervous tissue.
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