REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



101 



in all respects, similarly conditioned except that it supported no young 

 fishes. In the latter the pelagic life was abundant. It was evident 

 that the swarm of young fry used up the supply of pelagic food as 

 fast as it came into the car. 



The following table gives the daily average length of specimens of 

 Menidia in this second experiment: 



Mm. 



July 27 4.52 



July 28 4.91 



July 29 5.04 



July 30 6.06 



July 31 5.51 



August 1 6 . 57 



August 2 7.58 



Mm. 



August 3 7 . 76 



August 4 8 . 72 



August 5 9 . 00 



August 6 9 . 98 



August 7 9 . 82 



August 8 10.02 



August 9 9 . 25 



Mm. 



August 10 10.04 



August 11 10.34 



August 12 10.12 



August 13 10.74 



August 14 10.21 



August 15 11.72 



August 17 10 . 26 



The regular measurements were discontinued after this date. On 

 September 8 the average measurement was 14.83 millimeters and on 

 September 14, 14.45 millimeters. In all of these measurements 

 different groups of individuals were caught up, and the averages, 

 therefore, seem to show a decrease in size rather than an increase 

 when there is not considerable rapidity of growth. 



A few eggs of Fundulus heteroclitus were fertilized on July 27 and 

 were placed in the original filter car. They were floated near the 

 surface in a shallow bag of netting somewhat similar to that de- 

 scribed in the case of Menidia. The eggs hatched on August 5 and 6 

 and the fry all lived in healthy condition until they were taken out 

 at intervals and preserved. The daily averages of length for the 

 first ten days are as follows: 



Mm. 



Augusts 4.92 



August 6 5.07 



August 7 5 . 40 



Augusts 5.35 



Mm. 



August 9 5.56 



August 10 5.37 



August 11 5.88 



August 12 5.92 



Mm 



August 13 5.98 



August 14 6.25 



August 15 6.30 



Specimens of this lot have continued to live in one of the cars until 

 the date of writing (September 19). 



On July 17, 56 young toadfish, measuring from 15 to 17 milli- 

 meters, which had been raised from the eggs in a small car, were 



