164 American Fisheries Society 



in the appearance of eggs of good and poor quality, and only- 

 after working some time in the jars will the difference be apparent. 



With a water temperature of 45 degrees, the eggs will show 

 little development and remain nearly dormant. At a temperature 

 of 58 degrees they will hatch in from 4 to 4^" days, while at 68 

 degrees hatching will take place in about 30 hours. 



As the fry are so very small, nothing but good quality nainsook 

 or silk is suitable for screening the collecting tanks. It is advisable 

 to ship all fish from each tank at least every other day, if possible, 

 so that all cast off shells may be removed and the tank and screen 

 thoroughly cleaned to prevent overflowing. 



From various experiments it has been determined that both 

 green and eyed eggs may best be shipped in the ordinary 10 gallon 

 transportation can. Four quarts of eggs may safely be placed 

 in each can, and if the trip be one of but two or three hours, and 

 the air temperature moderate, no messenger will be needed. For 

 longer shipments, however, an attendant will be necessary to 

 aerate the water and regulate the temperature. 



It is not advisable to pour the water directly from the dipper 

 into the can, as in aerating the water for fingerling fish. It should 

 be transferred to a pail by means of a screened siphon, thoroughly 

 aerated in the pail and gently returned to the can. The water 

 in the can is then given sufficient motion, by means of the dipper 

 or hand, to lift the eggs from the bottom and cause them to 

 separate freely in the re-aerated water. 



Placing ice in the can to reduce the temperature is also to be 

 avoided. Cooling should be accomplished by placing a small 

 quantity of ice in the pail while aerating or placing ice on the 

 shoulder of the can or in the can cover, if the covers are adapted 

 for holding ice. A sudden drop in water temperature, if more 

 than 4 or 5 degrees, is injurious, and it is preferable to have a 

 few degrees rise in temperature than to lower it during trans- 

 portation. 



Two lots of eggs were packed in smelt cases, under the same 

 general plan as is used in packing trout and pike perch eggs, 

 and appeared normal when removed from the case, after a period 

 of 3 days, but after working for a day or two in the jars, both 

 lots turned bad and not a single egg hatched. It is believed 



