Survival and growth of age-0 steelhead after surgical implantation of 23-mm passive integrated transponders

Bateman, D. S.; Gresswell, R. E.

Abstract:

Little information is available on the effects of implanting 23-mm passive integrated transponder (PIT) tags in salmonids less than 90 mm fork length (FL). Using juvenile steelhead Oncorhynchus mykiss (range, 73-97 mm FL), we compared instantaneous growth rates and survival among three experimental groups: control, surgery with no tag, and surgery with tag. Survival rate was lower for tagged fish (86%) than for control and surgery-no tag fish (virtually 100% in each group). Approximately 90% of the mortalities occurred during days 1-3. Growth rate for the tagged group was lower for the first two 10-d measurement intervals; however, during the third 10-d interval, growth rates for tagged fish equaled or exceeded values for the other groups. These results suggest that tagged fish recovered by day 20. Growth rates for the control and surgery-no tag groups did not differ from one another during any measurement interval. Tag retention rate was 97% over the 30-d period of the study. It appears that the combination of fish length and tag size in this study resulted in short-term negative effects on growth rate and survival; however, 23-mm PIT tags may still be useful for studies of salmonids 80-90 mm FL when survival is not the parameter of interest. ?? Copyright by the American Fisheries Society 2006.

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Article

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70028878

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Bateman, D. S.; Gresswell, R. E.

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550

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English

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North American Journal of Fisheries Management

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Survival and growth of age-0 steelhead after surgical implantation of 23-mm passive integrated transponders; 2006; Article; Journal; North American Journal of Fisheries Management; Bateman, D. S.; Gresswell, R. E.