Otolith marking of juvenile shortnose gar by immersion in oxytetracycline

North American Journal of Fisheries Management
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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.

Additional publication details

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