CAT-FISH CULTUEE 61 



fish at that time contract fungus more readily 

 than some scaled fishes. 



White and Yellow Cat-fishes. The white and 

 yellow cat-fishes, when transplanted from rivers 

 like the Delaware and the Hudson into interior 

 waters in the same latitude, develop a flavour 

 excelled by very few species. The yellow one 

 takes very kindly to being transferred from its 

 native environment, and land-locked, while the 

 white cat-fish accommodates itself to changes 

 nearly as well. Hence the culture of both these 

 species can be profitably carried on for market 

 purposes in towns removed some distance from 

 sea-port cities, since the prices for them in city 

 markets are very encouraging. 



One man in Pennsylvania had a number of arti- 

 ficial ponds, each covering a considerable area of 

 ground. One or more of them had formerly been 

 mill-dams. At a certain period of the year he drew 

 down the water, thinned out his stock of young bull- 

 heads by netting them out and throwing away the 

 smallest, returning to the water only the largest and 

 best appearing, as he said that unless such thinning 

 took place the entire stock would be stunted and their 

 market value depreciated. 



The Commonwealth of Pennsylvania has for sev- 



