NO. 1 SEALE : REPORT ON FISHES 17 



by the bright yellow spots on the sides. Their usual length is about 760 

 mm. This species is known locally as Spanish Mackerel, Cero, Sierra, 

 Spotted Mackerel. 



Scombridae Mackerels 



Pneumatophorus diego (Ayres) 



One from Tagus Cove, Albemarle Island, Galapagos, January 14, 

 1934. Length 152 mm. Several schools of the common mackerel were 

 seen in the Galapagos. It is probable that the proper name for this fish is 

 Scomber scomber Linnaeus, as we have examined specimens from many 

 seas and found no specific differences. 



Katsuwonidae Skipjacks 

 Katsuwonus pelamis (Linnaeus) 



Numerous specimens of this Ocean Skipjack were taken in the Gala- 

 pagos Islands in January, 1932. The average length was about 650 mm. 

 This species may be distinguished by the 5 distinct stripes on the lower 

 sides, none on the back. In life there are purplish bars over the back, 

 which disappear after death. This fish is also known as Ocean Bonita, 

 Striped Tuna, and Skippy. 



Euthynnus lineatus Kishinouye 



One from Tower Island, Galapagos, January 22, 1932. Length 415 

 mm. This species is known as the Black Skipjack and may be distinguished 

 by the dark stripes on the back and the 3 or 4 round dark spots below the 

 pectoral fin. It may also have 3 or 4 stripes on the sides, but these fade 

 soon after death. 



Thunnidae Tunnies and Bonitos 

 Sarda lineolata (Girard) 



Specimens of this California Bonita were taken in the Galapagos and 

 at Cocos Island. They may be distinguished by the 10 dark lines that 

 extend upward and back on the sides of the body. 



Neothunnus macropterus (Temminck and Schlegel) 



The Yellowfin Tuna was common among the islands of the Galapa- 

 gos, where it may be taken on the hand line. It reaches a weight of 450 

 pounds. When first taken from the water, it is one of the most gorgeous 

 of fish, being deep blue above, silvery below, with a wonderful flush of 



