"*<* 



TV system poised on the south rail track and ready for 

 lowering. The attached 36- by 48-inch grid is divided 

 into 6-inch squares. This is used as a reference in water- 

 motion studies. The grid serves as a background scale 

 in the study of fish sizes and is used to determine rate of 



Fish are identified on the TV monitor by 

 their shape, markings, and behavior. Kelp 

 bass, with light spots on the dorsal side, 

 move rapidly through the light field. 



1 







1 









' i 

 1 













^^ 











7i 







L - 





- 





Underwater, the white nylon yarn streamers 

 indicate current movement. The perch in 

 foreground is 9 inches long. Mackerel in 

 background are tower residents during 

 winter. 



Railway tracks extend from main deck on 

 the west side and from the second deck 

 on the north and south sides. Carts are held 

 firmly to the track by roller-type shoes 

 which permit the cart to be moved freely up 

 and down the track. 



127 



