COMPARATIVE STUDY OF SCOMBROID FISHES. 
421 
of small greyish spots along the lateral median line. Fins blackish, ventrals 
and anal finlets excepted. 
It is remarkable that this fish spawns at the mouth of Daidökö, near 
Chinnanp} in July, and. the immature fish is caught in stow nets near the 
port, in August and September. Grows to a leugth of more than one and. a 
half metres, and about fifteen kg in weight. Matures when the fish is 
about 2.25 kg in weight and 75 cm in length. At Chinnanpo the water 
is turbid, of a brownish colour, and in warm seasons its density at 15° C is 
1.9126—1.0164 near the surface, and 1.0166—1.0182 near the bottom. 
So far as we know the distribution of this species is limited to the west 
and south coasts of Chosen. 
Caught in summer and autumn with drift nets or in pound-nets. The 
fishery of this fish in Daidökö was begun by Japanese fishermen siuce 1917. 
It feeds on sardines, anchovies and shrimps. 
Very nice food fish ; but becomes inferior in the spawning season. 
Cybium niphonium Schlegel. 
Sawara, sagoshi. 
Figs. 6, 9, 32, 41. 
? Cybium niphonium , Cuv. & Val., Hist. Nat. Poiss., VIII, 180, 1831. 
Cybium niphonium, Schlegel, Fauna Japon. Poiss., 101, Tab. 53, Fig. 2 ; Kishinotiye, Sui. 
Oak. Ho, I, 10, PI. 1, Fig. 4, 1915. 
Scomberomorus niphonius, Tanaka, Fish Japan, I—X, 154, Pis. 42, 44, 1912. 
D. 19, 15, 9. A. 15-17, 8. Gill-rakers 3+9-10. Vert. 22 + 28. 
Body slender, elongated, and compressed, covered with such minute scales 
that they are not skipped before cooking. Corselet indistinct. First dorsal 
very long, and its dorsal outline is of very slight slope. Pectoral concave at 
the inferior posterior margin. Lateral line undulating, and has a marked 
curve below the second dorsal. Many small branch-canals are found on both 
sides of the lateral line, but they are not so distinct as in G. guttatum and 
G. Jcoreanum. Teeth in jaws lanceolate, curved, and trenchant, about 25 in 
the upper and about 20 in the lower jaw. They are a little smaller than 
those of other species. Villous teeth on the vomer and palatines, but none on 
the tongue. Only one gill-raker on the second gill-arch. 
