McCabe and Tracy: Spawning and early life history of Acipenser transmontanus 



767 



Table 3 



White sturgeon, Acipenser transmontanus, egg (freshly fertilized) catches and accompanying physical measure- 

 ments for the index site near rkm 230 in the lower Columbia River, 1988-91. Water temperatures (on site), turbidities, 

 and bottom velocities were measured just above the bottom; Bonneville Dam flow was the average of the hourly 

 discharges at the time of sampling and during the three hours prior to sampling. 



Velocity (m/s) 



Date 



Temperature 

 CO 



Turbidity 



(ntu) 



Bottom 



Mean column 



Dam flow 

 (m 3 /sx 1,000) 



No. eggs 



Eggs/ 

 1,000 m 3 



1988 



25 Apr 



5 May 



10 May 



18 May 



23 May 



2 Jun 



8 Jun 



16 Jun 



20 Jun 



29 Jun 



1990 



23 Apr 

 30 Apr 

 7 May 

 14 May 

 22 May 



29 May 



5 Jun 

 11 Jun 

 18 Jun 



25 Jun 



2 Jul 

 9 Jul 



18 Jul 



1991 



30 Apr 



6 May 



14 May 

 20 May 

 29 May 



3 Jun 



19 Jun 



26 Jun 

 3 Jul 

 9 Jul 



15 Jul 



10 



11 

 13 

 13 

 14 

 14 

 14 

 16 

 16 

 17 



11 

 11 

 12 

 12 

 13 

 14 

 15 

 15 

 15 

 17 

 is 

 19 

 20 



10 

 11 

 12 

 12 



11 

 14 

 16 

 15 

 18 

 19 



1!) 



4.5 

 6.4 

 6.0 

 6.0 

 5.4 

 6.0 

 3.5 

 3.5 

 3.2 

 3.1 



3.0 

 3.5 

 3.9 

 3.7 

 3.0 

 3.0 

 3.4 

 6.5 

 5.6 

 3.7 

 2.2 

 1 9 

 2.0 



3.6 

 3.0 

 4.2 

 5.3 

 6.3 

 11.5 

 4.2 

 3.7 

 4.3 

 2.8 

 3.5 



1.0 

 1.4 

 1.0 

 1.2 

 1.2 

 1.4 

 1.4 

 1.1 

 1.1 

 1.0 



1.1 

 1.1 



1.7 

 1.8 

 1.1 

 1.4 

 1.7 

 1.5 

 2.1 

 1.7 

 1.2 

 1.1 

 1.1 



1 3 

 1.3 

 1.4 



2 1 

 1.5 

 2.1 

 1.4 

 ] 1 

 1 7 

 1.2 

 1.0 



1 5 

 1.8 

 1 6 

 1.6 

 2.1 

 2.3 

 2.0 

 1.8 

 1.5 

 1.6 



1.5 

 2.2 

 2.6 

 2.3 

 1.7 

 2.3 

 2.5 

 2.4 

 2.7 

 2.5 

 2.1 

 2.2 

 1.8 



2 1 

 2.1 

 2.0 

 2.6 

 2.6 

 2.6 

 2.5 

 2.2 

 2.4 

 1.6 

 1 s 



3.89 

 5.14 

 5.95 

 6.24 

 5.59 

 6.51 

 5.43 

 4.50 

 4.17 

 3.90 



6.61 

 7.20 

 7.57 

 7.03 

 4.69 

 5.90 

 8.32 

 9.07 

 9.01 

 7.52 

 6.71 

 5.56 

 4.25 



7.67 

 6.80 

 6.81 

 9.60 

 8.79 

 9.10 

 7.39 

 7.36 

 7.38 

 5.55 

 5.40 



3 

 24 

 80 



4 



1() 

 is 

 19 



(i 

 9 











225 



32 



292 







39 



L9 



23 







2 



1 



i) 

 o 





 2 



98 



L5 

 2 



11 

 



12 

 9 

 

 



1.7 



19.5 



54.1 



2.1 



6.4 



10.3 



12.4 



0.0 



6.9 



0.0 



0.0 



133.2 



14.8 



166.9 



0.0 



25.6 



10.0 



12.9 



0.0 



11 



0.5 

 0.0 

 0.0 



0.0 

 1.2 

 56.5 

 14.4 

 1.4 

 7.1 

 0.0 

 7 5 

 5.2 

 0.0 

 0.0 



