fishes nero found. On all cruisos these saino itoms •.7GrG found in large 

 numbers in the stomachs of Galeus glaucus and P."-.? K'' J^'il-is ^er ox shoeing t'lat 

 food is rather abundant in the North Central Pacific , 



From the averages for each voyago of the relatj onships between the 

 longth, circaTiference, and weight of the fish it was fo'ind that on the first 

 cruise the females had greater v/eight for theii-^ lengthy Ot the second 

 cruise this value was greater for the males and on the third cruise it was 

 slightly greater for the males. The average weight of the fish was 

 greatest on the first cruise followed by the third and second in that order. 

 It appeared that with small fish the males were heavier in relation to their 

 length while vdth larger fish the females shovjed a higher weight-length 

 value. There was no great variation in the ratio of weight to girth and it 

 appeared that there is after all only a certain amount of difference due to 

 the form of the fish. 



(b) Plankton Investigations 



Although a standard quantity plankton net had been ordered the previous 

 year for use in this investigation, it was not ready in time to bo used 

 on the first and second cruises. The not was finally employed on the third 

 cruise, but because of the delay the quantitative study was abandoned and 

 only the species were investigated. It was found, hovvevor, that in general 

 plankton was present in the greatest quantity on the third cruise, ,1s 

 Table 9 shows, more species were collected than in the previous year, 

 particularly of diatoms. On all three cruises warm wat;r and cold water 

 forms as well as those which appear in both warm and cold water were included 

 in the hauls, and they evidenced the fact that the best fishing groiands are 

 found at lines of discontinuity where v;arm and cold waters are mingled, 



(c) Sexing ilbacore and a Svdraming Habit 



Those fish which immediately after capture had bright shiny eyes, sorae- 

 7;hat rounded tips on their pectoral fins, and fusiform bellies v/ere mostly 

 males, 7;hile those which had rather dull eyes, sharply pointed pectorals, 

 and rounded bellies were for the most part females, however, it ;/as 

 difficult to distinguish the sexes accaratoly. Seventy or eighty per cent 

 of the fish were hooked in the left cheek, indicating that they circle to 

 the right in feeding. It is V70ndcred -.vhether sardines may not generally 

 have the habit of circling to the right. 



(d) Investigation of the Number of Live and Dead Fish 



^ Records were kept throughout this operation on '''heth-.r the albacore were 

 alive or dead when the lines were haulec' in. On all branch lines live fish 

 predominated, but the actual and proportional fig'ores for each cruise and 

 for each branch are given in the following table. 



/A table of participating personnel, a Summary Table of the Results of 

 Operations (see Table 4., colunn 1), and a Table of the Results of Operations 

 by Cruises (see Table 5) have been omitted at this point. After the 

 "Table of the -eights of Albacore Taken at "iach Station" a graph showing the 



55 



