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Predation and food limitation as causes of mortality in larval herring at a spawning ground in British Columbia

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Abstract
  • We quantified both in situ predation on Pacific herring (Clupea haregus pallasi ) larvae by soft-bodied zooplankton, and microzooplankton prey of herring larvae in Kulleet Bay, Vancouver Island, British Columbia. Samples were collected at 0 to 5 m depth daily at peak larval hatching from 14 to 21 April 1985. The hydromedusa Aequorea victoria was the only soft-bodied zooplankter that ate herring larvae. Densities of A. victoria reached as much as 17 m⁻³, and averaged 1 to 5 m⁻³. Predation on the herring larvae was severe, averaging 57 ± 29% d⁻¹ of larvae during each sampling period. Microzooplankton prey of post-yolksac herring larvae were mainly copepod nauplii and eggs, shelled protozoans, and bivalve veligers, and averaged 40.8 ± 21.51⁻¹ in the environment.
  • Keywords: Clupea harengus pallasi, mortality causes, zooplankton, spawning ground, fish larvae
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  • Purcell, J. E., & Grover, J. J. (1990, January 11). Predation and food limitation as causes of mortality in larval herring at a spawning ground in British Columbia. Marine Ecology Progress Series, 59, 55-61.
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  • 59
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  • This research was supported by Natural Sciences and Engineering Research Council strategic grant G0871 to Dr. Mackie, a Department of Fisheries and Oceans, Canada, subventions grant to G.0. Mackie and J.E. Purcell, and funds from the Oregon State University Sea Grant Program to J.E. Purcell.
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