Fvirthermores, this view is strengthened by the fact that in 

 actuality skipjack schools are not seen in this sea area 

 during winter j nor are they caught there (they are taken 

 rarely on the longlines of the winter tuna fishery in the 

 warm=wator area far to the eastj, but are hardly to be seen 

 off 3anriku)o 



(Table of the month in which the peak of the catch of 

 each size of skipjack occurs ^umber of fish and number 

 of times in percentage^^ 



Notes § On the skipjack which are taken in the winter 

 longline fishery for tuna<, The skipjack which are taken in 

 small numbers together with albacore by vessels of this 

 prefecture from late winter to early springs (a) are taken 

 from November to the first part of April of the following 

 yearj being most commonly taken from December to Marchj, and 

 being particularly nimierous in Marchj (b) fishing grounds are 

 the same as those for albacore (a report on albacore will be 

 published at a later date)| (c) catches are made at surface 

 tenperatures of 17° to 22°a a 5° spreadj the most favorable 

 ten^eratures are 18° to 19 g the same as for albacorei (d) the 

 fish are all of large size^ occasionally attaining a weight 

 of UO pounds o Such fish are taken at this season on longline 

 gear east of Cape Nojima at depths of less than ^0 fathoms 

 under the same oceanographic conditions in which albacore are 

 takenj but such questions as which stock these "year-round 

 skipjack" belong to and why they pass the year in northern 

 waters must wait upon data to be gathered in the future o The 

 fact is simply recorded here for future reference o 



This paper is based to a large degree on the published 

 researches of Technician Uda of the national fisheries experi- 

 ment stations and is also based on the ideas of Technician 

 Aikawa of the same stationo I take this opportunity of express- 

 ing my thanks to these two per sons o 

 (Technician Takeo Sasaki) 



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