Table 4. --Summary of results obtained with nehu and tilapia in 

 fourteen days of sea tests 



u 



4/ 



Several schools were chumnned employing both bait species. 



Schools from which fish were caught using each bait. 



Includes only the time on schools from which some fish were caught. 



Based on the total amount of bait used on all schools chummed regardless 



of catch. 



fish may not be a detrimental factor when fishing 

 a fast-, hard-biting school which gives the bait 

 little opportunity to sound. Another feature 

 favoring the smaller tilapia is the weak devel- 

 opment of the spines in the dorsal and anal fins. 

 In the larger fish these spines are sufficiently 

 well developed to cause some injury to the 

 chummer's hands if he "squeezes" the bait to 

 lessen its activity. 



z 

 < 

 ■s. 

 a. 



UJ 



I 



IS) 



MOSTLY 

 NEHU TILAPIA 



i. .. 1 



1 r 



MARLIN 



T-27-56 



SCHOOL •! 



TOTAL CATCH 165 



TILAPIA 



ORION 



6-26-56 



SCHOOL'7 



TOTAL CATCH 140 



NEHU 



NEHU a TILAPIA 



TILAPIA 



10 20 30 40 50 



TIME ON SCHOOL, MINUTES 



Figure 4. --The results of skipjack fishing on 

 the Orion, June 26, 1956, using both nehu 

 and tilapia as bait. 



Figure 5. --Variations in catch rate when using 

 nehu and tilapia to chum a slow-biting 

 school {upper panel) and a fast-biting school 

 (lower panel). 



