60 



DIVISION OF PISH AND GAME 



BLUEFIN TUNA 

 Tbunnus thynnus 



Relationship: Belongs to the tuna family, Thunnidn 

 yellowfin tuna and the albacore. 



which also includes tiio 



Distinguishing Characters: The series of finlets following both the dorsal and 

 anal fins, usually eight after the dorsal and seven after the anal ; the short pectoral fin 

 which extends normally only to the eleventh or twelfth dorsal spine and is shorter 

 than the head ; the i-ound vent ; the rounded edges of the gill covers ; the entire ventral 

 surface of the liver striated radially with blood vessels. Reaches a weight of about 

 250 pounds in California waters. Atlantic bluefin reach 1,600 pounds and a length of 

 about 14 feet. May generally be distinguished from the albacore, yellowfiu and big-eye 

 tunas by the relatively short pectoral fin. Further, the vent is oval in the latter two 

 species. Color: Deep blue above ; silvery on the sides and belly ; the belly with irregular 

 white spots. Lacks the golden yellow band along the sides and the black edging of the 

 finlets found on the yellowfin tuna when caught. 



Distribution: On our coast from the Columbia River to Guadalupe Island, 

 Mexico ; not common north of Pt. Conception. As far as is known at present, it belongs 

 to the same species as is found in other parts of the world. A schooling fish. 



Fishing Season: Usually reaches a peak between May and August. Only vei\v 

 occasional catches are made during the winter months. Fished in both California and 

 Mexican waters. 



Importance: Sixth in the State in poundage and value during 1946. Los Angeles 

 is the leading port of landing, followed by San Diego. A prized game fish. 



Fishing Gear: Purse seines (commercial) ; hook and line (sport). 



Unauthorized Name: Leaping tuna. 



