Short Term Survival and Tag Retention of Gizzard Shad Implanted with Dummy Transmitters

We know very little about the Gizzard Shad Dorosoma Cepedianum life history or habitat use at the northernmost edge of their native range. The South Dakota Department of Game, Fish, and Parks wanted to conduct an acoustic Telemetry Study to get a better understanding of Gizzard Shad movement and habitat use. Adult Gizzard Shad have never had telemetry tags surgically placed on them. This study was designed to assess whether Gizzard Shad are able to survive surgery and handling, determine short-term survival rates and retention of tags after surgery, and examine what factors impact the survival rate of tagged adult Gizzards Shad. Forty adult Gizzard Shad were surgically tagged with VemcoV13 dummy tag and 40 control fish were placed into a floating net pen. The average survival rate of the control fish was 90%, while that of the tagged fish was 88%. We could not detect any significant differences in survival between tagged and control fish due to the small sample size. The short-term retention of tags was high. Only one fish lost a tag in the study. The survival rate of Gizzard Shad tagged with telemetry tags increased with increasing temperature at capture. The results indicate that Gizzard Shad are suitable for surgical implantations of telemetry tags. Gizzard Shad’s survival rate was affected by warmer water temperatures. This highlights the importance of life history information being considered when planning and implementing future tagging research.

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