484 



PARENTAL CARE AMONG FRESH-WATER FISHES. 



Its subsequent movements, its subdivisions, and the frequent returns 

 to the point B, where, without much doubt, either the school or the 

 male had been for some time previously, and its final reunion with 

 the male when, after fifteen minutes, he i-eturned to the point C, may 

 all be followed in the figure. These larva^ were about 20 millimeters 

 long. The rate at which the schools move increases greatly with the 

 age of the larva^ and doubtless also at any age with the conditions, 

 such as abundance of food. In a school of larva^ of about 20 milli- 

 meters " Reighard " noted a rate of about 16 meters per hour. In 



Fig. 23. 



-Diagram of movements of 2(>-mm. larval 

 Reishard. 



P.owflns diirint; 15 miniitr 



After 



another case " he " found a school of larvae of about the same size 

 within 5 meters of the sj^ot on which it was five hours earlier, another 

 wnthin 12 meters of its original location, and. another within 30 

 meters." 



By the middle of June, '" when the larva? are some 90 to 100 milli- 

 meters (about 4 inches) long, the schools are much spread out, -con- 

 sist of few individuals, and are moving with great rapidity." The 

 male still continues with them. But l)y high summer all the swarms 

 have broken up and the young dispersed to lead independent lives. 



