746 BULLETIN OF THE BUREAU OF FISHERIES. 



other eggs, they are very sensitive to such exposure. Half-barrel fish kegs or 

 kits with one end knocked out and iron handles attached make very good and 

 economical vessels in which to transport pike perch eggs. It is customary to 

 insert a wire-cloth drain in the top of the kit on one side and the kits are 

 asphalted inside. Canvas is thrown over the top to serve as a cover. When 

 the eggs are held over night in these kits it is expected to supply them with 

 running water whenever possible to do so; otherwise the water must be period- 

 ically renewed or aerated. At some of the field stations a pipe arranged with 

 pet cocks and rubber tubing for supplying water to a number of kits or trans- 

 portation cans saves much labor in the matter of aerating eggs which must be 

 held for a day or more. 



Pike perch eggs collected at a distance from the hatchery are conveyed 

 thereto in the usual transportation case on trays, a small amount of ice being 

 placed on the top tray, which is substituted for the usual ice hopper; an inch 

 space around the sides of the stack is also filled with ice. Ice over the stack 

 must be used sparingly or the green eggs may be injured by the cold water 

 where it trickles upon them. For large shipments it is customary to have a 

 caretaker accompany the packages to regulate the temperature, etc., the use 

 of moss on the trays as well as the insulation material then being omitted. 



Since eyed pike perch eggs are usually shipped during the month of May, 

 for safety ice is used around the stack of trays as well as in the hopper, even 

 on a two days' journey. 



Whitefish eggs are transported from the field of collection by both of the 

 methods employed in the transfer of pike perch eggs, although they do not 

 require quite so much attention. Eyed whitefish eggs are packed on trays in 

 the ordinary way. 



The fields for the collection of lake trout eggs being widely distributed, it 

 sometimes happens that green eggs are held in transportation cases for several 

 days before their arrival at the hatchery. They carry as well laid directly on 

 the wire-cloth bottoms as on a layer of cheese cloth. No packing is necessary 

 if they are in the care of an attendant, since the latter can regulate the temper- 

 ature by the use of ice and with water of the proper temperature, the trays 

 being removed and sprinkled at least once in twenty-four hours. 



In packing lake trout eggs for short distances, say up to a thousand miles, 

 the ice hopper is omitted. Mosquito netting and moss are put on in the usual 

 manner and the top of the moss is slightly frosted before the trays are stacked 

 on the baseboard. A light piece of lumber is used in place of the ice hopper 

 and fine shavings are solidly packed under, above, and on all sides of the stack 

 of trays. For the longer shipments the ordinary ice hopper is used, fine shav- 

 ings being placed around the stack of trays for insulation. 



