152 



HALSTEAD AND SCHALL 



weighing 15 to 25 grn. Their reactions were observed and recorded for a 

 period of 36 hours. 



The classification used here is an arbitrary one which does give some 

 idea as to the degree of toxicity of a fish species within a particular geo- 

 graphical area. This method makes no attempt to differentiate between 

 virulence and concentration. Moreover, as the interpretation of weakly 

 positive results in terms of human symptomatology is not clearly under- 

 stood yet, the reader is cautioned about arriving at hasty conclusions 

 regarding the results of this study. 



Negatve (N), if the mouse continues to remain asymptomatic dur- 

 ing the maximum test period of 36 hours, or dies after that time. 



Weakly Positive (WP), if the mouse shows definite symptoms, 

 such as lacrimation, diarrhea, ruffling of the hair, hypoactivity, ataxia, 

 etc., but the animal recovers. 



Moderately Positive (MP), if the mouse develops hypoactivity, 

 ruffling of the hair, lacrimation, diarrhea, paralysis, etc., and dies luithin 

 a period of 1 to 36 hours. 



Strongly Positive (SP), if the mouse develops hypoactivity, ataxia 

 and paralysis, usually followed by clonic or tonic convulsions of varying 

 degrees, paradoxical respiration, respiratory paralysis and death occurs 

 within a few seconds to one hour. 



TABLE I 



An Analysis of Galapagos Islands Fishes 

 With Reference to Their Toxicity 



Extract No. Family, Species, and Vernacular Names 



ACANTHURIDAE— Surgeonfish 



R144-1,2,3,4 A canthurus crestonis (Jordan and Starks) 

 R209-l,2,3,4 II M II " II 



Field No. Part of Fish Results 



R99-l,5 

 R192-1,2,5 



R249-l,3,5 

 R308-l,2,4 

 R336-l,2,4 

 R351-l,2,3,4 



Xesurus punctatus (Gill) 

 II II II 



