Otolith marking of juvenile shortnose gar by immersion in oxytetracycline
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Abstract
Oxytetracycline (OTC) has been used to mark a variety of fish species at multiple developmental stages; however, there is little information on batch-marking Lepisosteidae. Juvenile Shortnose Gar Lepisosteus platostomus (53 ± 3 mm TL) were seined from an Oklahoma State University research pond and transported to the Oklahoma Fishery Research Lab. Juvenile Shortnose Gar were exposed to a range of OTC concentrations—0, 500, 600, and 700 mg/L—for 4, 5, or 6 h. Lapillus and sagitta otoliths were examined 14 d postexposure for mark presence and evaluation using fluorescent microscopy. Overall, 93.3% of otoliths exposed to OTC exhibited a mark. Concentration of OTC affected the mean mark quality, whereas duration and otolith type examined did not. However, as concentration increased, so did mortality, suggesting a balance is needed to achieve marking goals. Based on our findings, batch marking of Shortnose Gar can be successful at OTC concentrations from 500 to 700 mg/L for 4–6 h, although mark quality may vary and mortality rates increase at the higher concentrations and longer durations.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Otolith marking of juvenile shortnose gar by immersion in oxytetracycline |
| Series title | North American Journal of Fisheries Management |
| DOI | 10.1080/02755947.2017.1317679 |
| Volume | 37 |
| Issue | 4 |
| Year Published | 2017 |
| Language | English |
| Publisher | Taylor & Francis |
| Contributing office(s) | Coop Res Unit Atlanta |
| Description | 5 p. |
| First page | 724 |
| Last page | 728 |
| Google Analytic Metrics | Metrics page |