COMPAR.Vrn^E STUDY OF SCOIIUROID FISHES. 



387 



Aomori-ken. Tliis specimen is nearly tlie siuue as the preceding one, but it 

 is a little hruader. 



An immature fish of Acaiuhocyhium solandri, 27 cm. in the total length, 

 was caught oft' Daicsaki, Miye-ken, in September 1917. It has about twenty 

 transvei-se bjmds. Tho.se in the precaudal region fade away neai" the venti-jil 

 nutliiin line, but in tlie caudal region they are manifest from the back to the 

 ventral media u hne. 



The growth of timnies seems to be veiy rapid. The common tunny, 

 Tlinnnvs wientalis, most probably reaches umturitj- in the third year of age. 

 Thunmifs oriadah's, ca 22 cm in the total length, is the smallest specimen I 

 have stcu. It lias ton t<j fifteen faint ti'ausveise bands which fade toward the 

 ventral median line. These transverse bands are divided into two at the 

 venti^sU jKirt. Such small individuals are found in Augast and in September. 

 Som-} of them giv>w to a length of 30 cm or more. By nest spring they 

 grow to a length of ca 60 cm (fig. 43). When two years old they are about 

 one meti-e in length and eleven kg. in weight. Thi-ee years old fish is con- 

 sidered to weigh about fifteen kg. The growth of Tlmnnus gerrao and Neothunnvs 



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Fig. V. Euthynnus yaUo (immnture). 2/3. 



