Subject: Tests co Dotcnai^.e the T-.me Factor in the Floating of Dead 

 Salmonoid Fishes, Bonneville Dam, 1945, (Continued) 



Bags of No. 32, soft laid seine twine were made up in both 4- and 6- 

 ino'n stretch mesh, of which the 4'-inch mesh proved to be the most 8atis= 

 f'actoryo The bags were made large enough and long enoagh to accommodate 

 the largest fish used, and the exces.-; length disposed of when smaller 

 specimens were used. The greater circumference of the bags did not seem 

 to hinder the holding of the smaller fish. 



The desired specimens were secured at the Washington Shore trap, and 

 killed with the least possible damage to the fish., The specimens we;~e 

 immediately placed in their bags and deposited in the holding area ;,.ocated 

 along the Bradford Island side of the spillway f orehaj . The holding area 

 was not only accessible, but provided water of sufficient depth and quiet"» 

 ness to carry on the work. Total lengths of the specimens were taken, and 

 the time they were placed in the water notedo Observations were made on 

 the length of time it took them to float, hov; many floated, a:';d how long 

 they remainded at the surface. Notes were also kept on the physical appear- 

 ance of the dead fish. The test was carried out a second time to check the 

 results of the first test. 



OBSERVATIONS 



Part 1 



In this part of the tests, 11 chinook salmon were used. The essential 

 information is found in the follovidng table; 



Speci- Total Placed Found Found on Time Required No. of hrs 



men Length in Water Floating Bottom to Float Floated 



(in hours) 



1 I'B 1/2" 3:00 pm 2 -00 pm 4;00 pm 



18 July 21 July 27 July Tl 146 



2 2»3" 3:00 pm 2:00 pm 3 s 30 pm 



18 July 21 July 30 July 71 217 l/2 



3 2'3 1/2** 3:00 pm 2 :00 pm 4 ;00 pm 71 266 



18 July 21 July 1 August 



4 I'lO'* 3:00 pm 8:15 am 5:00 pm 113* 152 3/4 



18 July 2 3 July 29 July 



5 I'lO l/S** 3:00 pm 2 :00 pm 3:30 pm 71 165 l/2 



18 July 21 July 28 July 



6 1«9 1/2^ 3:00 pm 2 :00 pm 3:30 pm 71 165 l/2 



18 July 21 July 28 July 



f qw 



3 ',00 pm 2 :00 pm 8:15 am 71** 42*** 



18 July 21 July 23 July 



I'g" 2:00 pm 8:15 am 5 -00 pm 90 153 



19 July 23 July 29 July 



37 



