Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 9154
Title: A record of the development of the shad egg Alosa sapidissima
Author/Editor: Theodore H. Blahm, William D. Parente
Publication Year: 1970
Publisher: Bureau of Commercial Fisheries Seattle Biological Laboratory
Contracting Agency: U.S. Environmental Protection Agency.  Columbia River Thermal Effects Study
Keywords: shad eggs, thermal effects, Columbia River,

Shad fry Alosa sauidissima were planted in the Columbia, Willamette and Snake Rivers in 1885.  The Columbia River has since become one of the principle shad producing rivers in North America.  Shad spawn in the Columbia River from May through September.  The fertilized egg is approximately 3.5 mm in diameter and hatching occurs in about 10 d, depending on water temperature.  References in the literature on egg development of Columbia River shad are limited.  The purpose of this paper is to present a record of the development of shad eggs.