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JPR Advance Access published online on January 24, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm015
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Published by Oxford University Press 2007

The effect of early and late hatching on the escape response of walleye pollock (Theragra chalcogramma) Larvae

Steven M. Porter and Kevin M. Bailey

NOAA, National Marine Fisheries Service, Alaska Fisheries Science Center 7600 Sand Point Way NE, Seattle, WA 98115

Correspondence: SM Porter, NOAA, Alaska Fisheries Science Center, 7600 Sand Point Way NE, Seattle, WA 98115 USA. Phone: 1-206-526-4271, Fax: 1-206-526-6723, E-mail: steve.porter{at}noaa.gov

Received on September 22, 2006; revised on November 29, 2006; accepted on January 12, 2007


  Abstract

Hatching of fish eggs fertilized at the same time occurs over a period of several days. Differences in the escape response of fish larvae during the hatching period have not hitherto been studied. In this study the escape response of walleye pollock (Theragra chalcogramma) larvae over the hatching period was examined. Escape speed, response to multiple touches with a fine probe, response to water currents generated by a predator, and predation by euphausiids (Thysanoessa inermis) and amphipods (Pleusirus secorrus), were measured in the laboratory. Otolith measurements of field-collected larvae support a broad hatching period for walleye pollock eggs in the sea similar to that observed in the laboratory. The escape response of walleye pollock larvae was affected by rank in the order of hatching, thus with respect to predation, hatching order may affect the survival of larvae in the sea. Early hatching larvae were smaller, less sensitive to tactile stimulation, had a slower, weaker escape response and higher laboratory rates of predation mortality than those larvae that hatched later.

Key Words: escape response • fish larvae • Theragra chalcogramma • predation • mortality

Communicating editor: KJ Flynn


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