30 



Pigiire 10. — A battery of jars for 

 hatching sucker eggs. 



Minnesota Conservation Department 



flow of water is maintained through the jar. While the eggs may 

 be handled on trays, far better results will be attained by the 

 use of Meehan hatching jars, such as are in universal use for 

 handling pike and whitefish eggs (fig. 10). 



Best operation of the battery is obtained by 

 placing not more than two quarts or 100,000 sucker eggs 

 in each jar. After hatching, the fry will remain in 

 the jars for several days before they are free-swimming 

 and can go out through the overflow. A higher percent- 

 age of survival can be expected if the fry are removed 

 from the jars and placed in clean tanks of metal or 

 concrete. The perforated metal baskets which are used 

 for trout fry are often used to hold sucker fry until 

 they are free-swimming. 



STOCKING THE POND WITH FRY 



Stream fishes such as the sucker, creek chub, and 

 oommon shiner are usually stocked as fry. By this 

 method the young fish do not have to compete with the 

 adults for food and are not preyed upon by the adults. 



The rate of fry planting varies with the type of 

 feeding employed in the pond and with the age of the 

 introduced fry. Fertilized ponds and those where 

 "artificial feeding is practiced can support a larger 

 population of fishes than natural ponds and should be 

 stocked at a heavier rate. As the level of mortality 

 is higher for eyed eggs than for advanced fry, eggs 



