Validation of annual periodicity in otoliths of red snapper, <Emphasis Type="Italic">Lutjanus campechanus</Emphasis> |
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Authors: | Stephen T Szedlmayer Sabrina G Beyer |
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Institution: | (1) Department of Fisheries and Allied Aquacultures, Auburn University, 8300 State Hwy 104, Fairhope, AL 36532, USA |
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Abstract: | The periodicity of otolith growth increments (opaque and translucent zones) from adult red snapper (Lutjanus campechanus) was examined through a mark and recapture study (2005–2010), and laboratory holding of hatchery reared red snapper over
a 2 year period (2002–2004). Wild red snapper (n = 295) were caught hook-and-line, marked with anchor tags, injected with oxytetracycline dihydrate (OTC), and released in
the Gulf of Mexico 15–40 km south of Dauphin Island, Alabama. Marked fish were recaptured up to 2.8 years after release (n = 35) and sagittal otoliths were dissected, sectioned and examined under white and blue-violet light. The number of opaque
growth zones past the OTC mark was compared to time at liberty for each fish and supported an annual periodicity of growth
increment formation. Also, most (87%) of the hatchery reared fish showed two opaque zones that supported an annual increment
formation rate. However, an unusual timing of opaque zone formation was shown for mark-recaptured fish. Based on known timing
of OTC marking, otoliths from mark-recapture fish showed opaque zone formation from late summer (August) to early winter (December).
This fall formation of opaque zones is in contrast to previous studies and its timing may relate to the end of spawning for
this species. |
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