Effects of commercial fishing regulations on stranding rates of bottlenose dolphin (Tursiops truncatus).

Byrd, Barbie L. and Hohn, Aleta H. and Munden, Fentress H. and Lovewell, Gretchen N. and Lo Piccolo, Rachel E. (2008) Effects of commercial fishing regulations on stranding rates of bottlenose dolphin (Tursiops truncatus). Fishery Bulletin, 106(1), pp. 72-81.

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Abstract

Fisheries management actions taken to protect one species can have unintended, and sometimes positive, consequences on other species. For example, regulatory measures to reduce fishing effort in the winter gillnet fishery for spiny dogfish (Squalus acanthias) off North Carolina (NC) also led to decreases in the number of bycaught bottlenose dolphins (Tursiops truncatus). This study found that a marked decrease in fishing effort for spiny dogfish in NC also corresponded with a marked decrease in winter stranding rates of bottlenose dolphins with entanglement lesions (P= 0.002). Furthermore, from 1997 through 2002, there was a significant positive correlation (r2 = 0.79; P= 0.0003) between seasonal bycatch estimates of bottlenose dolphins in gill nets and rates of stranded dolphins with entanglement lesions. With this information, stranding thresholds were developed that would enable the detection of those increases in bycatch in near real-time. This approach is valuable because updated bycatch estimates from observer data usually have a time-lag of two or more years. Threshold values could be used to detect increases in stranding rates, triggering managers immediately to direct observer effort to areas of potentially high bycatch or to institute mitigation measures. Thus, observer coverage and stranding investigations can be used in concert for more effective fishery management.

Item Type: Article
Title: Effects of commercial fishing regulations on stranding rates of bottlenose dolphin (Tursiops truncatus).
Personal Creator/Author:
CreatorsEmail
Byrd, Barbie L.Barbie.Byrd@noaa.gov
Hohn, Aleta H.Aleta.Hohn@noaa.gov
Munden, Fentress H.
Lovewell, Gretchen N.Gretchen.Lovewell@noaa.gov
Lo Piccolo, Rachel E.
Journal or Publication Title: Fishery Bulletin
Volume: 106
Number: 1
Page Range: pp. 72-81
Date: 2008
Issuing Agency: United States National Marine Fisheries Service
Uncontrolled Keywords: bottlenose dolphin; Tursiops truncatus;commercial fishing; stranding
Subjects: Management
Fisheries
Biology
Item ID: 2084
Depositing User: Patti M. Marraro
Date Deposited: 17 May 2009 17:36
Last Modified: 29 Sep 2011 19:41
URI: http://aquaticcommons.org/id/eprint/2084

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