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Thursday, April 30, 2020 | History

2 edition of mid-net zipper ridge a possible cause of unobserved porpoise mortality found in the catalog.

mid-net zipper ridge a possible cause of unobserved porpoise mortality

D. B Holts

mid-net zipper ridge a possible cause of unobserved porpoise mortality

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  • 9 Currently reading

Published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Center in La Jolla, Calif .
Written in English

    Subjects:
  • Porpoises,
  • Purse seining

  • Edition Notes

    StatementDavid B. Holts
    SeriesNOAA-TM-NMFS-SWFC -- 3, NOAA technical memorandum NMFS SWFC -- 3
    ContributionsSouthwest Fisheries Center (U.S.)
    The Physical Object
    Pagination3 p. :
    ID Numbers
    Open LibraryOL14851199M


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mid-net zipper ridge a possible cause of unobserved porpoise mortality by D. B Holts Download PDF EPUB FB2

Mid-net zipper ridge a possible cause of unobserved porpoise mortality. La Jolla, Calif.: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Center, [] (OCoLC) Material Type: Government publication, National government publication, Internet resource: Document Type.

Mid-net zipper ridge a possible cause of unobserved porpoise mortality. La Jolla, Calif.: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Center, [] (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource.

It has long been suspected that unobserved porpoise mortality occurs in deep ar as of the seine prior to backdown. Program, NMFS divers observed that the mid-net zipper held up a wall of webbing 30 feet or more above the floor of the net (Fig.

1 A&B). mid-net zipper ridge, formed during the pursing operation and persisted until. The mid-net zipper ridge a possible cause of unobserved porpoise mortality / By D. B Holts and Southwest Fisheries Center (U.S.) Abstract. Mode of access: Internet Topics: Purse seining, Porpoises.

Publisher: La Jolla, Calif.: U. In delphinid species an offspring's weight is approximately 10 –15% that of the dam (Slijper, ). This high birth weight would not favour the survival of multiple foetuses and is likely to.

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