Rapid Placement and Retention of Passive Integrated Transponder (PIT) Tags in Grass Carp

Passive integrated transponder (PIT) tags were placed in 15,344 triploid grass carp (Ctenopharyngodon idella) (200-280 mm total length) and length, weight, and tag-code data recorded for each fish at rates of 206 to 350 fish per hour. Only 43 fish (0.28%) died within 48 hours post-tagging. Survival of tagged (N = 122) and untagged (N = 131) groups of fish held in ponds 83 to 115 days post-tagging was >90% and near equal, except for 1 tagged and 1 untagged group where a columnaris disease outbreak occurred; survival in those groups was 68.0% and 69.1%, respectively. All tags were retained in the fish and functioned properly after 83-85 days in ponds. After 1 group of fish (N = 29) had been in a pond for 225 days, tag responses were found for all but 1 fish. The techniques used for tag placement and data recording utilized equipment generally available at most fisheries laboratories.

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