224 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



YABE, HiROSHi, and TOKUMI MORI. — Continued 



Katsuwonus pelamis, Neothiinnus macrop- 

 terus: ecologry; live-bait fishing; yellowfin 

 length frequencies. 



Yabuta, YOichi. 



1953. On the stomach contents of the tuna and 



marlin from the adjacent seas of Bonin Islands. 



Contrib. Nankai reg. Fish. Lab. 1, Contrib. 



15:6 p. [J,P] 



Lists and gives numbers of organisms 

 found in 76 longline-caught albacore, big- 

 eye, and yellowfin tuna stomachs (no 

 volumes); describes food organisms; dis- 

 cusses seasonal differences in stomach 

 contents, relation to oceanographic condi- 

 tions; young skipjack as food. 



Yabuta, YOichi and Shoji ueyanagi. 



1953a. The distributions of tunas in the equatorial 

 region. I. Contrib. Nankai reg. Fish. Res. 

 Lab. 1, Contrib. 28:8 p. [Je,P] 



Distribution and migration of yellowfin, 

 bigeye, and black marlin in southern Mar- 

 shalls area as shown by longline catch 

 rates of mothership fleet; seasonal 

 changes in size composition of yellowfin; 

 fishing conditions correlated with oceano- 

 graphic conditions. 



1953b. The distribution of tunas in the equatorial 

 region. II. Hooked-rate of yellowfin tuna. 

 Contrib. Nankai reg. Fish. Res. Lab. 1, Con- 

 trib. 29:6 p. [J,P] 



Longline catch rates of yellowfin tuna 

 from mothership fleet operations in south- 

 em Carolines waters related to locality, 

 hydrography, time, and size composition. 



Yamamoto,, Shigeo. 



1933. Points of information for the skipjack fish- 



Yamamoto, Shigeo. — Continued 



ery gained from the study of fish's eyes. 

 Rakusui 28(11) : 927-930. [J] 

 Skipjack: anatomy. 



1934. Points of information for the skipjack fish- 

 ery gained from the study of fish's eyes. 

 Rigakkai 32(1):28. [J] 

 Skipjack: anatomy. 



YAMAMOTOj Shokichi. 



1940. Views on increasing the commercial value 

 of dried fish sticks from the South Seas. 

 Nanyo suisan 3(11) : 21-35. [J,P] 



Skipjack: Japan, Formosa, South Seas; 

 proportional weights of various body 

 parts. 



yamanakAj Ichiro. 



1950. On the size composition of skipjack in the 

 Northeastern Sea area. Nippon kaiyogakkai 

 Shi 5(214). [J] 



Yonezavva, Matsunosuke. 



1950. Skipjack fishing experiences. Kaiyo no 

 kagaku 6(1) :47-49. [J] 



Skipjack, Japanese waters. 



Yoshihara, Tomokichi. 



1951-52. Distribution of fishes caught by the long- 

 line. I. Horizontal distribution. II. Vertical 

 distribution. III. Determination of the swim- 

 ming depth. Bull. Jap. Soc. sci. Fish. 16(8) : 

 367-369; 16(8) :370-374; 18(5) :187-190. [Je,P] 

 Statistical study comparing catch rates 

 on different parts of longline sets; rela- 

 tive swimming depths of Germo germo, 

 Parathunnus sibi, and spearfishes deduced 

 from estimated depths of hooks on which 

 captured. 



Zei, M. 

 1948. 



zivot naseg Jadrana. 220 p. 

 Tuna, Adriatic Sea. 



