FUKUSHIMA, SHIN-ICHI--Con. 



North-eastern Sea area of Japan. Bull. 



Tohoku Reg. Fish. Res. Lab. 7: 12-36. 



(In Japanese with English summary.) 

 The size composition of the Pacific saury during its 

 southward migration in the Northeastern Sea area of Japan 

 during the fishing season (September to December) was 

 studied. Length-frequency data from commercial catch 

 samples showed that size vary considerably from year to 

 year and between different fishing areas in one season. 

 The author concluded that complex migration patterns 

 persist and are probably regulated largely by prevailing 

 oceanographic conditions. 



1958. Relation between the fishing of the 

 Pacific saury and the oceanographical 

 conditions in the Northeastern Sea area 

 along the Pacific coast of Japan. Bull. 

 Tohoku Reg. Fish. Res. Lab. 12: 1-27. 

 {In Japanese with English summary.) 

 Relations between saury catches and oceanographic 

 conditions were reported for 1949-57. The following con- 

 clusions were drawn: (1) catches were made in waters 

 between 7° and 24° C; (2) maximum catches were taken in 

 waters between 14° and 18° C; and (3) high water tempera- 

 tures in the summer, adjacent to the Sanriku District, re- 

 sulted in good fishing, but low water temperatures in the 

 summer in this area resulted in poor fishing. Three water 

 types and the resulting fishing conditions are discussed. 



1962. On the relation between the pattern 

 of the Kuroshio Current in spring and 

 summer and the saury fishing conditions 

 in fall. Bull. Tohoku Reg. Fish. Res. 

 Lab. 21: 21-37. (In Japanese with Eng- 

 lish summary.) 

 The author describes five different oceanographic con- 

 ditions that have occurred during the spring and summer 

 south of Cape Shionomisaki, Japan, between 1951 and 

 1961. Using relation between these oceanographic con- 

 ditions and the catch records, he can predict the saury catch 

 during the autumn as very good, good, or poor. 



FUKUSHIMA, SHIN-ICHI, and AKIRA 

 NAGANUMA. 

 1956. On the thickness-coefficient of the 

 saury, Cololabis saira . Bull. Tohoku 

 Reg. Fish. Res. Lab. 7: 37-53. (In 

 Japanese with English summary.) 

 The thickness coefficient (f = l,000w/l^ where f is the 

 thickness coefficient, w is the body weight, and 1 is the 

 body length) is greatest early in the fishing season and 

 decreases as the season progresses. During the seasonal 

 migration, the thickness coefficient decreases as the saury 

 move north to south. There is a negative correlation 

 between degree of sexual maturity and the thickness coef- 

 ficient so that the thickness coefficient is smallest just 

 before spawning. During 1951-54, the condition coefficient 

 of small, medium, and large saury was compared during 

 the migration cycle. 



HATANAKA, MASAYOSHI. 



1956a. Biological studies on the population 

 of the saury, Cololabis saira (Brevoort). 

 Part I Reproduction and growth. Tohoku 

 J. Agr. Res. 6: 227-269. 



This paper is a comprehensive report on reproduction 

 and growth of the Pacific saury that inhabit the waters 

 surrounding the Japanese Archipelago. The topics dis- 

 cussed in detail are: maturity and spawning, distribution 

 of eggs and larvae, larval development, age determina- 

 tion, growth process, and condition factor. 



Reviewer's note: The reported theories on age of saury 

 are now believed incorrect. 



1956b. Biological studies on the population 

 of the saury, Cololabis saira (Brevoort). 

 Part 2 Habits and migrations. Tohoku 

 J. Agr. Res. 6: 313-340. 

 Behavioral and migrational patterns are presented and 

 correlated with fluctuations in the Japanese saury catches. 

 The following topics are discussed in detail: feeding 

 habits and biological environments, migrations, and bio- 

 logical features of the commercially caught saury. Pre- 

 vailing oceanographical conditions that affect migration 

 patterns are believed primarily responsible for the large 

 fluctuations in catch rates. 



HOTTA, HIDEYUKI. 



1958. On the growth of the young saury, 

 Cololabis saira in the rearing experi- 

 ment. Bull. Tohoku Reg. Fish. Res. 

 Lab. 11: 47-64. (In Japanese with Eng- 

 lish summary.) 

 The digestive system of the saury is composed of a 

 straight intestine and no stomach. The maximum food 

 consumption of a young saury at one feeding is 13 percent 

 of the body weight. The relation of fullness to body weight 

 is given by the formula Sw =0.128 w'^*^^^ where Sw is the 

 food weight in grams and W is the body weight in grams. 

 At water temperatures between 15° and 21° C, a 12-cm. 

 saury requires 9 to 10 hours to digest completely the 

 contents in its intestines. A 6-cm. saury will grow to 

 20 cm. within 6 months. The length-weight relation of 

 commercial-sized saury is W = 0.000916 l3.468 where W 

 is weight in grams and L is length in centimeters. 



1960. On the analysis of the population of 

 the saury ( Cololabis saira ) based on the 

 scale and the otolith characters, and 

 their growth. Bull. Tohoku Reg. Fish. 

 Res. Lab. 16: 41-64. (In Japanese with 

 English summary.) 

 Studies on the body weight, body length, scales, and 

 otoliths of commercial saury revealed that the popula- 

 tion is composed of two subpopulations, spring- and 

 fall-spawning saury. Both groups are made up of two 

 sizes and two ages. The spring-spawners are composed 

 of giant saury (modal weight of 155 g. and modal length 

 of 32-33 cm.), and medium-size saury (85-95 g. and 

 27-28 cm.). The fall spawners are composed of large fish 

 (135 g., 30 cm.) and small fish (45 g., 21-24 cm.). Giant 

 saury are 2-1/2 years old; large saury, 2 years old; 

 medium saury, 1-1/2 years old; and small saury, 1 year 

 old. Differences in the scales and otoliths of the spring- 

 and fall-born saury are also discussed. 



1962. The parasitism of saury ( Cololabis 

 saira ) infected with parasitic copepoda, 

 Caligus macarovi Gussev, during fishing 

 season in 1961. Bull. Tohoku Reg. Fish. 



