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Figure 2. — Number of releases of tagged spinner dolphins, Stenella longirostris, by 2-degree area, 1969-76. 

 Two dolphins given in Table 1 for which precise localities are not available are not included. 



tags released in 1969 and 1970 were yellow and bore 

 one of two legends (in addition to serial number) : 



a. RETURN TUNA COMM SAN DIEGO or 



b. REWARD BU COMM FISHERIES SAN DIEGO. 



2. Spaghetti tag with steel dart. This type of tag was 

 developed for use on large pelagic fishes (Mather 

 1963) and was first used on cetaceans by Sergeant and 

 Brodie (1969). It has been modified from its original 

 design by addition of a clear plastic sleeve to protect 

 the legend (Evans et al.1972). It is manufactured by 

 Floy Tag and Manufacturing, Inc., Seattle, Wash. 

 Four versions of the tag were used in the operations 

 described here: 



a. 15-cm long, orange, with legend: 



REWARD U.S. BUR COMM FISH LA JOLLA, 

 CALIF(CF) 



b. 12-cm long, yellow, with legend: 



REWARD NATL MARINE FISH SERVICE LA 

 JOLLA, CAL 



c. 32-cm long, yellow, with legend: 



NUC-502 SAN DIEGO, CAL. 92132 REWARD 



d. 30-cm long, orange, with legend: 



NATIONAL MARINE FISHERIES SERVICE 

 LA JOLLA, CA U.S.A. REWARD. 



3. Spaghetti tag with steel dart/braided. These tags 

 were designed at sea for use in underwater observa- 

 tions of tagged dolphins during the research cruise of 

 the Elizabeth C. J. in 1976 (see following section on 

 Chronological Account of Tagging Operations, 1969- 

 76). Three-strand braids of spaghetti tubing of various 

 colors were linked together in unique colorAength com- 



binations and fastened to steel-dart tags from which 

 all but 1 in of tubing (bearing the serial number) has 

 been removed. Six-inch lengths of Vi-in wide flexible, 

 bright orange plastic streamers were added to the ends 

 of some of the tags to further increase visibility. 



4. Plastic deer ear tag. This tag ("jumbo rototag") was 

 described and figured by Norris and Pryor (1970). Tag 

 and applicators are manufactured by Dalton, Henley, 

 United Kingdom. 



a. Tags released in 1971 were yellow and bore the leg- 

 end: 



DEVUELVA OF. DE PESCA PREMIO. 150 

 PESOS BU COMM FISH SAN DIEGO CON 

 CABEZA 



b. Tags released in 1972 were yellow, with the leg- 

 end: 



$15 DOLLAR REWARD FOR RETURN WITH 

 HEAD BU COM FISH SAN DIEGO 



c. Tags released in 1973 were white and bore no leg- 

 end other than the serial number. 



5. Radiotag. Martin et al. (1971) and Evans (1971, 

 1974) described and figured the radiotags used. 



CHRONOLOGICAL ACCOUNT OF 

 TAGGING OPERATIONS, 1969-76 



1. In 1969 and 1970, the Inter-American Tropical Tuna 

 Commission (IATTC) conducted tuna-tagging opera- 

 tions on three cruises on the chartered tuna seiners, 

 the Connie Jean and the Anne M. At NMFS' re- 

 quest, tuna tags (spaghetti tag with plastic dart — see 

 discussion of tag types above) were also placed in dol- 



