Effect of Sea on Different 

 Kinds of Bait 



□ SHALLOW (HOOKS 18 6) 

 ^ INTERMEDIATE (HOOKS 2 a 5) 

 DEEP (HOOKS 3 8 4) 



The presence of unaccounted 

 factorls) affecting the bait returns 

 In the preference experiments was Indi- 

 cated by the significant Interaction 

 chl-squares (tables 11, 12, and 15). 

 Table 18 presents the bait returns for 

 the sar'dlne vs. squid experiment tabu- 

 lated by sea condition. The analysis 

 of variance shows significant differ- 

 ences with kind of belt and a signifi- 

 cant Interaction between baits under 

 different sea conditions. From the 

 bait return means given In table 18 

 the interaction can now be attributed 

 to the combination of the relatively 

 stable squid returns i-egerdlesa of the 

 sea intensity and a pre dpi tous decrease 

 in sardine bait returns with increasing 

 seas. This is consistent with the 

 physical characteristics of the two 

 baits. The tough, fibrous squid are 

 not likely to work free, while the more 

 delicate sardine can easily work off 

 the hook. 



The results of the rearranged 

 data for catches made with sardine and 

 squid as given in table 19 present a 

 peculiar situation. The chl-square 

 analysis of catches made In 1 and 2 

 seas was non-significant In all respects. In the analysis of catch for sea inten- 

 sities greater than 2, the difference in catch by the two baits was significant 

 (pooled x2 : 4.79, P<0.05) with 123 fish caught with sardine baits of a total 

 catch of 214 fish. This then, means a significant increase in the catch on sardine 

 as compared to squid with increasing sea intensity, even though it appears that 

 sardines do not stay on the hook as well in higher seas. No explanation is advanced 

 at this time except to suggest a possible change in the relative attractiveness of 

 the two baits with increasing seas. This could be the result of the silvery sar- 

 dine's being visible for a relatively greater distance when moved up and down in 

 a rough sea. 



I 2 3 >4 



SEA INTENSITY (HYDROGRAPHIC OFFICE CODE) 



Figure 6. --Sardine bait return by 



relative hook depth, Hugh 

 M. Smith cruise 11 and 

 John R."~Manning cruise 11. 



Table 17. 



-Sea conditions (Hydrographlc 

 Office code) 



19 



