FISH-CULTURAL PRACTICES IN THE BUREAU OF FISHERIES. 



745 



J/ayo 



i/rr'ltfffS 



purpose they are laid in cheese cloth on wire-bottom trays, between wooden 

 frames also covered with wire cloth, strapped together, and shipped without 

 further packing. 



Experiments at Havre de Grace, Md., seem to demonstrate that it is prac- 

 ticable to pack eggs of the white perch in the ordinary trout egg case with ice 

 hopper and ship them on journeys of thirty-six hours' duration without apparent 

 injury. Two lots of green eggs taken at a temperature of 56° and 70°, respec- 

 tively, and held in trout egg cases for twenty-four to twenty-six hours, hatched 

 as well as eggs placed directly in the hatching jars. In the first experiment 

 there was no change in temperature, but in the second experiment there was 

 a fall from 70° to 64°. White perch eggs to the number of 3,000,000 have 

 in several instances been w^'*" 



shipped by express from 

 Havre de Grace, Md., to 

 Washington, D. C, a half 

 day's travel, in four McDon- 

 ald jars packed in sawdust, 

 ice being used in the packing 

 when the air temperature 

 seemed to require. The 

 jars were equipped with 

 the usual glass tubes, which 

 extended above the packing, 

 but whether this provision 

 for aeration was necessary 

 has not been tested. To in- 

 sure proper aeration, how- 

 ever, it would seem advis- 

 able, with present knowl- 

 edge of the subject, not to ship large numbers of white perch eggs in 

 water for travel of four or more hours without a caretaker. 



Attempts to transport yellow perch eggs on trays have not given satisfac- 

 tory results, but it is apparently possible to carry them successfully almost any 

 reasonable distance in the ordinary transportation cans, i to 2 gallons of eggs 

 to 8 gallons of water, the proportion varying with the distance to be traveled, 

 and care being taken to aerate and temper the water. 



Green pike perch eggs may be carried from near-l^y collecting grounds to 

 the hatchery in tubs or transportation cans, care being taken to renew the 

 water frequently, to keep it well aerated, and of a proper temperature. Ice 

 must be prevented from coming in contact with the eggs, because, unlike most 



B. B. K. !9oS— Pt 2—5 



Fig, 9. 



-Atkins-Diusmore shipping case. 



Cross section. 



