ILLUSTRATIONS 



Figure Page 



o 

 1. Temperature ( C„), chlorinitv (p„ po m,, )(, and 



mortality (number of fish dying) in Pond NOc 5 



over the period from September 1^ 1952 to 



June 30, 1953 6 



Ze Diagram of the concrete tank showing the arrange- 

 ment for introducing the test materialSj the 

 attraction area^ and the obse rvation booth o 8 



3o Number of passes and time (seconds) out of 



successive 2-minute periods for three tank 

 experiments - NoSo 57, 58^ and 59 c 10 



4. Diagram of Pond NOo 5 showing the arrangement 

 for introducing test materials ^ the attraction 

 area, and the observation tower. ...„ 12 



5„ Number of passes and time (seconds) out of 

 successive 3-minute periods in six pond 

 experiments - Nos, 136 to 141, inclusive 14 



6o Number of passes and time (seconds) out of 



successive S^tninute periods in seven pond 

 experiments - NoSo 94 to 100, inclusive^ 20 



7o Time (seconds) out of successive 3-minute periods 

 in pond experiment NOo 112^ in which a 

 gradient of stock extract of skipjack flesh was 

 established for 48 minutes o . 31 



Bo Fractionation of stock extract of skipjack flesh: 

 procedure euid results in experiments No8„ 83 

 to 86, and 88 40 



9o Fractionation of an alcohol extract of skipjack 

 flesh? procedure and results in experiments 

 Nos. 178, 179, 181, and 182 44 



lOo Fractionation of aji alcohol extract of skipjack 

 fleshs procedure and results in expe riments 

 Nosc200 to 202, and 204 to 206 45 



11. Fractionation of alcohol extracts of skipjack flesh: 

 procedure and results in experiments NoSa 215, 

 216, 218p and 223 to 225 47 



