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Environmental Biology of Fishes

, Volume 50, Issue 1, pp 63–73 | Cite as

Young whale sharks, Rhincodon typus, feeding on a copepod bloom near La Paz, Mexico

  • Eugenie Clark
  • Diane R. Nelson
Article

Abstract

Seven small (3.2 to 5.2 m total length) whale sharks were observed suction feeding on patches of surface plankton in the Bay of La Paz within 1 km of shore and 2 km N of the phosphate dock at San Juan de la Costa, on 1–2 November 1993. The sharks were photographed and videotaped from the boat and by snorkelers in the water. When actively feeding the shark turned its head from side to side, part of the head was lifted out of the water, and the mouth opened and closed 7 to 28 times per minute (x=17, N=13). These suction gulps were synchronized with the opening and closing of the gill slits. This feeding behavior occurred only in the patchy areas of densely cloudy water, a layer 10 to 30 cm thick at the surface containing an immense concentration of copepods, 95% of which were identified as Acartia clausi. Remoras accompanying the whale sharks also fed on the plankton bloom.

Rhincodontidae suction feeding surface feeding plankton bloom plankton sampling Acartia clausi remoras basking shark 

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Eugenie Clark
    • 1
  • Diane R. Nelson
    • 2
  1. 1.Department of ZoologyUniversity of MarylandCollege ParkU.S.A
  2. 2.Department of Biological SciencesEast Tennessee State UniversityJohnson CityU.S.A

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