Otolith marking of juvenile shortnose gar by immersion in oxytetracycline

Citations of this article
Mendeley users who have this article in their library.
Get full text


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.




Snow, R. A., & Long, J. M. (2017). Otolith marking of juvenile shortnose gar by immersion in oxytetracycline. North American Journal of Fisheries Management, 37(4), 724–728. https://doi.org/10.1080/02755947.2017.1317679

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free