CONTENTS. 



rage. 



I Methods 1113 



General principles in field study of fishes 1113 



Habituation of fish to observer '113 



Determination of species 1116 



Analysis of observations 1116 



Repetition of observations 1117 



Importance of field experimentation iit? 



Making of records 1117 



Compilation of observations 1118 



Times and places of observation 1118 



Means and devices for observation 11 19 



Note-taking materials 1119 



Field glasses 1120 



Water glasses 1120 



Photographic methods 1122 



II. Illustrative example 1125 



Breeding habits of the horned dace 11 25 



Observing the fish at nest-building time 11 25 



The nest-building process 1127 



Protection of the nest against other fishes 1128 



Spawning behavior of male and female 11 29 



Security of nest structure 1132 



Destructive agencies 1133 



Summary of observations 1134 



Literature cited II 35 



1112 



