Sperm Density During Active Spawning of Pacific Herring (Clupea harengus pallasi)

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Abstract
Discharge of milt by spawning Pacific herring (C. harengus pallasi) produces a milky discoloration in the water which is readily observed under favorable conditions of weather and light. Echo-sounder tracings showed that only the inshore part of a spawning school that was in contact with the bottom participated in the early stages of spawning. Sperm densities at the surface for 2 spawnings averaged 148 and 129 sperm/ml (range 80-210 for 16 subsamples). This density is considered more than ample for high fertilization success but is only 1/10 that normally used for artificial fertilization in the laboratory at Nanaimo [British Columbia, Canada].

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