Table 4. --Albacore troll catch, charter vessels (cont'd) 



- Consult the Standard Time Chart of the World (HO 5192) of the U. S. Hydrographic Office for 

 zone boundaries. 



Table 5. --Troll catch cind number 

 of albacore tuna tagged by Honolulu 

 Biological Laboratory and charter 

 vessels 



Gill-net Fishing 



Eighteen shackles of gill nets with meshes 

 varying from 4 1/2 to 7 1/2 inches, stretched 

 measure, were fished by the Manning. An in- 

 dividual set consisted of a 7 1/2-inch mesh 

 shackle placed at each end of the set and adjoin- 



ing one of these was a 4 1/2-inch mesh shackle; 

 and eight 5 1/2-inch mesh and seven 6 1/2-inch 

 mesh shackles were alternated in the center of 

 the set. Construction details of the nets are 

 given by Graham and Mann (MS)— . 



Sets were usually made at dusk and re- 

 trieved at dawn. One 24-hour station was com- 

 pleted in an area of abundance off Point Arena 

 immediately following an overnight set in which 

 42 albacore were captured (fig. 2). The 18- 

 shackle set was halved for this operation and 

 five baskets of longline, described below, were 

 attached to an end of each half. Four 6 -hour 

 consecutive sets were made, alternating the 

 two halves, between the hours of 1500 on July 30 

 and 1531 on July 31. 



Gill-net catches made during the cruise 

 are given in tables 6 and 7; the lengths of the 

 albacore caught are listed in table 8. A list of 

 the common names of fishes appearing in these 

 tables and other portions of this report is pre- 

 sented in table 9 along with the corresponding 

 scientific names. 



3/ 



— Graham, J. J. and H. J. Mann. MS. 



Construction and catch selectivity of albacore 



gill nets in the central North Pacific. Biological 



Laboratory, Honolulu. 



15 



