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Abstract
We examined the effects of anatomical placement and fish TL on 8-month retention of standard-sized (1.2 × 2.7 mm) visible implant alpha (VIA) tags in 255 Rainbow Trout Oncorhynchus mykiss (128–368 mm TL) at 14-d intervals in a hatchery setting. Anatomical placement was strongly associated with tag retention at each sampling period following day 154, culminating with significantly fewer (P < 0.05) VIA tags retained in anal fin tissue (25%) than in postorbital adipose tissue (55%) on day 224. Logistic regression models suggested that TL was more strongly associated with retention when VIA tags were placed in postorbital adipose tissue than in anal fins. Visible implant alpha tag retention was significantly associated with TL for placement in the postorbital adipose tissue at each 14-d interval. Tag retention in anal fin tissue was associated with TL during the first 6-month period of the study and became less significant after day 182. Overall tag retention rates were lowest for fish < 200 mm TL at 15% and 25% for anal fin and postorbital adipose placement, respectively, but rose to 28% and 63% for fish 200–300 mm TL and 30% and 75% for fish >300 mm TL. Due to the effects of fish size and tagging location on tag retention in Rainbow Trout, we recommend VIA tag use only in fish > 200 mm, with placement in postorbital tissue. Estimates of VIA tag retention should also be considered before or during marking studies involving Rainbow Trout.
Received January 8, 2014; accepted June 4, 2014
ACKNOWLEDGMENTS
We thank Patrick Nero, Eric Krebbs, Sarah Zimmerman, and the staff at McNenny State Fish Hatchery for their assistance during the study. In addition, we thank Greg Simpson, Dylan Jones, and Grant Bauer of South Dakota Game, Fish, and Parks. We especially acknowledge the statistical suggestions made by Michael L. Brown of the Department of Natural Resource Management at South Dakota State University.