Page 



11. Average size (kg.) of skipjack tuna caught in 20-minute areas of lon- 

 gitude and latitude by seven Hawaiian skipjack tuna fishing vessels, 

 June-August 1967. Areas in which skipjack averaged 7 kg. or less 



are shaded 16 



12. Ratio of the number of schools successfully fished (upper figure) to 

 the number of schools sighted (lower figure), by 20-minute areas of 

 longitude and latitude in Hawaiian waters, June-August 1967 17 



13. Frequencies of school sightings and schools with catches, by time of 

 day for seven Hawaiian skipjack tuna fishing vessels, June-August 



1967 18 



14. Relation between catch per trip and average number of schools fished 

 and average catch per school by seven Hawaiian skipjack tuna fishing 

 vessels, June-August 1967 24 



TABLES 



1. Number of days or nights baited, catches, mortalities and releases, 

 time spent baiting, and catch rates in baiting grounds fished by seven 

 Hawaiian skipjack tuna vessels, June-August 1967 



Number and percentage of trips tabulated by time the vessels depart- 

 ed, started and ended scouting, and returned to port, Hawaii, June- 

 August 1967 



Average number of schools sighted, chummed, and fished; average 

 time spent pursuing, chumming, and fishing the schools; average 

 amount of bait used per trip and per school; average number of men 

 fishing; and catch per trip, per bucket of bait used, and per school for 

 seven Hawaiian skipjack tuna vessels, June-August 1967 



Number, percentage, and cumulative percentage of trips of seven Ha- 

 waiian skipjack tuna fishing vessels, tabulated by numbers of schools 

 sighted, chummed, and successfully fished per trip, June-August 1967 

 (excludes August data for vessel F) 



5. Number , percentage, and cumulative percentage frequencies of schools 

 pursued and chummed by seven Hawaiian skipjack tuna fishing ves- 

 sels, tabulated by pursuit and chumming time in 5-minute intervals, 

 June-August 1967 9 



6. Number and percentage of 653 schools not fished by the seven Hawai- 

 ian skipjack tuna fishing vessels, tabulated by their reasons for aban- 

 doning the schools, June-August 1967 10 



7. Number of schools with and without catches, and averages of catch 

 per school, number of men fishing per school, fishing duration per 

 school, and size of fish per school, tabulated by the amount of bait 

 used per school by seven Hawaiian skipjack tuna vessels, June- 

 August 1967 11 



8. The correlation coefficients calculated for the relation between bait 

 used, men fishing, fishing duration, and fish size and the averages 

 per school of the number and weight of fish caught, amount of bait 

 used, men fishing, fishing duration, and fish size. A single asterisk 

 denotes probabilities between 0.05 and 0.01; two asterisks denote 

 probabilities equal to or less than 0.01 12 



9. Number of schools and averages of catch per school, amount of bait 

 used per school, fishing duration, and fish size, tabulated by the num- 

 ber of men fishing per school on seven Hawaiian skipjack tuna ves- 

 sels, June-August 1967 — _ 13 



i V 



