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Stress response and post-release mortality of blacktip sharks (carcharhinus limbatus) captured in shore-based and charter boat-based recreational fisheries
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2020
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Source: Fishery Bulletin, 118(3)
[PDF-1.08 MB]
Details:
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Journal Title:Fishery Bulletin
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Personal Author:
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NOAA Program & Office:
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Description:In the coastal waters of the
southeastern United States, the blacktip shark (Carcharhinus limbatus) is
targeted by recreational anglers and
is currently one of the most often
captured large coastal shark species.
We estimated postrelease mortality
(PRM) rates for blacktip sharks captured on rod and reel by shore-based
and charter-boat-based fishermen by
using acoustic transmitters (number
of sharks=81). Additionally, 24 blacktip sharks were tagged with pop-off
satellite archival tags (PSATs) to validate the survivorship obtained through
analysis of data from the acoustic transmitters. The stress response associated
with both recreational capture methods was quantified by using numerous blood chemistry characteristics.
Overall, 18.5% of blacktip sharks died
postrelease (17.1% and 20.0% of those
captured from shore and from charter
boats, respectively). The results of survivorship analysis based on data from
transmitters are consistent with results
inferred from data from PSATs, supporting our use of acoustic transmitters
to assess PRM in blacktip sharks. Fight
time had a significant effect on blood
pH, lactate, hematocrit, potassium, and
glucose for sharks caught from shore
but only on lactate for sharks caught
from charter boats. In general, the blood
chemistry characteristics assessed were
poor predictors of PRM. Fifty percent of
foul-hooked sharks (i.e., sharks hooked
anywhere but the jaw) died postrelease,
indicating the importance of the effect
of hook placement on PRM.
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Source:Fishery Bulletin, 118(3)
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Rights Information:CC BY
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Compliance:Submitted
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