102 



REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



transferred to the original filter car. At more or less irregular inter- 

 vals during the next four or five weeks, specimens were taken out and 

 measured. The following table of individual and average measure- 

 ments indicates the rate of their growth:* 



Mm. 



July 17 (56 specimens).. . . 15.0-17.0 



July 30 19.0 



July 31 22.5 



August 1 18.7-22.0 



Mm. 



August 11 26.0 



August 14 26.5 



August 21 fl'J • 0-33 . 7 



In order to test these cars with as many kinds of fishes as possible,. 

 we introduced the young of some other species in lieu of fish eggs, which 

 could not be obtained in great variety at this season of the year. On 

 July 17, a lot of pipefish taken from the brood pouch of a male were 

 put directly into the original filter car. The individuals appeared to 

 be of practically equal length and measured 10 millimeters. They 

 apparently all lived and, like the other specimens in the cars, con- 

 tinued to thrive, showing no sign of disease, until they were taken out^ 

 on August 21, 



The following data show the rate of growth as indicated by the 

 average sizes at the end of irregular periods. No food was given to 

 them except that which came in with the water by means of the 

 chain of buckets. 



Mm. 



July 17 10.0 



July 18 11.4 



July 20 21.8 



July 23 24 . 5 



July 25 27 . 5 



July 27 26 . 5 



Mm. 



July 30 44.0 



July 31 46.1 



August 2 52.6 



August 6 61.6 



August 8 58 . 6 



August 11 67.4 



Mm. 



August 15 67.2 



August 20 69.4 



Septembers t71.3. 



September 14 |70.0 



On August 21 the remaining specimens were transferred to another 

 filter car with canvas lining, where they remained alive and well up 

 to September 19. 



On July 21 another pipefish was caught with a brood pouch full of 

 young which measured 10 millimeters. These young were placed, to- 



* 1 am indebted for these measurements to Mr. H. C. Tracy. 



t Average, 30.21 mm. Fifty-four specimens out of 56 put into the car were recovered. 



J Measuiements taken after transference to new car. 



