218 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



swim with the body upright, as young fish of other families do, and 

 when first hatched the eyes are on opposite sides of the head. At the 

 age of about three months, however, one of the eyes will have moved 

 to the other side of the head, to conform with the change of the 

 body in swimming from an upright to a flat position. The position 

 constantly assumed by the very young fry is peculiar, the long axis of 

 the body being vertical, with the head upward. This is owing to a 

 large oil-globule in the anterior part of the yolk-sac. 



The fry are quite hardy and stand transportation very well. They 

 have been kept three weeks without change of water in a bottle hang- 

 ing in a box of running water to maintain an even temperature in the 

 bottle. In planting the fry, which is done in one or two days after 

 hatching, they are put into the transportation cans commonly used for 

 such purposes and taken in a boat to localities in which the brood fish 

 are found. The cans are put overboard and sunk until the mouth is 

 submerged, when the contents are gently turned out. For a trip of not 

 more than two or three hours' duration, with water temperature about 

 38° F., from 400,000 to 500,000 fry may be safely carried in a 10-gallon 

 can. 



