COMPARATIVE STUDY OF SCOMBROID FISHES. 
393 
Table showing the temperatnre of water in which 
scombroid fishes are found. 
5° 
10 ° 
15 ° 
20 ° 
25° 
30° 
Table showing the vertical distribution of scombroid fishes. 
0 20 m 40 m 60 m 80 m 100 m 120 m 
Scomber japonicua 
Cybium niphonium 
Th unnus gerrno 
Thunnus orieutalis 
Parathunnua mebachi 
Neothnauus macropterus 
Katsuwonuf pela mis 
Auxis hira 
The salinity of the water, most suitable for our scombroid fishes, differs very 
greatly for different species. Generally speaking fishes of the Scombridae and 
Cybiidae are adapted to water of lower density, 1.022—1.025, while plecostean 
fishes prefer water of higher density, 1.025—1.027. Gijbium Jcorecinum can 
withstand water of very low density. Of the Katsuwonidae, species of Auxis 
are sometimes found in littoral waters of low density. 
