Movement patterns of adult red drum, <Emphasis Type="Italic">Sciaenops ocellatus</Emphasis>, in shallow Florida lagoons as inferred through autonomous acoustic telemetry |
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Authors: | Eric A Reyier Russell H Lowers Douglas M Scheidt Douglas H Adams |
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Institution: | (1) Kennedy Space Center Ecological Program/Innovative Health Applications, Mail Code: IHA-300, Kennedy Space Center, FL 32899, USA;(2) Florida Fish & Wildlife Conservation Commission, Fish & Wildlife Research Institute, 1220 Prospect Avenue #285, Melbourne, FL 32901, USA |
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Abstract: | Acoustic telemetry was employed to resolve seasonal and daily movement patterns of adult red drum (Sciaenops ocellatus) in the northern Indian River Lagoon system, Florida. From May 2006 to September 2008, 44 tagged fish were tracked within
an array of 34 autonomous receivers with individuals detected for up to 654 days. Most red drum exhibited strong site fidelity
from winter through early summer with movement rates increasing significantly during fall spawning months. While some fish
migrated to the nearest ocean inlet at this time, the majority remained within the lagoon year-round suggesting that true
estuarine reproduction, a behavior uncommon or poorly documented elsewhere is the dominant life history strategy locally.
Diel movement patterns were also pronounced and indicated changing depth preferences over a 24 h period. Despite a harvest
prohibition on large red drum, long-term estuarine residency coupled with high angling pressure (41% recapture rate in 50 months)
suggest that post-release angling mortality and sub-lethal effects to growth and reproduction may strongly influence the strength
of adult size classes. |
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