296 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Table 7. — Frequencies of egg diameters, in micrometer units (upper figure) 

 [Asterisks mark modal diameters] 



Ovary number 



200. 

 184. 

 318. 

 290. 

 276. 

 353. 

 179. 

 264. 

 300. 

 32.. 

 181. 

 314. 

 156. 

 41.. 

 305. 

 209. 

 256. 

 257. 

 88.. 

 116. 

 159. 

 251. 

 246. 

 259. 

 153. 

 74.. 

 185. 

 158. 

 275. 

 130 

 79.. 

 75.. 

 80.. 

 122 

 174, 

 15.. 

 277 

 274 

 110 

 91. 

 82.. 

 123 

 84.. 

 90. 

 269 

 18.. 

 145 

 165 

 42.. 



175 



142 

 57 

 60 



125 

 32 



114 



105 

 92 

 64 

 75 

 62 

 75 

 58 

 85 

 43 

 66 

 57 

 46 

 74 

 71 

 72 

 62 

 62 



215 



259 

 77 

 35 

 87 

 86 

 76 

 87 



105 

 53 

 61 

 81 



102 

 82 

 61 

 49 

 87 

 67 

 72 

 44 

 32 

 61 

 189 

 86 



104 



119 

 100 

 37 

 36 

 79 

 15 

 61 

 66 

 53 

 31 

 48 

 38 

 59 

 36 

 48 

 24 

 35 

 31 

 41 

 59 

 45 

 42 

 38 

 30 

 151 

 137 

 44 

 24 

 43 

 54 

 55 

 57 

 51 

 33 

 37 

 30 

 54 

 44 

 30 

 28 

 37 

 35 

 40 

 32 

 22 

 41 

 94 

 63 

 58 



18 



.301 



4 

 10 

 8 

 19 

 18 

 16 

 16 

 20 

 *22 

 21 

 11 

 18 

 8 

 17 

 32 

 11 

 16 

 22 

 23 

 24 

 30 

 88 

 75 

 16 

 23 

 16 

 16 

 17 

 22 

 27 

 19 

 19 

 30 

 15 

 16 

 13 

 23 

 23 

 18 

 25 

 19 

 12 

 20 

 66 

 29 

 18 



ai 



.334 



27 



.451 



28 29 

 .468 .484 



31 



.518 



1 No measurements were made on 7 of the 11 early developing ovaries with the exception of noting the maximum egg diameters; none exceeded 0.23 mm. 



CENTRAL EQUATORIAL PACIFIC 



While the vast region of the tropical Pacific is 

 here treated as a single unit because of the small 

 amount of data available, it is realized that a 

 more detailed study of smaller units of area would 

 be desirable. 



The albacore caught in the equatorial Pacif- 

 ic (fig. 9) were intermediate in size between 

 those from the North Pacific and those from 

 Hawaii. If only the female fish are consid- 

 ered, however, their sizes were not much smaller 

 than the female fish sampled from Hawaiian 

 waters. One notable difference was in the sex 

 ratio, which in this region was nearly 1:1, while 

 in Hawaiian waters the males predominated (fig. 7). 



Ovaries from 66 fish were examined. Of this 

 total, 54 were in the early developing and 12 



were in the. late developing stage (table 8). In 

 figure 10 the maximum egg diameter of each of 

 the 66 ovaries is shown by date of capture of the 

 fish. Maximum egg diameter was used, because 

 no other measurements were made on most of 

 the early developing ovaries. Most of the sam- 

 ples were collected during February and Novem- 

 ber 1952, in February and May 1953, September 

 1956, and January and February 1957. Some 

 late developing ovaries were found during all of 

 these periods with the exception of February 1952. 

 The areas from which late developing ovaries 

 were obtained are also indicated in figure 1. They 

 appear to be randomly scattered. It is evident 

 that no conclusions can be drawn from the amount 

 of data available regarding the spawning time 

 and locality. 



