coasts of Luzon they appear in the latter part of Marchj and from 

 April to May the density of the schools is greato It appears that in 

 late May and early June the schools in this region move into the area 

 of the Kuroshio and go rapidly northwardj, disappearing from this 

 region^ The spawning season of the schools in the waters adjacent to 

 Japan is thought to be around July, but in the Formosa region the 

 schools spawn in April - May, 



Looking at the migrational pattern in the Japanese coastal 

 waters, the migrations of the albacore and the spearfishes follow that 

 of this speciesj, and when these fishes appear, the tuiia season is 

 drawing close to its endo In their northward migration the schools 

 approach close to the coast and generally swim in the surf?ice layero 

 In the autumn when the water temperature begins to fall they turn south- 

 ward againj; but at this time they swim offshore in rather deep layers„ 



They are vora;cious by nature, and feed on planlrtonic crustaceans, 

 squidj and small fish such as sardines, mackerel, and frigate mackerel,, 



These fish are also said to occur in the Hawaii and California 

 regions, inhabiting a wide range of water temperatures of 5° - 28°c 

 The most favorable temperatures in Japanese waters are thought to be 

 10° " 15° Co 



This species is thought by scholars to be the same as the 

 Atlantic To thynnu s (Linnaeus) and this name is applied to ito It may 

 very vfell be the same species, but the author thinks that the decision 

 requires a thorough comparative study with specimens from the AtlantiCo 



Germo Jordan 1888 



The pectoral fins are very long, far exceeding the head length 

 and reaching to at least the second dorsal finleto They are ribbon- 

 like rather than sickle-shaped in fonrio The length of the second dorsal 

 and the anal is moderatco The gill-raker count in the majority of 

 cases is 9 / 18 s 27o One species of this genus occurs in Japanese 

 waterso 



Figure 8o -- Thunnus germOo 



2o Germo germo (Lacepede) 



This fish has the common names binnaga , binchOg hirenaga , 

 tombo (or tomboshibi )o 



First dorsal with 14 spines, second dorsal with 14 rays, 

 dorsal finlets, anal with 14 rays, 8 anal finlets, gill-rakers 

 9 / 18 - 19o Number of scales in one longitudinal row about SlOu 



28 



