Validation of a Critical Assumption of the Riparian Habitat Hypothesis for White Sturgeon

Scientific Investigations Report 2006–5225

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5225

Table 2. White sturgeon embryos collected in the Columbia River near Ives and Pierce Islands.

[Numbers represent embryos collected at all sites combined. Embryos are divided into stages based on Beer (1981)]

Stage	Stage name	No. of eggs
1	Unfertilized egg	0
2	Changing pigmentation	55
3	First cleavage	3
4	Second cleavage	6
5	Third cleavage	13
6	Fourth through sixth cleavage	78
7	Late cleavage	38
8	Early epithelial	17
9	Late epithelial	10
10	Involution	22
11	Large yolk plug	51
12	Small yolk plug	1
13	Early neurulation	10
Mort	Damaged or dead embryo	23