|Document Type:||Contract Report|
|Title:||A record of the development of the shad egg Alosa sapidissima|
|Author/Editor:||Theodore H. Blahm, William D. Parente|
|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.