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The following schedule is subject to change (as of October 11, 2016). Please check back for updates. For more information about this meeting, go to: www.seafwa.org/conferences/2016
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Tuesday, October 18 • 11:20am - 11:40am
Fisheries. Daily Age Validation of Otoliths in Spotted Gar (Lepisosteus oculatus)

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AUTHORS: Richard A. Snow, Oklahoma Department of Wildlife Conservation; James M. Long, U.S. Geological Survey Oklahoma Cooperative Fish and Wildlife Research Unit; Bryan D. Frenette, Division of Biology, Kansas State University

ABSTRACT: Accurate age and growth information is essential in successful management of fish populations and for a complete understanding of early life history. We validated daily ring formation, including the timing of first ring formation, for Spotted Gar (Lepisosteus oculatus), a species of conservation concern, through 127 days post-hatch. From fry produced from hatchery-spawned specimens, up to 10 individuals per week were sacrificed and their otoliths (sagitta, lapilli, and asteriscus) removed for daily age estimation. Daily age estimates for all three otolith pairs were significantly related to known age (r² ≥ 0.95), but the strongest relationship existed for measurements from sagittae (r² = 0.98) and the lapillus (r² = 0.98). Age prediction models all resulted in a slope near unity, indicating that ring deposition occurred approximately daily. Timing of ring formation varied among otolith types; sagitta approximately 3 days after hatch, lapillus 7 days after hatch (i.e., swim-up), and asteriscus 9 days after hatch. These results fill a gap in knowledge and can aid understanding of evolutionary processes as well as provide useful information for management and conservation.

Tuesday October 18, 2016 11:20am - 11:40am
Riverview A

Attendees (6)