Key to the Species 



(i) Size large, central portion of first dorsal fin much less 

 than half body deptho Pectoral fins -.ong, roughly equal 

 to or slightly greater than body depth _, . . o o ., mitsukurii 



(2) Size small J length of rays in central portion of first 

 dorsal fin greater than half the body deptho Pectoi al 

 fin shortj, less than body depth o <. . . o o „ o <, o , , o formosana 



3o Kaiikia mitsukurii (Jordan and Snyder) 



Figure 20c ^-Striped marlin., 



In Japanese ka.ii-ki„ makajiki g nairagi , nairanbo ^ nairage g 

 akakahiki p or akac 



The first dorsal fin has 37 to 43 rays, of which the 3 most anterior 

 are spineso The succeeding 12 to 15 rays have branched tips, and the 

 remaining 22 to 25 posterior rays are spinyo The first anal fin has 2 

 spines and 12 to 25 soft rayso The second dorsal fin has 6 soft rays, 

 and the second anal fin has 6 soft raySo The ventral fins have 1 spine 

 and 2 soft raySo The vertebral count is 12 / 12 s 24o 



The body length is 5 to 5o5 times the greatest body depth, about 

 r^ times the body depth at the first anal fin, and 2^6 times the head 

 lengtho The head length is 1,5 times the snout length and about 6 times 

 the distance between the eye socketSo The length of the snout is about 

 4 times the length of the head excluding the snouto The head length 

 excluding the snout is about 4 times the diameter of the eyeo The 

 distance between the eye and the insertion of the first dorsal fin is 



4 times the diameter of the eye^ The greatest body depth is roughly 



5 times the depth at the caudal peduncleo The ratio of length of 

 upper jaw to lower jaw is I08 to lo9o 



The body is long and slender^ with the trunk conspicuously com= 

 pressed laterally, the caudal portion gradually assuming a cylindrical 

 form„ There are two keels on each side of the caudal peduncleo Body 

 depth is the greatest among the species of this subfamily, and in 

 external form this species rather closely resembles the fishes of the 

 subfamily Marlinaeo The body is covered with bony, slender scales 

 which are buried in the skin^ The lateral line is single, and it is 

 not clearly visible„ The lower jaw is rather long, the difference in 

 length between the upper and lower jaws being slighto 



The first dorsal fin is well developed^ the length of its longest 

 rays being somewhat greater than the body depth„ The highest portion 

 of the fin is divided into two parts, the profile of the intei-vening 

 portion of the fin being more or less concave„ The profile of that 

 portion of the fin immediately posterior to its longest rays decreases 



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