FISHERY BULLETIN: VOL. 80. NO. 1 



Figure 2.— A. Single bolt visual tag held by Teflon bolt and cotter pin. Note tag bolt scar from 1970-71 study. B. Double bolt tag, 

 Roto tag (at top rear of fin), and spaghetti tag (lower right). C. Double bolt tag on free-swimming dolphin. Note freeze brand with 

 incomplete left digit on body below fin. D. Algae-covered tag 2 mo after initial installation. Note indented area of skin where 

 water flow against tag on opposite side of fin caused pressure on near side. Note also discolored tissue around forward bolt hole. 



TABLE 1.— Comparison of tagging techniques. 



'Length of time tag was attached and identifiable. 

 2 Many were redone or "touched up " 

 'Recognizable dorsal fins. 



numbers on the tags were too small to be read 

 from the observation boat, but the color codes 



138 



were useful for recognition of sex, and the 

 positions of a tag often indicated identity. 



