Abstract
Abstract Recent studies have demonstrated the feasibility of using passive integrated transponder (PIT) tags for tracking crayfish spatiotemporally in streams. PIT tags can be inserted internally for long-term tracking, assuming low tagging mortality, or attached externally for shorter-term tracking until the individual molts. To date, the practical use of internal cephalothorax tagging has been limited to individuals >30 mm carapace length (CL). The efficacy of internal tagging for small-bodied crayfish species or juveniles of large-bodied species remains poorly understood. We conducted studies with the small-bodied Orconectes compressus (Slender Crayfish) to assess whether internal placement of small PIT tags (8.5 mm long, 2.12 mm diameter) was a viable methodology for future ecological work. In the field, we tagged 63 crayfish and monitored them with a portable transceiver system for 1.5 weeks. In the laboratory, we tagged 21 crayfish and maintained 21 control crayfish for 12 weeks. Crayfish averaged 1...
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