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Preliminary estimates of 2003 dolphin abundance in the eastern tropical Pacific
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2005
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Series: Administrative report LJ ; 05-05
[PDF-1013.40 KB]
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Description:A large-scale line-transect survey was carried out in 2003 to estimate the abundance of dolphins involved with the yellowfin tuna purse-seine fishery in the eastern tropical Pacific Ocean. Preliminary 2003 estimates of abundance for northeastern offshore spotted dolphins and eastern spinner dolphins, the stocks most affected by the fishery, are 737,000 (CV=0.15) and 613,000 (CV=0.22), respectively. Estimates of abundance are also given for 8 other dolphin stocks in the study area: western/southern offshore spotted, whitebelly spinner, striped, rough-toothed, common, bottlenose and Risso's dolphins. Estimates of abundance for northeastern offshore spotted and eastern spinner dolphins are slightly higher than recent past estimates. Results are preliminary until some differences from past surveys are better understood, and until all past estimates are reanalyzed with 2003 school size calibration factors.
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Content Notes:Tim Gerrodette, George Watters, and Jaume Forcada.
"June 2005."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (pages 25-26).
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Rights Information:Public Domain
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