Codend selection of winter flounder Pseudopleuronectes americanus

Simpson, David G. (1989) Codend selection of winter flounder Pseudopleuronectes americanus. NOAA/National Marine Fisheries Service, (NOAA Technical Report NMFS, 75)

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Codend selection of winter flounder (Pseudopleuronectes americanus) in 76-127 mm mesh codends was examined from experiments conducted in Long Island Sound during the spring of 1986-87. The results show a slightly larger size at selection than was found in earlier work as indicated by the selection factor, 2.31 in the present study compared with 2.2 and 2.24 from previous studies. Diamond mesh was found to have a length at 50% retention about 1 cm longer (Lso =22.6 cm), and a selection range (3.4 cm) about 1 cm narrower, than square mesh in 102-mm codends. Tow duration varied from 1 to 2 hours using 114-mm diamond mesh. As has been found in previous studies, tow duration and Lso are positively related, with I-hour tows averaging 24.6 cm and 2-hour tows averaging 26.6 cm. The importance of the slope of the selection curve was examined in yield-per-recruit analyses by comparing knife-edge and stepwise recruitment. In all mesh sizes, stepwise recruitment provides a more conservative estimate of yield in the presence of a minimum size limit. Differences in yield estimates between the two models were generally small (1-7%), except in the largest mesh size, 127 mm, where yield is overestimated by 10% when assuming knife-edge recruitment. (PDF file contains 16 pages.)

Item Type: Monograph or Serial Issue
Title: Codend selection of winter flounder Pseudopleuronectes americanus
Personal Creator/Author:
Simpson, David G.
Series Name: NOAA Technical Report NMFS
Number: 75
Date: 1989
Publisher: NOAA/National Marine Fisheries Service
Issuing Agency: United States National Marine Fisheries Service
Subjects: Ecology
Item ID: 2746
Depositing User: Patti M. Marraro
Date Deposited: 04 Nov 2009 15:30
Last Modified: 29 Sep 2011 18:24

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