ILLUSIRAIIONS 



Figure Page 



lo Concrete tank in -v^iich yellowfin and tuimy 7/ere confined, oo 3 



2» Plan of the concrete tank in which the tuna used for 



experiments in chemoreception were kept„ ., . , . o o ,000000000 10 



3o Graphs illustrating the reaction of one yellowfin to 



baitfish water introduced at A., and at G^ and to seawater 



Uo Graphs illustrating the reaction of tv/o yellowfin to 



"clear" and- "murky" extracts of baitfisho o « o o » »» >, o o » » o » » 15 



5o Graphs illustrating the reaction of two yellowfin to 



Preparation A (squid extract plus octopus ink) and of 

 two yellowfin and one tunny to Preparation B (squid 



65 Graphs illustrating the reaction of two yellowfin and 



five tunny to "whole" preparation of skipjack flesh,, 00000 19 



7„ Graphs illustrating the reaction of two yellowfin and 



five tunny to "clear" and "murky" portions of skipjack 



X XSSil P rSpdJ/S. uXOn COOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO ^\J 



80 Graphs illustrating the reaction of one yellowfin and five 

 tunny to "protein" and "fat" fractions of clear extract 



of yellowfin flesh preparationo , , , , <> » <> o o o » o ,. o , » o o o , . . » » o 22 



9o Graphs illustrating the reaction of one yellowfin to 

 "protein" and "fat" fractions of clear extract of 



yellowfin flesh preparationo co^ 00 0000.. 0,000000000000000000 2h 



10 o Graphs illustrating the reaction of five tunny to "protein" 

 and "fat" fractions of clear extract of yellowfin flesh 



Pir'6p3X'3l1il.OIlo oo»oooooooooooooooao 0000000000000000000000000 ^p 



11 o Graphs illustrating the reaction of one yellowfin to 



increasing concentrations (1 to h) of "whole" yellowfin 



flesh preparationo 000,000,, 0,0,00000^,0^-0, ,00 « 00000,00000,0 <:o 



12 o Graphs illustrating the reaction of five tunny to 



increasing concentrations (1 to U) of "whole" yellowfin 

 flesh preparationo ,000,0,0,0000000000,0,00,0000,0,00000000 



13, Graphs illustrating the reaction of on© yellowfin to 



"whole" mar lin flesh preparationo ., , » o <, o o , o o » , .» o o , , o , , o 



2? 

 29 



