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Status of Dolphin Stocks in the Eastern Tropical Pacific

In: Wildlife 2001: Populations

Author

Listed:
  • D. P. DeMaster

    (National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Science Center)

  • E. F. Edwards

    (National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Science Center)

  • P. Wade

    (National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Science Center)

  • J. E. Sisson

    (National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southwest Fisheries Science Center)

Abstract

Since the passage of the U. S. Marine Mammal Protection Act, approximately 1.25 million dolphins have been killed incidentally during purse seine fishing operations for yellowfin tuna (Thunnus albacares) in the eastern tropical Pacific Ocean. The three species of pelagic dolphins primarily involved in this fisheries interaction are the spotted dolphin (Stenella attenuata), spinner dolphin (Stenella longirostris), and common dolphin (Delphinus delphis). We review the status of these species relative to stock structure, current population size, levels of fishery-related mortality, and trends in abundance. Abundance estimates have been derived from two sources: data collected by observers on research vessels and data collected by observers on tuna vessels. Estimates of incidental mortality are currently derived only from data collected by observers on tuna vessels. There is no evidence of any significant change in abundance for any of these three species since 1985. However, declines in abundance have been detected over the last 15 yr.

Suggested Citation

  • D. P. DeMaster & E. F. Edwards & P. Wade & J. E. Sisson, 1992. "Status of Dolphin Stocks in the Eastern Tropical Pacific," Springer Books, in: Dale R. McCullough & Reginald H. Barrett (ed.), Wildlife 2001: Populations, pages 1038-1050, Springer.
    • Handle: RePEc:spr:sprchp:978-94-011-2868-1_79
    DOI: 10.1007/978-94-011-2868-1_79
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