Evaluation of a Pound Net Leader Designed to Reduce Sea Turtle Bycatch

Silva, Ryan D. and Dealteris, Joseph T. and Milliken, Henry O. (2011) Evaluation of a Pound Net Leader Designed to Reduce Sea Turtle Bycatch. Marine Fisheries Review, 73(3), pp. 36-45.

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Official URL: http://spo.nmfs.noaa.gov/mfr733/mfr7333.pdf

Abstract

Offshore pound net leaders in the southern portion of Chesapeake Bay in Virginia waters were documented to incidentally take protected loggerhead, Caretta caretta, and Kemp’s ridley, Lepidochelys kempii, sea turtles. Because of these losses, NOAA’s National Marine Fisheries Service (NMFS) in 2004 closed the area to offshore pound net leaders annually from 6 May to 15 July and initiated a study of an experimental leader design that replaced the top two-thirds of the traditional mesh panel leader with vertical ropes (0.95 cm) spaced 61 cm apart. This experimental leader was tested on four pound net sites on the eastern shore of Chesapeake Bay in 2004 and 2005. During the 2 trial periods, 21 loggerhead and Kemp’s ridley sea turtles were found interacting with the control leader and 1 leatherback turtle, Dermochelys coriacea, was found interacting with the experimental leader. Results of a negative binomial regression analysis comparing the two leader designs found the experimental leader significantly reduced sea turtle interactions (p=0.03). Finfish were sampled from the pound nets in the study to assess finfish catch performance differences between the two leader designs. Although the conclusions from this element of the experiment are not robust, paired t-test and Wilcoxon signed rank test results determined no significant harvest weight difference between the two leaders. Kolmogorov-Smirnov tests did not reveal any substantive size selectivity differences between the two leaders.

Item Type: Article
Title: Evaluation of a Pound Net Leader Designed to Reduce Sea Turtle Bycatch
Personal Creator/Author:
CreatorsEmail
Silva, Ryan D.
Dealteris, Joseph T.
Milliken, Henry O.
Refereed: Yes
Journal or Publication Title: Marine Fisheries Review
Volume: 73
Number: 3
Page Range: pp. 36-45
Date: 2011
ISSN: 0090-1830
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Management
Item ID: 9661
Depositing User: Patti M. Marraro
Date Deposited: 14 Aug 2012 12:33
Last Modified: 14 Aug 2012 12:33
URI: http://aquaticcommons.org/id/eprint/9661

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