Stress response and post-release mortality of blacktip sharks (carcharhinus limbatus) captured in shore-based and charter boat-based recreational fisheries

Details

• Journal Title:
  Fishery Bulletin
• Personal Author:
  Weber, D. Nick ; Frazier, Bryan S. ; Whitney, Nicholas M. ; Gelsleichter, James ; Sancho, Gorka
• NOAA Program & Office:
  CPO (Climate Program Office) ; OAR (Oceanic and Atmospheric Research)
• 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.
  
  
• Keywords:
  Blacktip Shark Fishing Blacktip Shark
• Source:
  Fishery Bulletin, 118(3)
• DOI:
  https://doi.org/10.7755/FB.118.3.8
• Document Type:
  Journal Article
• Funding:
  Grant no. NA16NMF4540081
• Place as Subject:
  North Atlantic Ocean
• Rights Information:
  CC BY
• Compliance:
  Submitted
• Main Document Checksum:
  urn:sha256:88521385c09a2f3490749a61fac0a63c49b059fa6d2a337740869118e6a378ea
• Download URL:
  https://repository.library.noaa.gov/view/noaa/29151/noaa_29151_DS1.pdf
• File Type:
  [PDF - 1.08 MB ]