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Title: Cephalopods in the Diet of Swordfish (Xiphias gladius) Caught off the West Coast of Baja California, Mexico
Authors: Markaida, Unai
Hochberg, F.G.
LC Subject Headings: Cephalopoda--Predators of--Mexico--Baja California (Peninsula).
Swordfish -- Mexico -- Baja California (Peninsula).
Natural history--Periodicals.
Natural history--Pacific Area--Periodicals.
Issue Date: Jan-2005
Publisher: University of Hawaii Press
Citation: Markaida U, Hochberg FG. Cephalopods in the Diet of Swordfish (Xiphias gladius) Caught off the West Coast of Baja California, Mexico. Pac Sci 59(1): 25-41.
Series/Report no.: vol. 59, no. 1
Abstract: The lower beaks of 1,318 cephalopods from the stomach contents of 175 swordfish, Xiphias gladius, caught off the west coast of Baja California, Mexico, between 1988 and 1996 were analyzed. In total, 20 species of teuthoids, 4 octopods, and one vampyromorph were identified. Weights and lengths of cephalopods were estimated from the lower rostral lengths. Ommastrephid squids, primarily jumbo squid Dosidicus gigas of different maturing sizes, composed 60% by number and 82% by estimated weight. Three species of gonatids were identified and represented 22% by number. An unidentified species of Argonauta was the most abundant octopod, with 5.8% of the beak total. Ancistrocheirus lesueurii is recorded for the first time in the California Current. Distribution of cephalopods in the California Current and their size in the diet of other marine predators are discussed. The diet of swordfish was dominated by medium to large muscular squid species that probably are eaten in surface waters at night.
Pages/Duration: 18 pages
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 59, Number 1, 2005

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