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The Biological Bulletin, Vol 194, Issue 1 25-35, Copyright © 1998 by Marine Biological Laboratory

DEVELOPMENT AND REPRODUCTION

Effects of Salinity on Sperm Motility, Fertilization, and Development in the Pacific Herring, Clupea pallasi

F. J. Griffin, M. C. Pillai, C. A. Vines, J. Kaaria, T. Hibbard-Robbins, R. Yanagimachi and G. N. Cherr
University of California at Davis, Bodega Marine Laboratory, Bodega Bay, California

We investigated the effects of salinity on fertilization and early development in a population of Pacific herring, Clupea pallasi, that migrate from oceanic waters into the San Francisco Bay estuary to spawn. The salinity range for fertilization fell between 8 and 28 ppt, with an optimal range of about 12 to 24 ppt. In comparison, the range for a population of C. harengus membras (Airisto Sound, Finland) that reside year-round in the Baltic Sea was 4 to 24 ppt. Roles for both Na+ and K+ were indicated in C. pallasi fertilization since increasing Na+ in the presence of 10 mM K+ (concentration of seawater) mimicked the effects of increased overall salinity, whereas reduced effects were obtained if [K+] was held at 5 mM (that of half-strength seawater). The initiation of C. pallasi sperm motility by components of the egg chorion, a prerequisite for fertilization, was inhibited at both elevated (28 and 32 ppt) and reduced (4 and 8 ppt) salinities. Embryonic development through larval hatching in C. pallasi exhibited a salinity tolerance similar to that of fertilization; optimum development was obtained at salinities between 8 and 24 ppt. A comparison of developmental progression in 3.5, 14, and 28 ppt seawater revealed that salinity effects became evident during the post-gastrulation stages of development and that progression to hatching was delayed in both the lower and higher salinities for those embryos that completed development.


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