Estimation of summer flounder (Paralichthys dentatus) mortality rates using mark-recapture data from a recreational angler-tagging program
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作者:
Henderson, M. J.
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Coll William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USA
Southwest Fisheries Sci Ctr, Fisheries Ecol Div, Santa Cruz, CA 95060 USAColl William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USA
Henderson, M. J.
[1
,2
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Fabrizio, M. C.
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Coll William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USAColl William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USA
Fabrizio, M. C.
[1
]
机构:
[1] Coll William & Mary, Virginia Inst Marine Sci, Gloucester Point, VA 23062 USA
[2] Southwest Fisheries Sci Ctr, Fisheries Ecol Div, Santa Cruz, CA 95060 USA
Volunteer angler-tagging programs have the potential to become a valuable tool for estimating fish mortality rates. We applied a reduced version of the Barker mark-recapture model to estimate summer flounder mortality rates using data collected by an angler-tagging program in Virginia. Over a period of 12 years, recreational anglers released 47513 summer flounder in the Chesapeake Bay and its tributaries, of which 3240 were subsequently encountered. To account for heterogeneity in survival rates arising from size-based variation in fishing pressure, we categorized individual fish into size classes and used a growth model to predict recruitment of fish into each size class. Due to concerns regarding tag loss, a double-tagging study was conducted and revealed that summer flounder tag retention rates were low for both sublegal and legal sized fish (0.5 +/- 0.08 per year). The tag-loss corrected mortality probability estimates for the 30-day period following release were approximately 0.6 for sublegal fish (<36 cm) and 0.65 for larger fish. Once we compensated for this short-term mortality, we found that sublegal summer flounder experience much greater apparent annual mortality rates than larger fish. This may reflect actual differences in mortality as well as the increased likelihood of smaller fish to permanently emigrate to locations with reduced encounter probabilities. Due to these size-dependent mortality rates we were unable to estimate a natural mortality rate. We conclude that angler-tagging programs can provide some insights into fish mortality rates but, in order to do so, they must be carefully designed and account for the multiple violations of mark-recapture model assumptionS. (C) 2014 Elsevier B.V. All rights reserved.
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Virginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USAVirginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USA
Henderson, Mark J.
Fabrizio, Mary C.
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Virginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USAVirginia Inst Marine Sci, Coll William & Mary, Gloucester Point, VA 23062 USA
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US Fish & Wildlife Serv, Great Plains Fish & Wildlife Conservat Off, Pierre, SD 57501 USAUS Fish & Wildlife Serv, Great Plains Fish & Wildlife Conservat Off, Pierre, SD 57501 USA
Pierce, Landon L.
Graeb, Brian D. S.
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S Dakota State Univ, Dept Nat Resource Management, Brookings, SD 57007 USAUS Fish & Wildlife Serv, Great Plains Fish & Wildlife Conservat Off, Pierre, SD 57501 USA
Graeb, Brian D. S.
Willis, David W.
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S Dakota State Univ, Dept Nat Resource Management, Brookings, SD 57007 USAUS Fish & Wildlife Serv, Great Plains Fish & Wildlife Conservat Off, Pierre, SD 57501 USA
Willis, David W.
Sorensen, Jason S.
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South Dakota Dept Game Fish & Pk, Chamberlain, SD 57325 USAUS Fish & Wildlife Serv, Great Plains Fish & Wildlife Conservat Off, Pierre, SD 57501 USA
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Dept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, AustraliaDept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, Australia
Candy, S. G.
Welsford, D. C.
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Dept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, AustraliaDept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, Australia
Welsford, D. C.
Lamb, T.
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Dept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, AustraliaDept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, Australia
Lamb, T.
Verdouw, J. J.
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Dept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, AustraliaDept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, Australia
Verdouw, J. J.
Hutchins, J. J.
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Dept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, AustraliaDept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, Australia
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Dept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, AustraliaDept Sustainabil Environm Water Populat & Communi, Australian Antarctic Div, Kingston, Tas 7050, Australia